基于PANI/RGO纳米复合材料的高灵敏度无线NH3传感器

Highly Sensitive Wireless NH3 Sensor Based on PANI/RGO Nanocomposite

采用导电聚苯胺/还原氧化石墨烯(PANI/RGO)纳米复合材料作为气体敏感层,通过场发射扫描电子显微镜(FE-SEM)分析了敏感材料的表面形貌。并将这种复合纳米材料与近场通信(NFC)标签相结合制造出无线氨气(NH3)传感器。研究结果表明,与纯PANI相比,PANI/RGO复合传感器具有优良的气体传感性能。在NH3体积分数为1×10^-5时,该NH3传感器的快速响应时间为50 s,恢复时间为58 s。当NH3体积分数为1×10^-5~5×10^-5时,该传感器的灵敏度为24%,当NH3体积分数增大为5×10^-5~2×10^-4时传感器的灵敏度为4%。同时研究了传感器对体积分数均为5×10^-5的NH3、甲醇、乙醇、丙酮和己烷的响应,结果表明该传感器对NH3有更好的选择性。并对其进行反复测试发现该传感器具有很好的重复性和稳定性。该传感器在NH3检测方面具有广阔的应用前景。

With the conductive polyaniline/reduced graphene oxide(PANI/RGO)nanocomposite as the gas sensitive layer,the surface morphology of the sensitive material was analyzed by the field emission scanning electron microscope(FE-SEM).By combining the nanocomposite with near field communication(NFC)tags,a wireless NH3 sensor was fabricated.The study results show that compared with the pure PANI,the PANI/RGO composite sensor has excellent gas sensing performance.When the NH3 volume fraction is 1×10^-5,the NH3 sensor has fast response time of 50 s and recovery time of 58 s.When the NH3 volume fraction is 1×10^-5-5×10^-5,the sensitivity of the sensor is 24%.The sensitivity of the sensor is 4%when the NH3 volume fraction increases to 5×10^-5-2×10^-4.Meanwhile,the responses of the sensor to NH3,methanol,ethanol,acetone and hexane with volume fractions of 5×10^-5 were studied.The results show that the sensor has better selectivity for NH3.It is found that the sensor has good repeatability and stability after repeated testing.The sensor has a wide application prospect in NH3 detection.