Room-temperature gas sensors based on ZnO nanorod/Au hybrids: Visible-light-modulated dual selectivity to NO2 and NH3

Journal of Hazardous Materials
Jing WangSridhar Komarneni

Abstract

Gas sensors play vital roles in air pollution monitoring. Despite considerable progress in improving the room-temperature gas sensing sensitivities and rates of materials, comparably less attention is paid to the sensor selectivity. Here, ultrathin ZnO nanorods (˜15 nm) were synthesized by a nanoseed-assisted wet chemical approach and subsequently functionalized by Au nanoparticles by a photoreduction method. The hybrid material exhibited visible-light-activity owing to the surface plasmon resonance (SPR) effects of Au nanoparticles. The ZnO/Au hybrids were assembled into a high-performance, optically-controlled gas sensor operating at room temperature, which was found to be more selective to NH3 in dark but showed high selectivity to NO2 under visible-light illumination (λ = 532 nm). Moreover, the sensors exhibited high response and short response and recovery times as well as excellent reversibility and selectivity at room temperature. Such visible-light-modulated dual gas selectivity could be mainly attributed to the opposite direction of electron transfer between ZnO and Au nanoparticles in dark and under visible-light illumination, which led to the different surface depletion characteristics of the ZnO nanorods. In additio...Continue Reading

Citations

Jan 24, 2021·Journal of Hazardous Materials·Yongshan XuNicola Pinna
May 2, 2021·Journal of Hazardous Materials·Jingjing LiuJiaguo Yu
May 14, 2021·Journal of Nanoscience and Nanotechnology·Zhijun ZouJiayou Tao
Jun 1, 2021·Journal of Colloid and Interface Science·Jingjing LiuJiaguo Yu
Jul 3, 2021·Micromachines·Shahrooz RahmatiKostya Ken Ostrikov
Apr 2, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Huaping WangJie Huang

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