Indonesia Conference Directory

Corresponding Author
Ea Cahya Septia Mahen

Institutions
a. Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung, Indonesia 40132
b. Department of Physics Education, UIN Sunan Gunung Djati Bandung, Jl. A. H. Nasution 105 Bandung Indonesia 40614,
c. Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung, Indonesia 40132

*Email: ferry[at]fi.itb.ac.id

Abstract
This paper reports the synthesis and characterization of a composite thin film of waste derived acrylic plastic (PMMA) and MAPbBr3 perovskite nanocrystal that prepared by ligand assisted re-precitation (LARP) method. The composite thin film was prepared from MABr, PbBr2, oleic acid and oleylamine, N,N-dimethylformamide (DMF) as precursor, toluene as a solvent, and waste derived PMMA as polymer, and then deposited on glass substrate using a spin coater with varied speed. As the result, The highest transmittance value was around 90% for sample with the high spin speed (3000 rpm). The photoluminescence of MAPbBr3 film when illuminated by UV shows a bright green color with a peak at 536 nm wavelength and maximum luminescence found in the sample with the lower spin speed (1000 rpm). Thus, the fabricated perovskite composite thin film using recycled acrylic plastic has a good prospect to be applied in optoelectronic application

Keywords
Perovskite, PMMA, waste acrylic

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/qBC3Q4LwUpYM

Corresponding Author
Dewi Lentang Johor Sri Banu

Institutions
1Department of Physics, Faculty of Mathematics and Natural Science,
Institut Teknologi Bandung (ITB), Jl. Ganesha 10 Bandung 40132, Indonesia
2Research Center for Nanoscience and Nanotechnology (RCNN)
*ferry[at]fi.itb.ac.id

Abstract
Carbon Dots (CDs) are materials that play a role in non-toxicity, biocompatibility, high photostability, changeable photoluminence, high solubility, and easy functionalization. Cellullose Nanofiber (CNF) is an environmentally friendly polymer that has biodegrability, good dispersion capabilities, and able to optimize material characteristics. In this research, CNF was added to the CDS synthesis process to determine the effect of CNF on CDs optical properties. CDs were characterized using Fourier-transform Infrared Spectroscopy (FTIR) to determine the chemical bond content on CDs. Absorbance properties with a UV-Vis spectrometer. Photoluminence properties using a photoluminescent (PL) spectrometer. The results of FTIR characterization obtained indicate that the CNF obtained can maintain the chemical bonds formed on the CD. From the UV-Vis results, the CNF approval gives an increase in the intensity of NIR absorbance from the CDs. While based on the result of PL characterization, there is a decrease in emission intensity from the resulting CDs.

Keywords
Absorbance, Carbon Dots, Cellulose nanofiber, Photoluminescent

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/ckpgQd8YMxPR

Corresponding Author
Triati Dewi Kencana Wungu

Institutions
a) Nuclear Physics and Biophysics Research Group, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia
*triati[at]fi.itb.ac.id
b) Theoretical High Energy Physics and Instrumentation Research Group, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia
c) Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
The density functional theory (DFT) study of the Pb intercalation in the Montmorillonite was investigated. The influence of Al doping on the tetrahedral silicate layer and Mg doping on the octahedral layer of montmorillonite was analyzed. The change in geometric structure due to the Pb intercalation in the montmorillonite was observed. The results indicated that Pb is tend to be located on the ditrigonal surface of montmorillonite and it is near the area of doping atoms (Al. Mg). The intercalation of Pb creates the Pb-O bond formation.

Keywords
DFT, Pb, montmorillonite

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/HPYRpzvXxM6J

Corresponding Author
Lukas Primahatva Adhitya Krisna

Institutions
Theoretical High Energy Physics and Instrumentation Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Research Center for Physics, Indonesian Insitute of Sciences (LIPI)

Abstract
The efficiency of a thermoelectric material to be used as a heat machine is characterized by its thermoelectric figure of merit ((ZT)). The figure of merit itself is dependent on three transport quantities: (1) electrical conductivity ((sigma)), (2) Seebeck coefficient or thermoelectric power ((S)), and (3) electrical thermal conductivity ((kappa_e)). The three quantities are calculated through Boltzmann transport theory using constant and inverse-density of state relaxation time approximation. In this paper, we investigate the thermoelectric properties of various width of ribbon system containing topological edge states. These systems are discussed here due to its unique nature for having both insulating states inside the ribbon and conducting states at the edge which is topologically protected. The width of the ribbon depends on the number of one-dimensional wire stacking. We seek to determine the enhancement effect of manipulating this quantity on thermoelectric properties of the ribbon system and compare it to the conventional bulk system on two-dimensional semiconductors.

Keywords
edge states, ribbon system, topological materials, thermoelectric properties

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/rNumhCp3ngjF

Corresponding Author
Deriyan Senjaya

Institutions
a) Theoretical Physics Laboratory
Department of Physics
Bandung Institute of Technology
Jalan Ganesha No.10, Bandung 40132, Indonesia
*deriyan191293[at]gmail.com

Abstract
Dirac-Weyl Semimetal (DWS) is a Dirac material with exotic properties that appear due to the presence of Massless Dirac Fermion (MDF). If the MDF is confined by certain potential, for example 1D coulomb potential, the exotic properties of DWS will increase. The enhancement also occurs simultaneously with a slow manipulation on coulomb potential, compared to MDF motion with parameter alpha_{t}. This enhancement particularly happens on its electrical transport properties because the MDF adiabatic dynamic is related to current. The enhancement gives an opportunity to DWS to be applied as FET, but the presence of adiabatic dynamic automatically generates slowly current enhancement. Therefore, we need to formulate auxiliary potential to accelerate the current enhancement. The auxiliary potential formulation was done by fast-forward method. The effect of these formulation was tested on graphene as DWS example with length L = (5 x 10-6; 2), then the current enhancement was examined with electrical conductance. Based on our result, manipulation of coulomb potential in 1 second increases the graphene conductance 1.153 and 1.057 times, respectively. The presence of conductance shift clearly indicates the current enhancement acceleration when an auxiliary potential is applied within the manipulation.

