Indonesia Conference Directory

Corresponding Author
Irwanto Irwanto

Institutions
Department of Electrical Engineering Vocational Education, UNTIRTA, Indonesia

Abstract
Information needs for ones color perception are needed in the fields of medicine, engineering, astronomy, biomedicine and so on. The demand for accurate assessment of color perception must be met by the perception detection tool used. Ishiharas test, as a perception detection tool that is still used today has insufficient accuracy. This research aims to create a system that can detect a shift in ones color perception, relative to the average color perception of a number of respondents. Through plotting the respondents perception points, in the CIE coordinate system (Commission International de IEclairage) XYZ can be calculated the average euclidean distance, ED, relative to the reference point and the distribution of x and y groups of perception points around the point of reference. Both size, euclidean distance and distribution are used as indicators of average color perception so that an assessment of ones color perception is given based on the results of comparison between color perception points and color perception indicators. The tool used to do the test is Delphi version 7.0 software. the research material used is the RGB (Red, Green, Blue) color image format. The results of a persons color perception study are divided into three levels, namely: (1) "normal" assessment if euclidean (ED) perceptions are smaller than the euclidean (ED) average (2) the "somewhat normal" assessment if the distribution of x and y is smaller rather than the color of perception and the distribution of x and y (3) the assessment is "abnormal" if the color of perception is greater than the max distribution of x and y. A new perception point assessment that is in level one is used to up-date prevailing perception indicators. Up-dating condition constraints affect the quality of the threshold average perception specifically and the quality of the results of the perception detection system in general.

Keywords
Colour Perception, Spectral Characterictics, Detection Model

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/vWQzeBZdN9CL

Corresponding Author
Yuningtyas Nely Kusuma Dewi

Institutions
a) Department of Physics, Faculty of Sains, Institute of Technology Sepuluh Nopember
Raya ITS Street, Keputih, Surabaya 60111
*yoyok[at]physics.its.ac.id

Abstract
This study aims to determine the effect of annealing temperature on the barium titanate (BaTiO3) films as a solar cell material. The synthesis of BaTiO3 uses barium hydroxide (Ba(OH)2) and titanium dioxide (TiO2) as the base material. The results of the deposition of BaTiO3 films were annealed with temperature variations of 400oC, 500oC, and 600oC with a holding time of 1 hour respectively. Characterization was carried out using X-Ray Diffraction (XRD) to determine the microstructure of the films, test the optical properties of the films with UV-Visible and Fourier Transform Infrared Spectroscopy (FTIR) to analyze chemical bonds between molecules and particle size was calculated using the Scherrer formula. The analysis showed a decrease in the energy gap and absorption for the higher annealing temperature. Variations in annealing temperature cause changes in microstructure, crystal size, and the degree of crystallinity that affect the energy gap and the absorption of BaTiO3 films.

Keywords
barium titanate, temperature annealing, energy gap, absorption, microstructure, crystal size, crystallinity

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/cHRyt4WfjK2Q

Corresponding Author
Ganesha Antarnusa

Institutions
1 Department of Physics Education, Universitas Sultang Ageng Tirtayasa, Indonesia
2 Department of Physics, Universitas Gadjah Mada, Yogyakarta, Indonesia

Abstract
In this paper a potential use of giant magnetoresistance (GMR) sensors in Wheatstone bridge is presented in order to detect polyethylene glycol (PEG)-coated magnetite (Fe3O4) nanoparticles as biomolecular labels (nano-tags) in magneto-biodetection technology. The GMR Co/Cu multilayer structures were fabricated by DC magnetron sputtering method. The magnetoresistance (MR) of Co/Cu was 2.7%. The Fe3O4 were synthesized via co-precipitation method, exhibiting a soft magnetic behavior with saturation magnetization (M_s) of 77.2 emu/gram and coercivity (H_c) of 49 Oe respectively. X-ray diffraction (XRD) patterns and transmission electron microscopy (TEM) images showed that Fe3O4 was well crystallized and confirmed the formation of inverse spinel structure with an average size of around 12 nm. Formation of PEG/Fe3O4 was confirmed by Fourier transform infrared spectroscopy (FTIR). As the PEG concentration is decreased the overall saturation magnetization of the coated nanoparticles initially decreases due to the decrease iron content with a minimum of 37.2 emu/gram for nanoparticles with the smallest Fe3O4 content. Various applied magnetic fields of 0-650 Gauss have been performed using electromagnetic with the various currents of 0-5 A. The final value of the output voltage signals for the Fe3O4 is 1.76 mV. The output voltage changes with the increase of concentration of PEG. The developed sensors are used to monitor real-time binding signals and portable into a Wheatstone bridge for the magneto-biodetection at ultra-low concentration using magnetic nanoparticles coated with PEG as reporters.

