title: Porous iron molybdate nanorods: in situ diffusion synthesis and low-temperature H2S gas sensing.
abstract: In the paper, we developed an in situ diffusion growth method to fabricate porous Fe2(MoO4)3 nanorods. The average diameter and the length of the porous nanorods were 200 nm and 1.2-4 μm, respectively. Moreover, many micropores existed along axial direction of the Fe2(MoO4)3 nanorods. In terms of nitrogen adsorption-desorption isotherms, calculated pore size was in the range of 4-115 nm, agreeing well with the transmission electron microscope observations. Because of the uniquely porous characteristics and catalytic ability at low temperatures, the porous Fe2(MoO4)3 nanorods exhibited very good H2S sensing properties, including high sensitivity at a low working temperature (80 °C), relatively fast response and recovery times, good selectivity, and long-term stability. Thus, the porous Fe2(MoO4)3 nanorods are very promising for the fabrication of high-performance H2S gas sensors. Furthermore, the strategy presented here could be expended as a general method to synthesize other hollow/porous-type transition metal molybdate nanostructures by rational designation in nanoscale.
authors.affiliation: Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University. chenyujin@hrbeu.edu.cn
authors.forename: Yu-Jin
authors.initials: YJ
authors.lastname: Chen
authors.forename: Xin-Ming
authors.initials: XM
authors.lastname: Gao
authors.forename: Xin-Peng
authors.initials: XP
authors.lastname: Di
authors.forename: Qiu-Yun
authors.initials: QY
authors.lastname: Ouyang
authors.forename: Peng
authors.initials: P
authors.lastname: Gao
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Qi
authors.forename: Chun-Yan
authors.initials: CY
authors.lastname: Li
authors.forename: Chun-Ling
authors.initials: CL
authors.lastname: Zhu
mesh_terms: D002384:Catalysis; D003080:Cold Temperature; D004058:Diffusion; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis*; D006862:Hydrogen Sulfide / Q000032:analysis*; D007501:Iron / Q000737:chemistry*; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D016062:Porosity
chemical_list: D004785:Environmental Pollutants; C044659:molybdate; D008982:Molybdenum; D007501:Iron; D006862:Hydrogen Sulfide