Reduced graphene oxide (rGO) encapsulated Co₃O₄ composite nanofibers for highly selective ammonia sensors

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• 作者：Qiuxia Feng^a ; ^bAuthor Vitae ; Xiaogan Li^a ; ^{lixg@dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Jing Wang^a ; ^{wangjing@dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Alexander M. Gaskov^cAuthor Vitae
• 关键词：Reduced graphene oxide (rGO) ; rGO encapsulated Co3O4 composite nanofibers ; Electrospinning ; Room-temperature gas sensors ; Ammonia
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：222
• 期：Complete
• 页码：864-870
• 全文大小：1465 K

文摘

The reduced graphene oxide (rGO) encapsulated Co₃O₄ nanocrystals were fabricated by using the electrospinning technology. The sample shows nanofiber morphology and the Co₃O₄ nanocrystals were wrapped by rGO thin layers. The as-electrospun rGO–Co₃O₄ nanofibers based chemoresistive sensor exhibited a p-type semiconductor behavior in ambient conditions and showed an excellent sensitivity with a fast response and recovery to different concentrations of ammonia from 5 to 100 ppm at room temperature. The sensor displays selectivity to several potential interferrents such as methanol, ethanol, formaldehyde, acetone, benzene, and methylbenzene. It may be attributed to the unique hierarchical wrapping microstructure and the selective NH₃ adsorption at both the wrapping layer of rGO and the polarized CCo³⁺ covalent centers within the nanofibers.