Enhancing ZnO nanowire gas sensors using Au/Fe2O3 hybrid nanoparticle decoration

Zhang, Bo; Huang, Yingyu; Vinluan, Rodrigo; Wang, Sibo; Cui, Can; Lu, Xingxu; Peng, Chuanqi; Zhang, Mingwan; Zheng, Jie; Gao, Pu-Xian

doi:10.1088/1361-6528/ab89cf

Title: Enhancing ZnO nanowire gas sensors using Au/Fe₂O₃ hybrid nanoparticle decoration

Journal Article · Thu May 28 00:00:00 EDT 2020 · Nanotechnology

DOI:https://doi.org/10.1088/1361-6528/ab89cf· OSTI ID:1799728

Zhang, Bo ^[1]; Huang, Yingyu ^[2]; Vinluan, Rodrigo ^[2]; Wang, Sibo ^[1]; Cui, Can ^[1]; Lu, Xingxu ^[1]; Peng, Chuanqi ^[2]; Zhang, Mingwan ^[1]; Zheng, Jie ^[2];

^[1]

Univ. of Connecticut, Storrs, CT (United States). Dept. of Materials Science and Engineering. Inst. of Materials Science
Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Chemistry

Heterojunctions are an important strategy for designing high performance electrical sensor materials and related devices. Herein, a new type of metal-semiconductor hybrid nanoparticle has been successfully used to remarkably sensitize the surface of ZnO nanowires for detecting NO₂ with high responses over a broad temperature window ranging from room temperature to 600 °C. These hybrid nanoparticles are comprised of iron oxide nanowires with well dispersed single crystalline Au nanoparticles. The hybrid nanoparticle decorated ZnO nanowires have achieved a giant response, as high as 74 500 toward NO₂ gas, about 42 times that of Au decorated ZnO nanowire sensors. This dramatic enhancement may be attributed to the efficient charge transfer across the Au–Fe₂O₃ Schottky and Fe₂O₃–ZnO semiconductor heterojunction interfaces. Due to the incorporation of thermally-stable Fe₂O₃ nanoparticles as the support of Au nanoparticles, the working temperature of nanowire sensors was successfully extended to higher temperatures, with an increase of 200 °C, from 400 °C to 600 °C. Such a combination of semiconductor heterojunction and semiconductor-metal Schottky contact presents a new strategy for designing high performance electrical sensors with high sensitivity, stability, selectivity, and wide operation temperature window, which are potentially suitable for advanced energy systems such as automotive engines and power plants.

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Research Organization:: Univ. of Connecticut, Storrs, CT (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0000870; FE0011577; FE0000870 and DE-FE0011577

OSTI ID:: 1799728

Alternate ID(s):: OSTI ID: 1631069

Journal Information:: Nanotechnology, Vol. 31, Issue 32; ISSN 0957-4484

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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