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• W2247154801 endingPage "040704" @default.
• W2247154801 startingPage "040704" @default.
• W2247154801 abstract "Hexagonal WO3 nanorods are fabricated by a facile hydrothermal process at 180 °C using sodium tungstate and sodium chloride as starting materials. The morphology, structure, and composition of the prepared nanorods are studied by scanning electron microscopy, X-ray diffraction spectroscopy, and energy dispersive spectroscopy. It is found that the agglomeration of the nanorods is strongly dependent on the PH value of the reaction solution. Uniform and isolated WO3 nanorods with diameters ranging from 100 nm–150 nm and lengths up to several micrometers are obtained at PH = 2.5 and the nanorods are identified as being hexagonal in phase structure. The sensing characteristics of the WO3 nanorod sensor are obtained by measuring the dynamic response to NO2 with concentrations in the range 0.5 ppm–5 ppm and at working temperatures in the range 25 °C–250 °C. The obtained WO3 nanorods sensors are found to exhibit opposite sensing behaviors, depending on the working temperature. When being exposed to oxidizing NO2 gas, the WO3 nanorod sensor behaves as an n-type semiconductor as expected when the working temperature is higher than 50 °C, whereas, it behaves as a p-type semiconductor below 50 °C. The origin of the n- to p-type transition is correlated with the formation of an inversion layer at the surface of the WO3 nanorod at room temperature. This finding is useful for making new room temperature NO2 sensors based on hexagonal WO3 nanorods." @default.
• W2247154801 created "2016-06-24" @default.
• W2247154801 creator A5030137204 @default.
• W2247154801 creator A5053624960 @default.
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• W2247154801 date "2014-04-01" @default.
• W2247154801 modified "2023-10-02" @default.
• W2247154801 title "A study of transition from n- to p-type based on hexagonal WO₃nanorods sensor" @default.
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• W2247154801 doi "https://doi.org/10.1088/1674-1056/23/4/040704" @default.
• W2247154801 hasPublicationYear "2014" @default.
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