Trimethylamine sensing properties of graphene quantum Dots/α-Fe₂O₃ composites

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• 作者：Tao Hu^a ; Xiangfeng Chu^a ; ^{xfchu99@ahut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Feng Gao^b ; Yongping Dong^a ; Wenqi Sun^a ; Linshan Bai^a
• 关键词：Graphene quantum dots ; α-Fe2O3 ; Gas sensor ; Trimethylamine vapor
• 刊名：Journal of Solid State Chemistry
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：237
• 期：Complete
• 页码：284-291
• 全文大小：3161 K

文摘

Graphene quantum dots (GQDs) were prepared by pyrolysis of citric acid. The sizes of the as-prepared GQDs were in the range of 2–4 nm. The GQDs/α-Fe₂O₃ composites were prepared by loading GQDs with α-Fe₂O₃ via a one-step facile hydrothermal method. The GQDs/α-Fe₂O₃ composites were characterized by XRD, TGA, FTIR, Raman, SEM and TEM, respectively. The sensor devices were fabricated using the GQDs/α-Fe₂O₃ composites as sensing materials. The effect of the amount of GQDs in the composites on the gas-sensing responses of the materials and the gas-sensing selectivity was investigated. The experimental results revealed that the sensor based on GQDs/α-Fe₂O₃ (S-15) composite exhibited high sensitivity and good selectivity to TMA vapor. The responses of the sensor based on GQDs/α-Fe₂O₃ (S-15) composite to 1000 ppm and 0.01 ppm TMA vapor attained 1033.0 and 1.9 at 270 °C, respectively. The response time and recovery time for 0.01 ppm TMA vapor were only 6 s and 4 s, respectively.