Thermally Stable SnO2 Nanocrystals: Synthesis and Application to Gas Sensors

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• 作者：Masayoshi Yuasa ; Koichi Suematsu ; Kiyomi Yamada ; Ken Watanabe ; Tetsuya Kida ; Noboru Yamazoe ; Kengo Shimanoe
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：August 3, 2016
• 年：2016
• 卷：16
• 期：8
• 页码：4203-4208
• 全文大小：416K
• 年卷期：0
• ISSN：1528-7505

文摘

In this study, we prepared thermally stable SnO₂ nanocrystals (ca. 4 nm) in a mixture of SnCl₄, tetraethylene glycol (TEG), and tetrabutylammonium hydroxide (TBAH) under reflux and obtained a highly sensitive semiconductor gas sensor. It has been determined both theoretically and experimentally that the synthesis of oxide semiconductor nanoparticles is an important factor in highly sensitive semiconductor gas sensors. However, as-synthesized nanocrystals generally grow large during calcination at high temperature, and this thermal crystal growth reduces the sensor response. Therefore, to refine the response of the semiconductor gas sensor, we synthesized thermally stable SnO₂ nanocrystals by heating under reflux a SnCl₄-TBAH-TEG mixture. The obtained SnO₂ nanocrystals exhibited high thermal stability even when calcined at a temperature up to 600 °C. The gas-sensing films fabricated from the thermally stable SnO₂ nanocrystals exhibited a high sensor response to hydrogen due to their small crystal size, and a change in their surface property as compared with conventional SnO₂ nanocrystals synthesized via hydrothermal treatment.