Controllable synthesis of Co₃O₄ crossed nanosheet arrays toward an acetone gas sensor

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• 作者：Ziyue Zhang^aAuthor Vitae ; Liping Zhu^a ; ^{zlp1@zju.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Zhen Wen^a ; ^bAuthor Vitae ; Zhizhen Ye^aAuthor Vitae
• 关键词：Cobalt oxide ; Crossed nanosheet arrays ; Gas sensor ; Low temperature
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：238
• 期：Complete
• 页码：1052-1059
• 全文大小：2809 K

文摘

Co₃O₄ crossed nanosheet (CNS) arrays were successfully synthesized by a post-thermal conversion of (Co(NH₃)₆)CoF₆·H₂O precursor after a fluorine-assisted hydrothermal route. With the increment of the reaction time, the morphology of precursor changed continually. In the formation process, sodium citrate plays a role of surfactant, and NH₄F serves as a source for the generation of both the ammonia cations and fluoride anion, as well as urea acts as the precipitant. The CNSs are interdigitated and perpendicular to the substrate, and the thickness of irregular nanosheets are 30–100 nm. The mesoporous structure can be obtained after annealing with the specific surface area of 83 m² g⁻¹ and the average pore diameter of ∼8.5 nm. Owing to the direct growth on the substrates, the Co₃O₄ CNS arrays could serve as a prototype gas sensor straightway. The sensor showed outstanding low temperature gas-sensing properties with a gas response of ∼36.5 to 1000 ppm acetone vapour at 111 °C. The sensor also exhibited good selectivity and excellent stability.