Effects of Heating Rate on the Nucleation, Growth, and Transformation of InOOH and In2O3 via Solvothermal Reactions

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• 作者：Shunxi Tang ; Jian Zhang ; Si Wu ; Chunyuan Hu ; Yingai Li ; Lina Jiang ; Qiliang Cui
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：September 11, 2014
• 年：2014
• 卷：118
• 期：36
• 页码：21170-21176
• 全文大小：524K
• ISSN：1932-7455

文摘

A solvothermal reaction is generally considered to be governed by the chemical and thermodynamic parameters. Yet, the effects of heating rate on the nucleation and growth of the target materials within solvothermal processes have been rarely reported. In this work, taking the solvothermally synthesized InOOH/In₂O₃ as the sample system we intend to illustrate that the heating rate plays an important role in the nucleation, growth, and transformation in solvothermal reactions. It is shown that with the heating rate changing from 4 to 8 掳C/min, the initial nucleation temperature for ultrathin InOOH nanowires drops greatly from 160 to 120 掳C. At a heating rate of 4 掳C/min, the transformation from InOOH nanowires to In₂O₃ nanocubes in the one-step solvothermal system begins at 170 掳C and completes at 210 掳C. While at a heating rate of 8 掳C/min, the transformation begins at 130 掳C and completes at 180 掳C. It is also found that heating rate may trigger different growth mechanisms in the solvothermal system and subsequently influence the microstructure of the products. Thus, it is anticipated that controlling the heating rate may be a potential route to tailor the morphology, microstructure, and even the properties of materials via solvothermal processes.