การสังเคราะห์และศึกษาสมบัติของผงผลึกนาโน SnO2 ด้วยวิธีไฮโดรเทอร์มอล SYNTHESIS AND CHARACTERIZATION OF SnO2 NANOCRYSTALLINE POWDER BY HYDROTHERMAL METHOD
Keywords:
Tin Oxide, Hydrothermal Method, Nanocrystalline Powders, Synthesis, Tetragonal StructureAbstract
This work reports the synthesis and characterization of nanocrystalline tin oxide (SnO2) powders prepared by a hydrothermal method. The study has been carried out using X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-vis spectroscopy (UV-vis) techniques. The crystal structure of the samples was studied by X-ray diffraction. The XRD results confirmed the formation of a tetragonal SnO2 structure. The crystalline size of the samples were about 5.2-7.4 nm as evaluated by the XRD data. The TEM and HR-TEM (high-resolution transmission electron microscopy) images show that the samples were formed in small spherical shape with 5.58±0.97 to 7.82±1.32 nm in particles size and a well dirtribution. The corresponding selected-area electron diffraction (SAED) analysis further confirmed the formation of the tetragonal SnO2 without any impurity phases. The optical properties of the samples were explored by optical absorption spectra and the samples band gap in the range of 3.71-3.78 eV. The result suggest that the heat tretment temperature of hydrothermal process is important to control the size of SnO2 nanoparticles. The size of samples play a significant role on energy band gap of SnO2 nanoparticles.
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