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Room-temperature gas sensors based on ZnO nanorod/Au hybrids: Visible-light-modulated dual selectivity to NO2 and NH3.
J Hazard Mater 2019; 381:120919JH

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 addition, the ultrathin diameters of nanorods also synergistically contributed to the light-controlled dual gas selectivity. The presently developed light modulation strategy provides an alternative approach to highly-selective and dual-functional gas sensors operating at room temperature.

Authors+Show Affiliations

Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China. Electronic address: jingwang@jiangnan.edu.cn.Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China.Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.Department of Ecosystem Science and Management and Materials Research Institute, 204 Energy and the Environment Laboratory, The Pennsylvania State University, University Park, PA 16802, USA. Electronic address: sxk7@psu.edu.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31369934

Citation

Wang, Jing, et al. "Room-temperature Gas Sensors Based On ZnO nanorod/Au Hybrids: Visible-light-modulated Dual Selectivity to NO2 and NH3." Journal of Hazardous Materials, vol. 381, 2019, p. 120919.
Wang J, Fan S, Xia Y, et al. Room-temperature gas sensors based on ZnO nanorod/Au hybrids: Visible-light-modulated dual selectivity to NO2 and NH3. J Hazard Mater. 2019;381:120919.
Wang, J., Fan, S., Xia, Y., Yang, C., & Komarneni, S. (2019). Room-temperature gas sensors based on ZnO nanorod/Au hybrids: Visible-light-modulated dual selectivity to NO2 and NH3. Journal of Hazardous Materials, 381, p. 120919. doi:10.1016/j.jhazmat.2019.120919.
Wang J, et al. Room-temperature Gas Sensors Based On ZnO nanorod/Au Hybrids: Visible-light-modulated Dual Selectivity to NO2 and NH3. J Hazard Mater. 2019 Jul 25;381:120919. PubMed PMID: 31369934.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Room-temperature gas sensors based on ZnO nanorod/Au hybrids: Visible-light-modulated dual selectivity to NO2 and NH3. AU - Wang,Jing, AU - Fan,Saiying, AU - Xia,Yi, AU - Yang,Cheng, AU - Komarneni,Sridhar, Y1 - 2019/07/25/ PY - 2019/02/16/received PY - 2019/07/13/revised PY - 2019/07/23/accepted PY - 2019/8/2/pubmed PY - 2019/8/2/medline PY - 2019/8/2/entrez KW - Au nanoparticles KW - Dual selectivity KW - Room-temperature gas sensors KW - Visible-light KW - ZnO nanorods SP - 120919 EP - 120919 JF - Journal of hazardous materials JO - J. Hazard. Mater. VL - 381 N2 - 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 addition, the ultrathin diameters of nanorods also synergistically contributed to the light-controlled dual gas selectivity. The presently developed light modulation strategy provides an alternative approach to highly-selective and dual-functional gas sensors operating at room temperature. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/31369934/Room_temperature_gas_sensors_based_on_ZnO_nanorod/Au_hybrids:_Visible_light_modulated_dual_selectivity_to_NO2_and_NH3_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(19)30872-6 DB - PRIME DP - Unbound Medicine ER -