Keywords
giant magnetoresistance; Wheatstone bridge; Fe3O4; magneto-biodetection

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/rXdCmETxvLG9

Corresponding Author
Ajeng Eliyana

Institutions
(a) Department of Physics, Physics of Electronic Materials Research Division, PECVD Lab, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40312, Indonesia
(b) Department of Physics, Physics of Material Lab, State University of Makassar, Jl. AP.Pettarani, Makassar 90222, Indonesia

Abstract
Currently carbon nanotubes (CNT) are one of the interesting topics of nanotechnology in the research world. One application is the solar cell which is of concern to photovoltaic researchers, because of the uniqueness of its characterization, namely its wide optical absorption, low resistance and high charge-carrying mobility. In addition CNT has a very large electrical conductivity making it easier to conduct electricity, because it has the potential to increase the efficiency of thin film solar cells. One of the optimization of CNT growth has been done on the growth of metal nanocatalysts or metal catalysts, because it plays an important role in the process of forming CNT tubes. In this research, a preliminary study of CNT thin film deposition was carried out by growing a Nickel (Ni) metal catalyst on a SiO2 glass substrate by evaporation method for 25 seconds and annealing process with temperature variations of 400 0C, 500 0C, and 600 0C for 4 hours. Morphological characterization of Ni metal catalysts using Scanning Electron Microscope (SEM). Metal catalysts are obtained in the form of grains (clusters) that are not homogeneous and still close between one grain to another. The distribution of grain in samples with an annealing 400 0C has an average diameter of 89.2 nm, while the distribution of grain at annealing temperature of 600 0C has an average diameter of 201 nm. The diamater obtained is greater, because the addition of annealing temperature causes the thermal vibrational energy to be larger which allows small grains to disappear and merge with large grains so that the size of the grains gets bigger.

Keywords
Metal catalyst, Nickel, evaporation, SEM, CNT

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/cCbpXUNBDuTM

Corresponding Author
M Tommy Hasan Abadi

Institutions
(a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
(b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
*Corresponding author’s email: nandang.mufti.fmipa[at]um.ac.id

Abstract
One of third generation solar cell that can produce high efficiency with strong absorption power is perovskite. The good efficiency of perovskite depend on the stability structure and morphology homogenous. Recently, perovskite with CH3NH3PbI3 inorganic-organic compounds appear as solar cell that perform well even with small active regions. In this study, CH3NH3PbI3 perovskite was synthesized by two step deposition. The disadvantage of this method is that lead iodide (PbI2) material which is only dissolved in DMF solvents has not succeeded in forming perovskite CH3NH3PbI3 so that it has an impact on the performance of solar cells. The addition of DMSO as PbI2 solvent by controlling the composition of DMF/DMSO increased the homogenity of the morphology of perovskite solar cell and the efficiency obtained was better than using DMF solvents only. Characterization of samples using XRD to determine the perovskite crystal phase and structure, SEM to determine the morphology of the sample, and solar simulators to determine the efficiency of perovskite solar cells.

