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Improved Ethanol Gas Sensing Performances of ZnO/Co3O4 Composite Induced by its Flytrap-like Structure

Abstract

Nanocomposite materials with excellent receptor and transducer functions are much promising in ameliorating their gas sensing properties. However, due to the abrupt changes of receptor and transducer functions when different components are combined together, structure engineering that considers both receptor and transducer functions to design such desirable sensing materials still remains a great challenge. Here, a nanocomposite material composed of 1D ZnO nanorods and 3D Co3O4 microspheres assembled by single-crystalline porous nanosheets has been designed, which was inspired by the high-efficiency receptor-transducer-response structure of venus flytrap. The as-designed ZnO/Co3O4 exhibited high responses (Ra/Rg=125 to 100 ppm ethanol), which is 84 times and 8 times higher than that of Co3O4 (Rg/Ra =1.43) and ZnO (Ra/Rg=15), respectively. The excellent sensing properties are ascribed to the as-designed flytrap-like structure which possesses super receptor function from 1D ZnO with large surface area, p-n heterojunctions with amplified response signal, as well as excellent transducer functions from single-crystalline porous Co3O4 with fast charge transport channels. This strategy provides us a new guidance on the exploring of high-performance gas sensors which could further extend to other bio-structures that are abundant in nature.

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Publication details

The article was received on 02 Aug 2017, accepted on 03 Oct 2017 and first published on 03 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05228F
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Improved Ethanol Gas Sensing Performances of ZnO/Co3O4 Composite Induced by its Flytrap-like Structure

    K. Xu, L. Yang, Y. Yang and C. Yuan, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP05228F

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