期刊
TALANTA
卷 199, 期 -, 页码 603-611出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2019.03.014
关键词
SnO2 nanoflowers; WO3-SnO2 nanostructures; Impregnation method; Methane; Gas sensor
资金
- National Natural Science Foundation of China [U1704255]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [19HASTIT042, 18HASTIT010, 17HASTIT029]
- Fundamental Research Funds for the Universities of Henan Province [NSFRF1606, NSFRF1614, NSFRF170201]
- Research Foundation for Youth Scholars of Higher Education of Henan Province [2017GGJS053, 2016GGJS-040]
- Program for Innovative Research Team of Henan Polytechnic University [T2018-2]
- Foundation for Distinguished Young Scientists of Henan Polytechnic University [J2017-3]
The three-dimensional (3D) hierarchical WO3-SnO2 nanoflowers (NFs) composites were successfully synthesized via a simple impregnation method by using WO3 and SnO2 prepared by hydrothermal method as precursors. The structure and morphology of the as-prepared samples were investigated by the techniques of X-ray diffraction (XRD), field-emission electron scanning microscopy (FESEM), transmission electron microscopy (TEM) and N2 sorption. These results indicated that SnO2 and WO3-SnO2 nanostructures with a diameter of about 500 nm self assembled by numerous nanorods of about 200 nm in length. Gas sensing test results show that the nanostructure W03-SnO2 nanocomposites possess better methane sensing properties than that of pure SnO2. The modification of W03 nanoplates reduces the optimum working temperature of SnO2 based sensor from 120 degrees C to 110 C, the response of W03-SnO2 based sensor to 500 ppm methane at 110 C is 2.3 times of that of pure SnO2 based sensor. In addition, the W03-SnO2 based sensor possesses lower detection limit, good repeatability and stability. The improved gas-sensing mechanism of the nanocomposite based sensors for methane detection is also discussed in detail.
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