Highly sensitive acetone-sensing properties of Pt-decorated CuFe2O4 nanotubes prepared by electrospinning |
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| Authors: | Changhui Zhao Weizong Lan Huimin Gong Jinglong Bai Rajendran Ramachandran Sheng Liu Fei Wang |
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| Affiliation: | 1. Department of Electronic and Electrical Engineering, Southern University of Science and Technology, Shenzhen 518055, China;2. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;3. Shenzhen Key Laboratory of 3rd Generation Semiconductor Devices, Shenzhen 518055, China;4. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;5. State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China |
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| Abstract: | Pristine and Pt-decorated copper ferrite nanotubes (Pt-CuFe2O4 NTs, 0.1%, 0.5%, and 1.0%, mole percent) were prepared by a simple electrospinning method. The samples were characterized by X-ray diffraction, scanning electron microscope, and transmission electron microscope. Their gas-sensing properties were evaluated by a commercial CGS-4TPs system. Microscopic images showed that all samples consisted of well-defined nanotubes with diameter of 70?100 nm. Gas-sensing measurements revealed that the Pt-CuFe2O4 NTs had an improved acetone-sensing properties compared with pristine CuFe2O4 NTs. In particular, 0.5% Pt-CuFe2O4 NT-based sensor showed a high response (16.5 at 100 ppm), good selectivity, and long-term stability for acetone at 300 °C. In addition, more Pt dopants would have a greater effect on promoting the sensing properties of the CuFe2O4 NTs at high acetone concentrations. A gas-sensing enhancement mechanism of Pt-CuFe2O4 NT-based sensors was proposed, according to the catalytic oxidation process of acetone molecules, which could be due to the kinetic competition between Pt dopants and CuFe2O4 NTs. |
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| Keywords: | Electrospinning Acetone sensor Gas-sensing mechanism |
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