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Tin (IV) dioxide (SnO2) is a semiconductor material with a band gap of around 3.6 eV. It is considerable technological importance with a number of applications, especially for photoelectrodes, detection of flammable toxic gases, thin film coatings, and gas sensors. This research aims to determine the effect of variations in glucose concentration as a capping agent to the crystallinity and morphology of SnO2. The synthesis of SnO2 nanoparticles has been investigated by using several methods such as hydrothermal, sol-gel and solvhotermal methods. Especially for hydrothermal method, several capping agents such as rarasaponin in Sapindus rarak, cetyl trimethylammonium bromide (CTAB), and ethylenediaminetetraacetid acid (EDTA) that can reduce the formation of aggregates. This synthesis was carried out by the hydrothermal method at 100 oC for 3 hours. SnO2 nanoparticles as synthesized was characterized by using X-Ray Difraction (XRD) and Scanning Electron Microscope (SEM). The crystallinity of SnO2 nanocrystal as shown in XRD pattern was influence by changing of glucose concentration. SEM images show that aggregate formation is influenced by variations of glucose concentration as a capping agent. These results show that aggregate growth in the formation of SnO2 nanoparticles could be controlled by optimized glucose concentration in reaction solution.