Keywords
Perovskite Solar Cell; DMSO Solvent; PbI2; CH3NH3PbI3; Morphology

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/39YLj8QGDW6C

Corresponding Author
Agus Jatmiko

Institutions
(1) Department of Materials Engineering, Faculty of Mechanicals and Aerospace Engineering, ITB
(2) Research Center for Nanoscience and Nanotechnology, ITB
(3) Department of Engineering Physics, Faculty of Technological Industry, ITB (*Corresponding author: purwa[at]tf.itb.ac.id)

Abstract
Alzheimer is a disease that slowly destroys memory and cognitive ability. There are 46 million Alzheimer patients around the world and 22 million of them are in Asia. The number of Alzheimer’s patients are expected to increase fourfold in 2050. Magnetic Resonance Imaging (MRI), with contrast agent can be used as early detection of this disease. However, enzyme ligand that used for MRI media contrast is neurotoxic. On the other hand, research on PET contrast agent used dimethylaminobenzyl ligand has not widely studied yet. This contrast agent is a promising alternative of ligand because it will be able to interact with Amyloid protein. The strategy of this research is to design magnetite-based MRI contrast coated with dimethylaminobenzyl-chitosan as its ligand. The modified chitosan showed a new peak at 353 nm in UV-Vis result compared with normal chitosan. This result proved that chitosan was modified by dimethylaminobenzaldehyde. FTIR spectrum of encapsulated nanoparticles indicated strong spectrum of iron oxide and 1,4 disubstituted benzene. XRD analysis shows that the nanoparticle formed is D-Magnetite with crystal size 13 + 4 nm. Lastly TEM image shows dark spheres inside the membrane. While, XRD analysis result showed that the size of dark sphere is 12 + 4 nm, which is in range of crystal size for magnetite. Gyration radius of modified chitosan is 6 nm and very close to the thickness of the membrane. This result proved that the modified chitosan is encapsulating the magnetite.

Keywords
Alzheimer, Amyloid-β, β-sheet, MRI contrast agent, Fe3O4 nanoparticles, modified chitosan

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/hEdGZJ7PnaTp

Corresponding Author
Abdul Rajak

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences,
b) Research Center for Biosciences and Biotechnology, Institute for Research and Community Services,
Institut Teknologi Bandung
Jalan Ganesa 10, Bandung 40132, Indonesia
Corresponding authors:
*krijal[at]fi.itb.ac.id, **miftah[at]fi.itb.ac.id

Abstract
This paper reports on the spinning of nanofiber on the surface of car cabin air filter to enhance its filtration performance. Three car cabin air filters with difference average fiber diameter were used as the samples. Polyacrylonitrille (PAN) nanofiber were deposited on the cabin air filter by electrospinning technique. PAN powder was dissolved with N,N dimethylformamide (DMF) with the concentration of 9 wt.%. The solution properties of PAN nanofiber, including viscosity and surface tension, and the average fiber diameter were characterized. The air filtration performance of cabin air filter before and after nanofiber enhancement were analyzed. The filtration performance, including pressure drop, efficiency and quality factor were measured. From the result, the cabin fiber diameter is strongly influenced the air performance filter.

Keywords
car cabin air filter, performance air filter, nanofibers, electrospinning.

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/RcteMAb2W6yB

Corresponding Author
Ilham Syahidi

Institutions
1 ) Physics Department, Faculty of Mathematic and Science Sebelas Maret University, Surakarta, Indonesia

Corresponding author : *rsuryana[at]staff.uns.ac.id

Abstract
Porous silicon (PSi) has been fabricated using electrochemical anodization method on n-type Si (111) substrate with methanol as an anodizing solution. The ratio of the anodization solution was 1 : 1 for HF and methanol. Platinum was as a cathode while silicon was as an anode. Duration of Anodization time was maintained constant that is 30 min with a variation of current density i.e. 10 mA, 20 mA, 30 mA, 40 mA, and 50 mA. Then the samples were cleaned by boiled H2SO4 and H2O2 with ratio 3:1 and overflow for 5 min. The optical reflectance of the sample was determined using UV-Vis Spectrophotometer and surface morphology was observed using AFM. The reflectance decreased with increasing the current density. AFM images confirmed that pores size and depth increased with increasing the current density. Due to PSi affect reflectance value, it is concluded that PSi can be applied as an anti-reflective material in solar cell devices.

Keywords
Si (111), n-type, electrochemical anodization, reflectance, AFM

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/nLHgdZJDBE8v

Corresponding Author
Asdim Asdim

Institutions
a) Division of Physical Chemistry, Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Jl. W.R Supratman, Kandang Limun 38371 A Bengkulu, Indonesia.
*asdim[at]unib.ac.id
b) Division of Inorganic Chemistry, Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Jl. W.R Supratman, Kandang Limun 38371 A Bengkulu, Indonesia.

