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Hierarchical Radial Co3O4 Microcrystal and Application in Gas Sensor
Xin-xin Yu,Xian-song Liu,Ming-zai Wu*,Zhao-qi Sun,Guang Li,Xiao-shuang Chen
Author NameAffiliationE-mail
Xin-xin Yu School of Physics and Materials Science, Anhui University, Hefei 230039, China  
Xian-song Liu School of Physics and Materials Science, Anhui University, Hefei 230039, China  
Ming-zai Wu* School of Physics and Materials Science, Anhui University, Hefei 230039, China mingzaiwu@gmail.com 
Zhao-qi Sun School of Physics and Materials Science, Anhui University, Hefei 230039, China  
Guang Li School of Physics and Materials Science, Anhui University, Hefei 230039, China  
Xiao-shuang Chen The Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China  
Abstract:
Three-dimensional (3D) hierarchical Co3O4 microcrystal with radial dendritic morphologies was prepared through hydrothermal reactions followed by subsequent annealing treatment. Structural and morphological characterizations were performed by X-ray diffraction, scan-ning electron microscopy and transmission electron microscopy. The gas sensing properties of the as-obtained microcrystal were investigated at 110 oC, which revealed that the 3D hierarchical porous Co3O4 microcrystal exhibited high sensitivity to ammonia, as well as a short response time of 10 s. The response characteristic indicates that the sensor has a good stability and reversibility. Detections of toxic and flammable gases, such as ethanol, acetone and benzene were also carried out at a relative low temperature. The results indicate that such hierarchical Co3O4 microcrystal would be a potential material in the field of gas sensing.
Key words:  Co3O4, Hierarchical, Gas sensor, Sensitivity
FundProject:
径向生长的具有分级结构的四氧化三钴微晶及其在气体传感上的应用
于欣欣,刘先松,吴明在*,孙兆奇,李广,陈效双
摘要:
通过在水热合成后追加退火处理,制备了径向生长的具有分级结构的树枝状三维Co3O4晶体,并用X射线衍射仪、扫描电子显微镜和透射电子显微镜对其结构和形貌进行了表征. 在110 oC对其气体探测性能的研究表明这种Co3O4分级结构对氨气有较高的探测灵敏度和响应速度(10 s),性能稳定并具有可重复性. 同时,还在较低的探测温度下对酒精、丙酮和苯进行了气敏探测.
关键词:  Co3O4,分级,气体传感,灵敏度
DOI:10.1063/1674-0068/27/01/99-102
分类号: