Rapid and selective detection of acetone using hierarchical ZnO gas sensor for hazardous odor markers application
Rapid and selective detection of acetone using hierarchical ZnO gas sensor for hazardous odor markers application
复制标题
使用分层 ZnO 气体传感器快速选择性检测丙酮，用于危险气味标记应用
DOI：
10.1016/j.jhazmat.2014.05.044
复制
发表时间：
2014-07-15
影响因子：
13.6
通讯作者：
Jin, Zhengguo
中科院分区：
文献类型：
--
作者：
Jia, Qianqian;Ji, Huiming;Jin, Zhengguo
采用溶剂热法在200 ℃下反应4 h制备了具有分级结构的ZnO蒲公英状纳米球。产物为纯的六方晶系ZnO，（0 0 2）极性面暴露量大.制备了侧热式分级ZnO微球气敏元件，并对其丙酮气敏特性进行了研究。ZnO传感器对丙酮的检测限为0.25 ppm。对100 ppm丙酮的响应（Ra/Rg）为33，在230 ℃下操作，响应时间短至3秒。该传感器对其它有害气体和水蒸气的响应可忽略不计，具有显著的丙酮选择性。高比例的电子耗尽区和氧空位有助于高的气体响应灵敏度。蒲公英状ZnO球的中空多孔结构有利于气体分子的扩散，导致快速的响应速度。由于（0 0 2）极性面的大面积暴露，丙酮气体分子容易被有效吸附，从而使多层ZnO球气敏元件在低温下具有快速的响应速度和良好的选择性。(C)2014爱思唯尔有限公司版权所有。
Hierarchical nanostructured ZnO dandelion-like spheres were synthesized via solvothermal reaction at 200 degrees C for 4h. The products were pure hexagonal ZnO with large exposure of (0 0 2) polar facet. Side-heating gas sensor based on hierarchical ZnO spheres was prepared to evaluate the acetone gas sensing properties. The detection limit to acetone for the ZnO sensor is 0.25 ppm. The response (Ra/Rg) toward 100 ppm acetone was 33 operated at 230 degrees C and the response time was as short as 3 s. The sensor exhibited remarkable acetone selectivity with negligible response toward other hazardous gases and water vapor. The high proportion of electron depletion region and oxygen vacancies contributed to high gas response sensitivity. The hollow and porous structure of dandelion-like ZnO spheres facilitated the diffusion of gas molecules, leading to a rapid response speed. The largely exposed (0 0 2) polar facets could adsorb acetone gas molecules easily and efficiently, resulting in a rapid response speed and good selectivity of hierarchical ZnO spheres gas sensor at low operating temperature. (C) 2014 Elsevier B.V. All rights reserved.