Realization of a room-temperature/self-powered humidity sensor, based on ZnO nanosheets

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• 作者：E. ModaresinezhadAuthor Vitae ; S. Darbari ; ^{s.darbari@modares.ac.ir" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：ZnO nanosheets ; Nanogenerator ; Gas sensor ; Self-powered sensor
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：237
• 期：Complete
• 页码：358-366
• 全文大小：2539 K

文摘

In this paper, we report the first use of ZnO nanosheet-based direct-current nanogenerators (NG), as a room-temperature self-powered humidity sensor. It has been shown that the networked ZnO nanosheets are structurally stable under external mechanical pressures; hence these 2D nanostructures can be proposed as an emerging/attractive candidate in the field of mechanical energy harvesting. Also, benefiting from the high surface adsorption activity and large surface-to-volume ratio of ZnO nanosheets, we propose the fabricated NG as a promising self-powered gas sensor. Our study demonstrates short circuit and open circuit sensitivities of about 43.4% and −2.96%, because of humidity exposure. It is notable that the achieved output short circuit sensitivity is more than 10 times higher than the maximum sensitivity of a recently reported self-powered humidity sensor, based on ZnO nanorods. High sensitivity and stability, as well as direct-current output current are attractive properties of the realized humidity sensor, which can be proposed as a promising self-powered sensor.