Abstract
The green synthesis method of SnO2 nanocrystals have been developed in recent year in view of their potential application as photoelectrode in dye-sensitized solar cells (DSSCs). The effect of the size and morphology of SnO2 nanocrystals on efficiency of DSSCs have been reported. In order to prepare SnO2 nanocrystals with different size and morphology, several synthesis methods have been developed. In this report, the facile green synthesis of SnO2 nanocrystals by hydrothermal method at relatively low temperature using plant extracts in acid and base solution have been carried out. SnO2 nanocrystals as synthesized were characterized by an X-Ray Diffractometer (XRD) and a Scanning Electron Microscope (SEM). The results showed that the all products were phase SnO2 nanocrystals which obviously showed by the XRD pattern. Furthermore, SEM images analysis clearly showed the morphology different of SnO2 nanocrystals synthesized with and without the addition of plant extracts. These results indicated that the properties of SnO2 nanocrystals could be controlled using plant extracts in the solution reaction.

Keywords
SnO2; Nanocrystals; Hydrothermal method

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/Wn6chwaBFxKJ

Corresponding Author
Dui Yanto Rahman

Institutions
Institut Teknologi Bandung

Abstract
Inexpensive solar cell comprising PVA.NaCl polymer electrolyte as hole transport medium and TiO2/graphite composite as photon absorbing materials has been succesfully fabricated. A suspension of TiO2 and graphite was easily deposited on Fluorine Tin Oxide using droplet method followed by heating at 200oC for two hours. PVA.NaCl was used replacing PVA.LiOH as hole trasnport medium. The content of NaCl was varied from 2,4,6,8 and 10 % compared to the content of PVA to achieve the best efficiency. 0.5% efficiency was gained using 6% of NaCl content. Although the efficiency was low, but this type of solar cell is promising to be developed in the future since cheap materials and easy fabrication were used.

Keywords
Titanium dioxide, graphite, efficiency, polymer electrolyte, hole.

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/MuK9hcaDxrUA

Corresponding Author
Hartatiek Hartatiek

Institutions
Department of Physics
Universitas Negeri Malang

Abstract
Polyvinyl alcohol (PVA)/Hydroxyapatite (HAp) composite nanofiber was obtained by electrospinning technique using a PVA polymer solution. Variations in the composition of PVA /HAp composite are (100: 0, 90:10, 85:15, 80:20, 75:25, 70: 30 %v). The PVA/HAp composite nanofiber was analyzed including nanostructure, porosity and tensile strength. The characterization of nanostructures using scanning electron microscopy (SEM) showed that the average diameter in the range of 173-234 nm, porosity in the range of 68-77%. The tensile strength test showed that the strain was in the range of 106.9 - 125.5% and tensile strength in the range of 9.77 - 15.85 MPa. This characteristic of PVA/HAp composite nanofiber can be applied as a scaffold in bone tissue engineering.

Keywords
nanostructure, porosity, tensile strength, polyvinyl alcohol, hydroxyapatite, nanofiber

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/djqvFD8u4baP

Corresponding Author
Erna Hastuti

Institutions
(1)Department of Physics, Universitas Islam Negeri Maulana Malik Ibrahim Malang
Jl. Gajayana 50 Malang, 65144, Indonesia
*erna[at]fis.uin-malang.ac.id

(2)Research Center for Physics, Indonesian Institute for Sciences (LIPI)
Komplek Puspitek Tangerang Selatan, Banten, 15314, Indonesia

Abstract
In this research, a carbonized chicken feather for anode materials was prepared using the pyrolysis method. While the activation process of carbon utilized KOH variations (1M, 3M, and 5M) which was pyrolyzed at 700 oC. In addition, the surface area, crystalline structures, and morphologies of the activated carbonized chicken feather (CFCAs) were investigated by the X-ray diffraction, BET, FTIR, and SEM. Furthermore, their various electrochemical properties in LIBs were also examined, with the chemical activation process decreasing the crystallite size. The activated carbon has a small reduction and oxidation peaks, which attributed to the insertion of Li-ion into the voids in carbon. The results show that activated carbon with KOH 5 M has the highest discharge rate capacity at 445.87 (mAhg-1).

