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Title: Radiation Enhancement by Graphene Oxide on Microelectromechanical System Emitters for Highly Selective Gas Sensing
Authors: Li, Nanxi
Xu, Linfang
Tao, Jifang
Ng, Doris Keh Ting
Lee, Lennon Yao Ting
Cheam, Daw Don
Zeng, Yongquan
Qiang, Bo
Wang, Qijie
Cai, Hong
Singh, Navab
Zhao Dan 
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry, Analytical
Nanoscience & Nanotechnology
Science & Technology - Other Topics
MEMS emitters
thermal emission
graphene oxide
radiation enhancement
infrared gas sensing
Issue Date: 1-Oct-2019
Citation: Li, Nanxi, YUAN HONGYE, Xu, Linfang, Tao, Jifang, Ng, Doris Keh Ting, Lee, Lennon Yao Ting, Cheam, Daw Don, Zeng, Yongquan, Qiang, Bo, Wang, Qijie, Cai, Hong, Singh, Navab, Zhao Dan (2019-10-01). Radiation Enhancement by Graphene Oxide on Microelectromechanical System Emitters for Highly Selective Gas Sensing. ACS SENSORS 4 (10) : 2746-2753. ScholarBank@NUS Repository.
Abstract: Copyright © 2019 American Chemical Society. Infrared gas sensors have been proven promising for broad applications in Internet of Things and Industrial Internet of Things. However, the lack of miniaturized light sources with good compatibility and tunable spectral features hinders their widespread utilization. Herein, a strategy is proposed to increase the radiated power from microelectromechanical-based thermal emitters by coating with graphene oxide (GO). The radiation can be substantially enhanced, which partially stems from the high emissivity of GO coating demonstrated by spectroscopic methods. Moreover, the sp2 structure within GO may induce plasmons and thus couple with photons to produce blackbody radiation and/or new thermal emission sources. As a proof-of-concept demonstration, the GO-coated emitter is integrated into a multifunctional monitoring platform and evaluated for gas detection. The platform exhibits sensitive and highly selective detection toward CO2 at room temperature with a detection limit of 50 ppm and short response/recovery time, outperforming the state-of-the-art gas sensors. This study demonstrates the emission tailorability of thermal emitters and the feasibility of improving the associated gas sensing property, offering perspectives for designing and fabricating high-end optical sensors with cost-effectiveness and superior performance.
Source Title: ACS SENSORS
ISSN: 2379-3694
DOI: 10.1021/acssensors.9b01275
Appears in Collections:Staff Publications

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