Chiang Mai Journal of Science

 This paper reports the synthesis and characterization of In₂O₃ nanoparticles by a simple polymer complex method using indium (III) nitrate and polyvinyl pyrrolidone (PVP) as the starting chemicals. The precursors were calcined at different temperatures to obtain In₂O₃ nanoparticles. The XRD and electron diffraction analysis results indicated that the In₂O₃ samples had a cubic structure without any impurity phases.The FT-IR analysis result confirmed the formation of In₂O₃. TEM revealed that the In₂O₃ samples consist of crystalline particle of 14.6– 24.6 nm which are weakly agglomerated. UV-vis spectroscopy was also performed to study the optical properties of synthesized In₂O₃ samples. The estimated band gap of the samples was 3.70-3.93 eV.