多孔SnO2空心球材料的合成及甲醛气敏性能研究  

Synthesis of Porous SnO2 Hollow Sphere Materials and Gas Sensing Properties of Formaldehyde

作　　者：李娜 向群[1] 程知萱[1] 王晓红[1] 徐甲强[1] LI Na;XIANG Qun;CHENG Zhixuan;WANG Xiaohong;XU Jiaqiang(Department of Chemistry,College of Science,Shanghai University,Shanghai 200444,China;Department of Fundamental Education,Shanghai Civil Aviation College,Shanghai 200232,China)

机构地区：[1]上海大学理学院化学系,上海200444 [2]上海民航职业技术学院基础教学部,上海200232

出　　处：《郑州大学学报（工学版）》2019年第6期27-31,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(61671284,U1704255)

摘　　要：针对目前气敏材料制备工艺繁琐且对甲醛灵敏度不高的现状,通过调控乙醇与水的配比来制备合成多孔SnO2空心球材料并用于低浓度甲醛的检测,通过XRD、SEM以及TEM等测试仪器对材料的结构和形貌进行了表征.当乙醇与水的体积比为3.0∶5.0时,制备得到的多孔SnO2空心球生长均匀,直径约为400 nm.气敏测试结果表明:SnO2空心球材料的最佳工作温度为210℃,对50 mg/L甲醛的响应值可达到52.5,响应时间和恢复时间分别为14 s和33 s,且对其他气体的响应值较低;并对该材料在甲醛浓度为1~50 mg/L时进行了连续测试,计算得到最低检测限低至20μg/L,表明其可用于低浓度甲醛的检测.In view of the current cumbersome preparation process and the low sensitivity to formaldehyde of gas sensing materials,this paper mainly prepared synthetic porous SnO2 hollow sphere materials by using the ratio of ethanol to water to detect the low concentration formaldehyde.The structure and morphology of the materials were characterized by XRD,SEM and TEM.When the volume ratio of ethanol to water was 3.0∶5.0,the prepared porous SnO2 hollow spheres grew uniformly and with a diameter of about 400 nm.The gas sensitivity test results showed that the optimum operating temperature of SnO2 hollow sphere material was 210℃,the response value to 50 mg/L formaldehyde could reach 52.5,the response and recovery time were 14 s and 33s,and the response value to other gases was lower.The material was also tested continuously in the range of formaldehyde concentration range of 1~50 mg/L,the lowest detection limit was calculated to be as low as 20μg/L,indicating that it could be used for the detection of low concentration formaldehyde.

关 键 词：甲醛 空心球 多孔 SNO2 气体传感器 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]