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Issue 16, 2015
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Enhanced piezo-humidity sensing of a Cd–ZnO nanowire nanogenerator as a self-powered/active gas sensor by coupling the piezoelectric screening effect and dopant displacement mechanism

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Abstract

Highly sensitive humidity sensing has been realized from a Cd-doped ZnO nanowire (NW) nanogenerator (NG) as a self-powered/active gas sensor. The piezoelectric output of the device acts not only as a power source, but also as a response signal to the relative humidity (RH) in the environment. The response of Cd–ZnO (1 : 10) NWs reached up to 85.7 upon exposure to 70% relative humidity, much higher than that of undoped ZnO NWs. Cd dopant can increase the number of oxygen vacancies in the NWs, resulting in more adsorption sites on the surface of the NWs. Upon exposure to a humid environment, a large amount of water molecules can displace the adsorbed oxygen ions on the surface of Cd–ZnO NWs. This procedure can influence the carrier density in Cd–ZnO NWs and vary the screening effect on the piezoelectric output. Our study can stimulate a research trend on exploring composite materials for piezo-gas sensing.

Graphical abstract: Enhanced piezo-humidity sensing of a Cd–ZnO nanowire nanogenerator as a self-powered/active gas sensor by coupling the piezoelectric screening effect and dopant displacement mechanism

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Publication details

The article was received on 12 Feb 2015, accepted on 13 Mar 2015 and first published on 17 Mar 2015


Article type: Paper
DOI: 10.1039/C5CP00893J
Phys. Chem. Chem. Phys., 2015,17, 10856-10860

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    Enhanced piezo-humidity sensing of a Cd–ZnO nanowire nanogenerator as a self-powered/active gas sensor by coupling the piezoelectric screening effect and dopant displacement mechanism

    B. Yu, Y. Fu, P. Wang, Y. Zhao, L. Xing and X. Xue, Phys. Chem. Chem. Phys., 2015, 17, 10856
    DOI: 10.1039/C5CP00893J

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