核壳结构Au@SnO2的制备及其低温下的正丁醇气敏性能  

Preparation of Au@SnO2 Core-Shell Structure and Its n-Butanol Gas Sensing Properties at Low Temperature

作　　者：商震 林志东[1] 郑聚成[2] SHANG Zhen;LIN Zhidong;ZHENG Jucheng(Hubei Key Laboratory of Plasma Chemical and Advanced Materials(Wuhan Institute of Technology),Wuhan 430205,China;Lanzhou Chemical Research Center,China National Petroleum Corporation,Lanzhou 730060,China)

机构地区：[1]等离子体化学与新材料湖北省重点实验室(武汉工程大学),湖北武汉430205 [2]中国石油天然气股份有限公司兰州化工研究中心,甘肃兰州730060

出　　处：《武汉工程大学学报》2020年第5期530-534,共5页Journal of Wuhan Institute of Technology

基　　金：武汉工程大学第十一届研究生教育创新基金(CX2019076)。

摘　　要：以SnCl4·5H2O和HAuCl4·3H2O为原料,以L-半胱氨酸为连接剂,通过水热法制备Au@SnO2核壳结构纳米颗粒。由透射电子显微镜和X射线衍射结果发现二氧化锡(SnO2)与金(Au)颗粒的平均粒径分别为4.9 nm和10.5 nm。SnO2颗粒堆积在Au核表面形成了具有多孔壳结构的复合材料,比表面积达到178.82 m^2/g,总孔隙体积为0.1651 cm^3/g。Au@SnO2核壳结构的存在使得传感器对正丁醇具有优异的气敏性能,在80℃时的灵敏度达到8669.15,检测极限达到3.9×10^-3 g/m^3,显著提高了SnO2的灵敏度,并降低了最佳工作温度。The Au@SnO2 core-shell nanoparticles were prepared by hydrothermal method using SnCl4·5H2O and HAuCl4·3H2O as raw materials and L-cysteine as a linking agent.Transmission electron microscopy and X-ray diffraction results show that the average particle sizes of stannic oxide and gold particles are 4.9 nm and 10.5 nm,respectively.The stannic oxide particles pile up on the surface of the gold core,forming a porous shell structure.The specific surface area of Au@SnO2 reaches 178.82 m^2/g,and the total pore volume is 0.1651 cm^3/g.The presence of Au@SnO2 core-shell structure makes the sensor have excellent gas sensitivity to n-butanol.The sensitivity and the detection limit reach 8669.15 and 3.9×10^-3 g/m^3 respectively at 80℃,which significantly improves the sensitivity of stannic oxide and decreases the optimal operating temperature.

关 键 词：核壳结构 二氧化锡 正丁醇 低温气敏 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]