Keywords
activated carbon, chicken feather, chemical activation, batteries, anode battery

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/KeDc7vLCdkVQ

Corresponding Author
Rusman Kosasih

Institutions
Material and Metallurgical Engineering Department, School of Post Graduate Studies, Engineering Faculty, University of Indonesia
Kampus UI Depok, Jawa Barat 16424

Abstract
PVD-PLD process nowadays is used to produce a high quality thin film for superconductor – electric layers – medical application – magnetic layers – and resistant coating. This study is a series of PVD research which is used to find the best solution of coating PVD, so that the damage of the tool steel pin made from SKD 61 - hardness 48 ± 1 HRc can be minimized. The research stage was carried out by making research samples in the form of dummy blocks, which are made from SKD 61, PVD-PLD process with 3 types of coating material (AlCr 50:50 – AlTi1 50:50 – AlTi2 63:37), without Active gas such as N or C. The deposition of thin layer showed a promising result condition in which the element of the target exists by testing the samples using FESEM, SEM, XRF, EDS and Micro Hardness Vickers. The characterization testing was done at Physics Research Centre LIPI and PT XYZ Laboratory. The PLD – NdYAG process, which was done using Wave length 1064 nm, Q – switch delay 180 µs/ 70 mJoule - Vacuum 1.16 ~1.35 Torr - Process time 10 minutes, came out with a surface morphology of Al – Ti – Cr particle with 10 – 20 nm amorphous particles. The hardness of surfaces are 474 mHv – 523 mHv (single layer) and 477 mHv – 501 mHv (multiple layer). All of these materials have the same order of hardness from minimum to maximum for both single layer and multiple layer, which is AlCr – AlTi2 – AlTi1. This result will be a reference for further research activities, such as PLD process optimization, Active N gas application and Substrate heat treatment.

Keywords
PLD process – Coating material – Coating layer – Nanoparticle

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/Qc3wRqzn269r

Corresponding Author
Dhewa Edikresnha

Institutions
a)Departement of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

b)Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

c)Department of Pharmaceutics, School of Pharmacy, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract
Electrospinning was employed to produce composite fibers mat consisting of PVP (polyvinylpyrrolidone)/CA (Cellulose Acetate) and Garlic Extract. The electrospun nanofiber mats for all variations show uniform and beaded free fibers. The average fiber diameter of composite fiber decreased along with the increasing applied voltage. The broad FTIR peak representing the stretching vibrations of O-H in hydroxyl groups of phenols and the sharp peak at 1014 cm-1 is the characteristic peak of garlic extract, which indicates the existence of S=O group and proving the presence of organosulfur compounds such as alliin, allicin dan diallyl disulfide. The characteristic peak shifted to a higher wavenumber after being synthesized into fibers. During the electrospinning process, the condition of cone jet in the tip of the needle was recorded and it was confirmed that when the applied voltage was from 12 to 14 kV there is intermittent squirt of solution indicating that the removal rate of the solution due to the applied voltage is smaller than the feed rate of solution. The concentration of garlic extract in the fibers was also examined and it was found that fibers with larger diameter contained larger concentration of garlic extract.

Keywords
Nanofibers, Polyvinylpyrrolidone, Cellulose Acetate, Garlic Extract, Electrospinning, Composite,

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/jq3T7CPFEGLM

Corresponding Author
Diah Miftahul Aini

Institutions
Biochemistry Research Division, Department of Chemistry, Bandung Institute of Technology
Jalan Ganesa No 10, Bandung 40132, Indonesia
*Corresponding author: rukman[at]chem.itb.ac.id

