title: Rapid and selective detection of acetone using hierarchical ZnO gas sensor for hazardous odor markers application.
abstract: Hierarchical nanostructured ZnO dandelion-like spheres were synthesized via solvothermal reaction at 200°C for 4h. The products were pure hexagonal ZnO with large exposure of (002) 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 0.25ppm. The response (Ra/Rg) toward 100ppm acetone was 33 operated at 230°C and the response time was as short as 3s. 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 (002) 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.
authors.affiliation: Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Jia
authors.affiliation: Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China. Electronic address: jihuiming@tju.edu.cn.
authors.forename: Huiming
authors.initials: H
authors.lastname: Ji
authors.affiliation: Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Yalu
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China. Electronic address: sunxh@tju.edu.cn.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Sun
authors.affiliation: Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Jin
mesh_terms: D000096:Acetone / Q000032:analysis*; D015386:Hazardous Substances; D008854:Microscopy, Electron; D009812:Odorants; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D015386:Hazardous Substances; D000096:Acetone; D015034:Zinc Oxide
keywords: Acetone sensor; Hierarchical nanostructure; Rapid; Selective; ZnO