Oxidizing gas sensing properties of the n-ZnO/p-Co₃O₄ composite nanoparticle network sensor

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• 作者：Sunghoon ParkAuthor Vitae ; Soohyun KimAuthor Vitae ; Hyejoon KheelAuthor Vitae ; Chongmu Lee ; ^{cmlee@inha.ac.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：ZnO ; Co3O4 ; Nanoparticle ; Gas sensors ; UV
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：222
• 期：Complete
• 页码：1193-1200
• 全文大小：2416 K

文摘

ZnO/Co₃O₄ (ZnO/Co₃O₄ = 4:1) composite nanoparticles were synthesized via a facile solvothermal route. The 4:1 ZnO/Co₃O₄ composite nanoparticle network sensor showed significantly enhanced NO₂ gas sensing performance compared to its pure ZnO nanoparticle sensor counterpart. The ZnO/Co₃O₄ composite nanoparticle sensor showed responses of 346–1602% to 0.1–5 ppm of NO₂ at room temperature under UV illumination at 3.7 mW/cm², whereas ZnO nanoparticle sensors showed responses of 264–707%. The former also showed faster response to NO₂ gas and higher selectivity to NO₂ gas than the latter. The responses of the sensors to NO₂ increased with increasing UV illumination intensity. In addition, the underlying mechanism for the enhanced sensing performance of the ZnO/Co₃O₄ composite nanoparticle sensor toward a strong oxidizing gas NO₂ under UV illumination was examined. Particular emphasis was placed on the role of the p/n junction in the composite nanoparticle sensor.