Abstract
Exopolysaccharide (EPS) is a straight/branched biopolymer consisting of sugar units and their derivatives. This sugar unit consists of glucose, galactose, mannose, N-acetylglucosamine, N-acetyl galactosamine, rhamnose, and fructose. EPS is very interesting biomaterial to be studied because it has many advantages such as nontoxic, water soluble, biodegradable and has many applications. EPS has been widely applied in various industrial fields, such as in the food industry, which is used as an emulsifier in cheese, bread, and milk-based production; while in pharmaceuticals industries, it has been used as a material for drug delivery system; and in bioindustry, it is used for enzyme immobilizer. In this study, EPS-producing halophilic bacteria have been screened from a salty lake Gili Meno Lombok, NTB, Indonesia. This study aims to perform a selection of a potential EPS-producing halophilic bacterium, identify its bacterial species, production of EPS and the application of EPS as a nanomaterial for protein immobilization. The EPS produced by the isolates from the selection above was verified by FTIR and NMR spectroscopy techniques. The results of the structure characterization showed that EPS produced by one Gili Meno bacterial isolate was inulin. This potential inulin producing bacterium closed to Salinivibrio costicola based on its16s rDNA sequence and the result of phylogenetic analysis so that it was named in this study as Salinivibrio costicola GM01. Inulin produced by this bacterium was used as a medium for protein immobilization in the form of nanoparticles. The immobilized protein target was lipase. The efficiency of lipase immobilized on nanoparticles were 81%. The SEM image of lipase-inulin nanoparticles showed spherical morphological shape with the diameter about 218−886 nm according to particle size analyzer (PSA) measurement. The zeta potential of the nanoparticle was about +0.03 mV. The respective lipase activity before and after the immobilization was 0.36 ± 0.010 units/mg and 0.28 ± 0.002 units/mg. These results showed that the inulin-based nanoparticle can provide compatible environment for lipase since its activity can be maintained about 80%.

Keywords
Inulin, nanoparticles, immobilization enzymes, Salinivibrio costicola GM01, halophilic bacteria, Gili Meno Lombok

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/pQ7KPk8erCcB

Corresponding Author
Bagas Pratama

Institutions
1) Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Surakarta, Indonesia
*rsuryana[at]staff.uns.ac.id

Abstract
Porous silicon (PSi) is formed on n-type silicon wafers Si (100) and Si (111) substrates using electrochemical anodization method. Silicon wafers were anodized in HF (40%) dan ethanol (99%) solution with a ratio of 1:1 at a current density of 10 mA/cm2, 20 mA/cm2, 30 mA/cm2, 40 mA/cm2, dan 50 mA/cm2 for 30 minutes. The reflectances of PSi were characterized by UV-Vis spectroscopy and the depth and pore size of PSi were characterized by AFM. The reflectance of PSi on both Si(100) and Si(111) substrates decreased with increasing the current density while AFM images confirmed that the depth and the pore size increased with increasing the current density. It is concluded that PSi could be applied as an anti-reflective surface in solar cell devices. The reflectance of PSi on Si(100) substrate had a value smaller than it is on Si (111) substrate. This indicated that the crystal orientation of (100) can be etched easier than the crystal orientation of (111).

Keywords
Si (100), Si (111), n-type, electrochemical anodization, reflectance, UV-Vis, AFM

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/QZfeEqhUmCVd

Corresponding Author
Altje Latununuwe

Institutions
Department of Physics Education and Laboratory of Physics Education,
Pattimura University

Abstract
Titanium dioxide (TiO2) nanoparticles (NPs) have been successfully synthesized using the green synthesis method, which used peperumia pellucida leaf extract as reducing agent and TiCl3 as precursor. The prepared TiO2 NPs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and ultra violet visible (UV-Vis) spectroscopy. XRD result shows that the NPs are in nature anatase phase at the angles of 2 theta 25.3o, 37.54o, 49.91o, 53.84o and 62.72o corresponding to crystal orientations (101), (004), (200), (105) and (204). Based on SEM image, the sizes of these materials are in the range 20-40 nm. The maximum optical absorbance and calculated band gap energy are around 202 nm and 3.68 eV, respectively.

