High-Performance Wireless Ammonia Gas Sensors Based on Reduced Graphene Oxide and Nano-Silver Ink Hybrid Material Loaded on a Patch Antenna.
High-Performance Wireless Ammonia Gas Sensors Based on Reduced Graphene Oxide and Nano-Silver Ink Hybrid Material Loaded on a Patch Antenna.
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贴片天线上基于还原氧化石墨烯和纳米银墨水混合材料的高性能无线氨气传感器
DOI：
10.3390/s17092070
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发表时间：
2017-09-09
期刊：
影响因子：
--
通讯作者：
Chen H
中科院分区：
文献类型：
--
作者：
Wu B;Zhang X;Huang B;Zhao Y;Cheng C;Chen H
研究了还原氧化石墨烯(RGO)在室温下作为阻性氨气传感器的性能。将rGO和纳米银墨水组成的灵敏杂化材料(银墨水)加载到微带贴片天线上，实现了高性能的无线氨气传感器。用扫描电子显微镜(SEM)和X射线光电子能谱(XPS)对材料进行了表征。首先，采用直接印刷法在聚对苯二甲酸乙二醇酯(PET)上印刷的叉指电极(IDES)测量了敏感材料的电阻随氨浓度的变化。结果表明，在15~200ppm的氨浓度范围内，传感器的响应度为4.25%~14.7%。此外，将杂化材料加载到采用传统印刷电路板(PCB)工艺制造的微带贴片天线上，在200ppm的氨气中可以观察到传感器天线的10 MHz频移。最后，在气室外使用相同的发射天线成功地测试了传感器天线的无线传感特性，获得了5.48dBI的高增益，并观察到由于传感器天线的频率失配，发射天线的反射幅度增加。因此，加载在贴片天线上的无线氨气传感器在物联网领域具有重要的应用前景。
Reduced graphene oxide (rGO) has been studied as a resistive ammonia gas sensor at room temperature. The sensitive hybrid material composed of rGO and nano-silver ink (Ag-ink) was loaded on a microstrip patch antenna to realize high-performance wireless ammonia sensors. The material was investigated using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Firstly, interdigital electrodes (IDEs) printed on the polyethylene terephthalate (PET) by direct printing were employed to measure the variation of resistance of the sensitive material with the ammonia concentration. The results indicated the response of sensor varied from 4.25% to 14.7% under 15–200 ppm ammonia concentrations. Furthermore, the hybrid material was loaded on a microstrip patch antenna fabricated by a conventional printed circuit board (PCB) process, and a 10 MHz frequency shift of the sensor antenna could be observed for 200 ppm ammonia gas. Finally, the wireless sensing property of the sensor antenna was successfully tested using the same emitted antenna outside the gas chamber with a high gain of 5.48 dBi, and an increased reflection magnitude of the emitted antenna due to the frequency mismatch of the sensor antenna was observed. Therefore, wireless ammonia gas sensors loaded on a patch antenna have significant application prospects in the field of Internet of Things (IoTs).
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