基于金纳米颗粒的化学电阻传感器检测苯类气体  

Detection of Monoaromatic Hydrocarbons Gas with Chemi-resistance Sensor Based on Gold Nanoparticles

作　　者：唐嫒尧 李鑫[1,2] 李明虓 程洁 黄成军 TANG Ai-yao;LI Xin;LI Ming-xiao;CHENG Jie;HUANG Cheng-jun(R&D Center of Healthcare Electronics,Institute of Microelectronics of Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 101400,China)

机构地区：[1]中国科学院微电子研究所健康电子研发中心,北京100029 [2]中国科学院大学,北京101400

出　　处：《仪表技术与传感器》2022年第1期11-18,共8页Instrument Technique and Sensor

基　　金：国家重点研发计划项目(2020YFC2004503);北京市科技新星计划项目(Z20110000682083)。

摘　　要：为提高气体传感器对苯系物的选择性,文中通过Au-S键的自组装作用和滴铸法制备了4-甲氧基苄硫醇(MTT)修饰的金纳米颗粒(AuNPs)化学电阻传感器,用扫描电子显微镜(SEM)对其微观形貌进行了表征。设计了气体检测平台和数据采集系统,并对传感器的气敏性能进行了检测,结果显示:基于MTT功能化的AuNPs化学电阻传感器对苯类气体(甲苯、苯甲醛等)具有明显的吸附选择性,在室温条件下,可对体积分数低至5×10^(-8)的甲苯/苯甲醛气体产生响应,灵敏度分别为5.06×10^(-3)和3.46×10^(-3),响应/恢复时间随被测气体体积分数的增大逐渐减小,平均响应/恢复时间为(80.0±17.3)s/(117.1±30.0)s。A chemi-resistance sensor was constructed by preparing 4-methoxy-α-toluenethiol(MTT)modified gold nanoparticles(AuNPs)through the self-assembly of Au-S bonds and drop casting method to improve the selectivity of gas sensors to monoaromatic hydrocarbons(MACHs).The micro morphology of the chemi-resistance sensor was characterized by scanning electron microscope(SEM),and a gas detection platform and data acquisition system was designed to detect the gas sensing properties of the sensors.The results indicate that the chemi-resistance sensor functionalized with MTT has obvious adsorption selectivity for MACHs,such as toluene,benzaldehyde,etc.At room temperature,the sensor can respond to toluene/benzaldehyde gas as low as 5×10^(-8),the sensitivities are 5.06×10^(-3) and 3.46×10^(-3),respectively.The response/recovery time of the sensor gradually decreases with the increase of the measured gas volume fraction,and the average response/recovery time is(80.0±17.3)s/(117.1±30.0)s,respectively.

关 键 词：金纳米颗粒 自组装 吸附 气体传感器 污染 

分 类 号：TH89[机械工程—仪器科学与技术] TH704[机械工程—精密仪器及机械]