Synthesis and Characterization of CuAlO2 and AgAlO2 Delafossite Oxides through Low-Temperature Hydrothermal Methods

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• 作者：Dehua Xiong ; Xianwei Zeng ; Wenjun Zhang ; Huan Wang ; Xiujian Zhao ; Wei Chen ; Yi-Bing Cheng
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：April 21, 2014
• 年：2014
• 卷：53
• 期：8
• 页码：4106-4116
• 全文大小：786K
• 年卷期：v.53,no.8(April 21, 2014)
• ISSN：1520-510X

文摘

In this work, we present one-step low temperature hydrothermal synthesis of submicrometer particulate CuAlO₂ and AgAlO₂ delafossite oxides, which are two important p-type transparent conducting oxides. The synthesis parameters that affect the crystal formation processes and the product morphologies, including the selection of starting materials and their molar ratios, the pH value of precursors, the hydrothermal temperature, pressure, and reaction time, have been studied. CuAlO₂ crystals have been synthesized from the starting materials of CuCl and NaAlO₂ at 320鈥?00 掳C, and from Cu₂O and Al₂O₃ at 340鈥?00 掳C, respectively. AgAlO₂ crystals have been successfully synthesized at the low temperature of 190 掳C, using AgNO₃ and Al(NO₃)₃ as the starting materials and NaOH as the mineralizer. The detailed elemental compositions, thermal stability, optical properties, and synthesis mechanisms of CuAlO₂ and AgAlO₂ also have been studied. Noteworthy is the fact that both CuAlO₂ and AgAlO₂ can be stabilized up to 800 掳C, and their optical transparency can reach 60%鈥?5% in the visible range. Besides, it is believed the crystal formation mechanisms uncovered in the synthesis of CuAlO₂ and AgAlO₂ will prove insightful guildlines for the preparation of other delafossite oxides.