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Suspended SnS_2 Layers by Light Assistance for Ultrasensitive Ammonia Detection at Room Temperature

机译：在室温下通过光辅助悬浮SnS_2层进行氨气的超灵敏检测

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摘要

2D materials are extensively studied as candidates for chemical sensors due to their large surface-to-volume-ratio and the low working temperature. However, the performance of 2D material-based sensors is limited when detecting ammonia, due to the weak binding between ammonia molecules and channel materials. Previous reports show sensitivity in the ppb range upon NO2 exposure, and in ppm levels of ammonia under the same conditions. Compared with the traditional SnS2 sensors, the demonstrated suspended devices with light excitation exhibit a higher sensitivity, a faster response, and recovery rate. At room temperature, the devices show obvious response to NH3 vapor at a concentration as low as 20 ppb. High selectivity to ammonia over many other chemical gases is observed. Such arresting features originate from the suspended structure enhancing reaction area and the light excitation inducing increased charge density that facilitates the ammonia detection. The enhanced sensing performance demonstrates the superiority of the suspended structure with light assistance, and this method can be applied to other 2D material-based sensors on optimizing their performance.
机译：由于2D材料具有较大的表面积与体积之比和较低的工作温度，因此被广泛用作化学传感器的候选材料。但是，由于氨分子与通道材料之间的结合力较弱，因此在检测氨气时，基于2D材料的传感器的性能受到限制。以前的报告显示，在暴露于NO2的情况下，灵敏度在ppb范围内，在相同条件下，其灵敏度在ppm级的氨中。与传统的SnS2传感器相比，已演示的带光激发的悬挂设备具有更高的灵敏度，更快的响应速度和恢复速度。在室温下，该器件在浓度低至20 ppb时对NH3蒸气表现出明显的响应。观察到对氨的选择性比许多其他化学气体高。这样的阻止特征源自悬浮结构增强反应区域和光激发引起增加的电荷密度，其促进氨检测。增强的感测性能证明了借助光辅助的悬架结构的优越性，该方法可应用于其他基于2D材料的传感器，以优化其性能。

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  • 来源
    《Advanced Functional Materials》 |2018年第20期|1801035.1-1801035.8|共8页
  • 作者

    Chen Huawei; Chen Yantao; Zhang Heng; Zhang David Wei; Zhou Peng; Huang Jia;

  • 作者单位

    Fudan Univ, Sch Microelect, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China;

    Tongji Univ, Sch Mat Sci & Engn, Interdisciplinary Mat Res Ctr, Shanghai 201804, Peoples R China;

    Fudan Univ, Sch Microelect, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Microelect, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China;

    Fudan Univ, Sch Microelect, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China;

    Tongji Univ, Sch Mat Sci & Engn, Interdisciplinary Mat Res Ctr, Shanghai 201804, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    light assistance; suspended SnS2 layers; ultrasensitive ammonia detection;

    机译：光辅助;悬浮的SnS2层;氨超敏检测;

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