Synthesis of Cubic In2O3 by a Liquid Plasma Method without Chemical Additives

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• 作者：Seong-Hoon Kim ; Ho-Suk Choi ; Kwang-Deog Jung
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：March 2, 2016
• 年：2016
• 卷：16
• 期：3
• 页码：1387-1394
• 全文大小：621K
• ISSN：1528-7505

文摘

Cubic In(OH)₃ crystals were prepared by a liquid plasma method at 6 kV and 55 mA using an H-cell. The solution pH in the cathode increased with the reaction time up to 15 min due to proton reduction, which promoted the deprotonation of In aqua complexes. In(OH)₃ was formed by the deprotonation of these complexes during proton reduction. After 15 min, the pH in the cathode cell was significantly decreased, which was ascribed to proton transfer from the anode to the cathode. pH measurements showed that a pH difference between the cathode and anode cells developed during the reaction. Nucleation and crystal growth were monitored via high-resolution transmission electron microscopy and selected area electron diffraction analysis of samples prepared with different reaction times. Initially, small amorphous particles were formed by Ostwald ripening, and these particles rearranged to form rods with 50–90 nm lengths. Cubic In(OH)₃ crystals formed via the oriented attachment of the rods. Finally, cubic In₂O₃ crystals were prepared by calcining the In(OH)₃ samples. Photoluminescence emission peaks corresponding to green and orange emissions were observed for the In₂O₃ prepared by calcining the In(OH)₃ samples. Further, XPS analysis revealed oxygen defects in the In₂O₃ nanocubes.