AuNPs／SnO2／rGO纳米复合物对硫化氢的气敏性能研究  

Study on H_2S gas sensing based on AuNPs/SnO_2/rGO nanocomposites

作　　者：李光耀 肖昊[2] 赵英卓 王煜 肖情 肖忠良 冯泽猛[2] 印遇龙[2] 曹忠 

机构地区：[1]长沙理工大学化学与生物工程学院,电力与交通材料保护湖南省重点实验室,微纳生物传感与食品安全检测协同创新中心,湖南长沙410114 [2]中国科学院亚热带农业生态研究所,湖南长沙410125

出　　处：《化学传感器》2017年第3期24-31,共8页Chemical Sensors

基　　金：中国科学院科技服务网络STS计划(KFJ-SW-STS-173);国家自然科学基金(31527803,21545010)项目资助

摘　　要：以氯化亚锡和氧化石墨烯(GO)为前驱体,经简单的水相路径合成还原氧化石墨烯负载二氧化锡(SnO_2/rGO)复合物,在其表面原位还原氯金酸制得金纳米颗粒/二氧化锡/还原氧化石墨烯(AuNPs/SnO_2/rGO)三元纳米复合物。采用紫外-可见和红外光谱方法表征了所制备的材料。将所制备的AuNPs/SnO_2/rGO涂覆于氧化铝陶瓷管金电极表面,形成一种新型薄膜式硫化氢(H_2S)气体传感器。气敏实验表明,AuNPs/SnO_2/rGO传感器对100 mg/L H_2S的响应是SnO_2/rGO的1.5倍,并且响应速度更快,这可能是金纳米颗粒的催化效应引起的。该传感器在室温下对H_2S具有快的响应-恢复速度,响应、恢复时间分别为34 s和78 s。在25~150mg/L范围内该传感器对H_2S具有良好的线性响应,线性方程可拟合为S(%)=32.22 lg(c/(mg/L))-35.42,相关系数为0.9940,而且该气敏传感器具有良好的重复性、重现性和稳定性。In this study, reduced graphene oxide supported tin dioxide composites （SnOJrGO） was synthesized through a simple aqueous phase route using stannous chloride and graphene oxide （GO） as precursors, and then Au nanoparticles/tin dioxide/reduced graphene oxide （AuNPs/SnOJrGO） temary nanocomposites were prepared by in situ reduction of HAuC14 on the surface of SnOJrGO. The as-synthesized nanomaterials were characterized by UV- Visible and FTIR spectroscopy. The as-prepared AuNPs/SnO2/rGO was coated on the surface of the alumina ceramic tube to form a novel thin film hydrogen sulfide （H2S） gas sensor. The results of gas-sensing test showed that the response of AuNPs/SnO2/rGO gas sensor was 1.5 times of that of SnOJrGO to 100 mg/L H2S, and the response speed was much faster, which may be due to the catalytic effect of AuNPs. The gas sensor had a response-recovery rate for H2S at room temperature, and the response and recovery time were 34 s and 78 s, respectively. The response linear range to H2S was from 25 to 150 mg/L, that the linear equation can be fitted as S （%） = 32.22 x lg （c/（mg/L））-35.42, and the correlation coefficient was 0.9940. Moreover, the gas sensor had good repeatability, reproducibility and stability for practical application.

关 键 词：氧化石墨烯 AuNPs/SnO2/rGO i元纳米复合物 硫化氢 气体传感器 

分 类 号：TB33[一般工业技术—材料科学与工程] TP212[自动化与计算机技术—检测技术与自动化装置]