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.

中文翻译：

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石墨烯氧化物在微机电系统发射器上的辐射增强作用，用于高度选择性的气体传感。

红外气体传感器已被证明在物联网和工业物联网中具有广泛的应用前景。然而，缺乏具有良好兼容性和可调谐光谱特征的小型光源阻碍了它们的广泛应用。在此，提出了一种通过涂覆氧化石墨烯（GO）来增加基于微机电的热发射器的辐射功率的策略。可以显着增强辐射，这部分归因于分光镜方法证明的GO涂层的高发射率。而且，sp ²GO内部的结构可以诱导等离子体激元，并因此与光子耦合以产生黑体辐射和/或新的热发射源。作为概念验证的演示，GO涂层发射器已集成到多功能监控平台中并进行了气体检测评估。该平台在室温下对CO ₂表现出灵敏且高度选择性的检测，检测极限为50 ppm，响应/恢复时间短，优于最新的气体传感器。这项研究证明了热辐射器的发射适应性以及改善相关气体传感特性的可行性，为设计和制造具有成本效益和卓越性能的高端光学传感器提供了前景。