Keywords
TiO2 nanoparticles, green synthesis, peperumia pellucida, SEM, XRD, UV-vis

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/rLe4zVm8DMyb

Corresponding Author
Kurniati Abidin

Institutions
Department of Physics
Physics of Electronic Material Division
PECVD Lab
Institut Teknologi Bandung
Jl. Ganesha 10, Bandung 40132, West Java. Indonesia
*email: toto[at]fi.itb.ac.id

Abstract
Silver (Ag) nano catalyst has been deposited on SiO2 glass substrate by thermal evaporation method. The layer thickness was about 2.42 nm. The Ag nano catalyst was then annealed at temperature of 4000C with variation of annealing time of 1, 2, 3 and 4 hours. SEM, EDS and FTIR spectroscopy were used to characterize the samples. From the Scanning Electron Microscope (SEM) images showed that diameter size of the nanoparticles were mostly 2.92, 1.69, 0.69 and 0.89 mm, respectively. Energy Dispersive X-Ray (EDX) Spectroscopy revealed that composition of Ag for each sample are 0.26, 0.14, 0.48 and 0.14% respectively. Based on the SEM and EDX results, the smallest diameter of particles and the most Ag composition was obtained after annealing for 3 hours. Fourier transform infrared (FTIR) spectroscopy indicate that the Ag nano catalyst were formed by Si-O-Ag bonds at 1379 cm-1.

Keywords
Nano catalyst, Silver, thermal evaporation, Annealing

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/W3EbwjrHcdQf

Corresponding Author
Dhewa Edikresnha

Institutions
a)Departement of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

b)Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

c)Department of Pharmaceutics, School of Pharmacy, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract
By means of electrospinning, composite fibers mat built from PVP (polyvinylpyrrolidone) and CA (Cellulose Acetate) with garlic extract as active agent and glycerin as additive has been successfully produced. The electrospun nanofiber mats for all variations show some cluster with branches of fibers as the effect of glycerin. The average fiber diameter of composite fiber decreased along with the increasing applied voltage from 12 to 15 kV. However, the average diameter reduced when the applied voltage increased afterwards. In the FTIR study, a sharp peak at 1014 cm-1 as the characteristic peak of garlic extract, which attributes to the existence of S=O group and proving the presence of organosulfur compounds such as alliin, allicin dan diallyl disulfide, was found. In the composite fibers of PVP/CA/Glycerin/Garlic, the characteristic peak of garlic shifted to a higher wavenumber 1036 cm-1.

Keywords
Polyvinylpyrrolidone, Cellulose Acetate, Glycerin, Garlic Extract, Electrospinning, Composite Fibers

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/uwrUbRPLtNah

Corresponding Author
Gian Prahasti

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
b) Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
*krijal[at]fi.itb.ac.id

Abstract
Fiber membranes of Polyvinyl Alcohol (PVA)/Shell extract of melinjo (SEM) have been successfully synthesized using electrospinning method. The synthesis begins by making a precursor solution between a mixture of SEM solution and PVA solution. The SEM solution was made at a concentration of 10% using an ethanol mixture with water while the PVA solution was made at a concentration of 20% with a water solvent. The precursor solution ware made by mixing PVA solutions and SEM solution at several mass ratio; 10:0, 10:1, 10:3, and 10:5, and then synthesized into fiber using electrospinning method. Characterization of digital microscope was used to see morphology and diameter of the fibers produced. Likewise, the wettability properties of fiber membrane was determined using contact angle meter. The results showed that as the weight fraction of SEM increased, diameter of fibers changes. Subsequently, the wettability properties of fiber membranes changed as the changing of weight fraction of SEM.

Keywords
Polyvinyl Alcohol (PVA), Shell extract of melinjo (SEM), membrane, fiber, electrospinning

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/3Fbd6XyvamzH

Corresponding Author
Retti Hanggia Anggela

Institutions
a) Division of Physical Chemistry, Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Jl. W.R Supratman, Kandang Limun 38371 A Bengkulu, Indonesia
*asdim[at]unib.ac.id
b) Division of Inorganic Chemistry, Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Bengkulu, Jl. W.R Supratman, Kandang Limun 38371 A Bengkulu, Indonesia