Keywords
Dirac-Weyl Semimetal; 1D Coulomb Potential; Adiabatic; Field Effect Transistor; Fast-Forward Method; Electrical Conductance

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/rXKwJ6DMb3cy

Corresponding Author
Arung Bahari Muslim

Institutions
a)Department of Physics, Faculty of Mathematics and Natural Sciences,
Institut Teknologi Bandung (ITB), Jl. Ganesha 10 Bandung, 40132, Indonesia
b)Research Center for Nanosciences and Nanotechnology (RCNN),
Institut Teknologi Bandung (ITB), Jl. Ganesha 10 Bandung, 40132, Indonesia
c)3Department of Chemistry, Universitas Pertamina,
Jalan Teuku Nyak Arief, Simprug, Jakarta, 12220, Indonesia
*ferry[at]fi.itb.ac.id

Abstract
Synthetic zeolite is one of materials that frequently use as a catalyst in aquathermolysis reaction for non conventional oil. The reason is because zeolite has pore structure, high selectivity, high stability, high specific area and has an acid Bronsted site. The mechanism of zeolite as a catalyst is by donating hydrogen from acid Bronsted site to the heteroatom (Sulfur,Nitrogen and Oxygen) bond in the non conventional crude oil which has been lysis in aquathermolysis reaction. However the hydrogen donor synthethic zeolite comes only from the acid Bronsted site. To improve the hydrogen donor in aquathermolysis reaction, we decided to cation exchanged the NaX by co-precipitation method. Cation exchanged process occurs by replacing the Na cation of the NaX with NH4, Therefore the amount hydrogen donor of the zeolite was increased for aquathermolysis reaction. The result of this research showed that NaX with 7 days of aging could increase the API Gravity heavy crude oil from 17 to 25. The composition samples and crystallinity of samples were characterized using Fourier Transform Infared (FTIR) spectroscopy and X-Ray Diffraction (XRD). The increasing amount of API Gravity of the heavy crude oil also shows that the heavy crude oil after aquathermolysis using NaX has higher quality crude oil.

Keywords
Aquathermolysis; Cation Exchanged; Enhanced Oil Recovery; Non Conventional Oil; and Zeolite

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/CMkvUL9dR4Yg

Corresponding Author
Annisa Rahman

Institutions
1) Physics Department
Bandung Institute of Technology
Jalan Ganesha No. 10, Bandung, Indonesia 40132
a) ann.rahman1412[at]gmail.com
b) inge[at]fi.itb.ac.id

Abstract
This study aimed to investigate the solidification process of 23% tetra-n-butyl ammonium bromide (TBAB) aqueous solution due to the application of DC voltage. TBAB hydrate is an example of thermal energy storage system with phase change temperature around 5–10 oC. The voltage was applied continuously through commonly sold copper electrodes which was inserted into the sample. The diameter of electrodes were 1 mm and the gap were approximately 0.5 mm. The value of the applied voltage in the range of 15 to 30 V was varied as the experimental parameter. The overall experiments were repeated for two times to ensure the data repeatability. The experimental results showed that the TBAB hydrate will not formed until a minimum value for 20 V voltage was applied. The increase of the voltage applied led to higher solidification temperature and reduction of the supercooling degree.

Keywords
Tetra-n-butyl ammonium bromide (TBAB); Solidification; DC Voltage; Solidification Temperature; Supercooling Degree

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/rkxUvd6tc9fH

Corresponding Author
Adhitya Gandaryus Saputro

Institutions
a) Engineering Physics Program, Faculty of Industrial Technology, Institut Teknologi Bandung, Jl.Ganesha 10, Bandung 40132, Indonesia
b) Advanced Functional Materials Research Group, Institut Teknologi Bandung, Jl.Ganesha 10, Bandung 40132, Indonesia
c) Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia
d) Engineering Physics Program, Institut Teknologi Sumatera (ITERA), Jl Terusan Ryacudu, Lampung 35365, Indonesia

Abstract
Research on the reduction of carbon dioxide (CO2) level in the atmosphere has become one of major research topics worldwide. One of those researches is to convert CO2 into other valuable chemical substances such as methanol and formic acid through hydrogenation process. However, by using conventional industrial catalysts such as Cu-based catalyst as an agent for CO2 hydrogenation, the cost of reaction can be very energy taxing due to the inability of the catalyst to interact properly with CO2 molecule. Recently, many researches regarding new catalysts emerge such as Ni-based catalysts. In this study, we try to use small size Ni cluster supported on graphitic material as an alternative for CO2 hydrogenation catalyst. As an initial step, we study the ability of the supported Ni cluster to interact with CO2 molecule utilizing density functional theory-based calculations. We find that CO2 molecule can be strongly adsorbed on the Ni-Ni site of the supported Ni cluster with a bidentate adsorption configuration. The formation of this CO2 bidentate adsorption configuration will reduce the required activation energies for the subsequent CO2 hydrogenation reaction steps.

Keywords
CO2; Nickel cluster; graphene; adsorption; density functional theory

Topic
Condensed Matter Physics

Link: https://ifory.id/abstract/uRhvpP7mWyqJ