Porous Iron Molybdate Nanorods: In situ Diffusion Synthesis and Low-Temperature H2S Gas Sensing

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• 作者：Yu-Jin Chen ; Xin-Ming Gao ; Xin-Peng Di ; Qiu-Yun Ouyang ; Peng Gao ; Li-Hong Qi ; Chun-Yan Li ; Chun-Ling Zhu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：April 24, 2013
• 年：2013
• 卷：5
• 期：8
• 页码：3267-3274
• 全文大小：565K
• 年卷期：v.5,no.8(April 24, 2013)
• ISSN：1944-8252

文摘

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鈥? 渭m, respectively. Moreover, many micropores existed along axial direction of the Fe₂(MoO₄)₃ nanorods. In terms of nitrogen adsorption鈥揹esorption isotherms, calculated pore size was in the range of 4鈥?15 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 掳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.

Keywords:

Iron molybdate; porous nanostructure; diffusion growth; gas sensor; low-temperature sensing