Abstract
The application of SnO2 nanoparticles has been carried out in various fields, one of which is as photoelectrode on dye sensitized solar cells (DSSCs) due to their high electron mobility. In general the efficiency of DSSCs is absolutely dependent on the morphology of SnO2. Morphology in the form of aggregates could reduce the efficiency of DSSCs SnO2 nanoparticle based. The synthesis method to reduce the aggregate formation has been widely developed, one of which is green hydrothermal synthesis by the addition of capping agents. In this study, fructose was used as a capping agent in the synthesis of SnO2 nanoparticles using the hydrothermal method with a temperature variation of 120, 150 and 180 ⁰C which aims to reduce aggregate formation. The effect of adding fructose at different temperatures on the purity and morphology of SnO2 as synthesized was characterized using X-Ray Diffractometer (XRD) and Scanning Electron Microscope (SEM). The obtained XRD pattern clearly shows that all products produce high purity of SnO2 nanocrystal phases, it was proven by the absence of impurity peaks. In addition, SEM images show that the addition of fructose could reduce the aggregate form of SnO2 nanoparticles. These results indicate that the addition of fructose in the reaction solution can be an alternative method for controlling the morphology of SnO2 nanoparticles and is expected to improve the efficiency of DSSCs.

Keywords
Nanoparticle, SnO2, Capping agent, Fructose

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/X3bn96TjfkAG

Corresponding Author
Rizki Aldino Ahmad

Institutions
faculty of mathematic and natural science, Universitas Indonesia

Abstract
Silver nanoparticles (AgNPs) have been synthesized using 1,2-propanediol as a reducing agent, and polyvinyl alcohol as a capping agent. In this present work, the effect of pH on the reduction rate and final product of AgNPs have been investigated. The particles were collected and characterized using an ultraviolet-visible spectrometer and a transmission electron microscope. The results show that the pH affects the reduction rate and morphology of the particles. The reduction rate of Ag atoms increases as the pH incrases which leads to the formation of bigger particles with irregular shape. Meanwhile, when the pH was decreased, the reduction rate of Ag atoms was found to decrease, resulting in the formation of smaller particles with more regular shape. The difference in reduction rate is ascribed due to the descrepancy of the equilibrium reaction for formation of Ag atoms.

Keywords
Silver Nanoparticles, 1,2-propanediol, reduction agent, capping agent

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/qFMQzY8yDXne

Corresponding Author
Denny Arianto

Institutions
(a) Departement of Physics, Faculty of mathemathic Natural Science, Institut Teknologi Bandung
(b) Research Center for Bioscience and Biotechnology
Institut Teknologi Bandung, Jl Ganesa no. 10, Bandung 40132, Indonesia
Corresponding Author : *krijal[at]fi.itb.ac.id, **miftah[at]fi.itb.ac.id

Abstract
Rotary forcespinning (RFS) is a method to produce fiber. This method is very efficient, low cost and very produtive compared to other method. It has high rate production than electrospinnig. This study focused on the synthesis of mixture polyvinyl pyrolidone (PVP) and Polyethylene glycol (PEG) fibers using RFS with varying rotating speed. The Fiber produced using RFS and solutions of PVP/PEG in distilled water and ethanol with concentrations 14 wt.%. The RFS process was performed at different rotational speed starting from 6.000, 8.000, 10.000, 12.000 and 14.000 rpm. The morphology and average diameter of PVP/PEG fibers was investigated using optical microscopy. Beaded fibers were at rotating speed 6.000 dan 8.000. The results showed that diameter of fibers decreased as rotating speed of RFS increased. The diameter of the PVP/PEG fibers was uniform

Keywords
rotary forcespinning, polyvinyl pyrolidone , Polyethylene glycol, fiber

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/auZk6dAJYctq

Corresponding Author
Gian Prahasti

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
b) Research Center of Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
*krijal[at]fi.itb.ac.id

Abstract
Fiber membranes from waste Acrylonitrile Butadiene Styrene (w-ABS)/Polyvinylpyrrolidone (PVP) has been successfully made using an electrospinning method. The precursor solutions were prepared using DMAc solvents at a concentration of 30 wt%. We varied the w-ABS:PVP ratio of 3:0, 2.9:0.1, 2.5:0.5, and 2:1. A digital optical microscope observed the morphology of the fabricated fiber membranes while a contact angle meter determined their wettability. The results showed that the morphology of the fibers changed with the ratio of w-ABS:PVP. Consequently, the variation of w-ABS:PVP ratio caused a significant effect to the value of membranes contact angle.

Keywords
fiber membranes, electrospinning, waste ABS, PVP, wettability

Topic
Nano Science and Technology

Link: https://ifory.id/abstract/Pd3WVyCE42x7