The naked-eye NH3 sensor based on fluorinated graphene
The naked-eye NH3 sensor based on fluorinated graphene
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基于氟化石墨烯的裸眼NH3传感器
DOI：
10.1016/j.snb.2018.11.018
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发表时间：
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期刊：
影响因子：
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通讯作者：
Dawei Cao
中科院分区：
文献类型：
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作者：
Yuan Liu;Tian-Tian Shi;Tao Chen;Wei-Jia He;Ming-Ming Chen;Dawei Cao
石墨烯因其独特的性质在气敏领域的应用引起了人们的极大兴趣。然而，石墨烯基传感器仍存在器件制作不方便、持续供电、测量设备特殊等局限性。在此，我们发现氟化石墨烯（FG）在NH3存在下表现出明显的颜色变化（从白色到深黄色），这可以用肉眼直接观察到。光致发光测试表明，该材料的变色灵敏度可达约100nm。4.05% ppm−1。密度泛函理论计算结果表明，FG表面的F原子增加了NH3分子的吸附能力和电荷转移，导致了高效的变色。本工作开发了一种无需器件制作、电源和测量设备的裸眼传感器，从而有可能用于制造廉价、灵敏和小型化的NH3传感器。
Graphene has aroused continual and tremendous interest in gas sensing applications because of its unique properties. However, the graphene-based sensors still meet limitations such as inconvenient device fabrication, sustained power supply, specific measuring equipment,etc.Here, we find that fluorinated graphene (FG) shows an obvious color change (from white to dark yellow) in the presence of NH3which can be observed directly by the naked eye. PL measurement shows that the sensitivity of color change can reach a high value of ca. 4.05% ppm−1. The density functional theory calculations reveal that the F atoms on FG increase the adsorption ability and charge transfer of NH3molecules, resulting in the efficient color change. This work develops a naked-eye sensor which needs no device fabrication, power supply or measuring equipment, thus, can be potentially used to manufacture a cheap, sensitive and miniaturized NH3sensor.