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Open Access Preparation of SnO2 nanorods on reduced graphene oxide and sensing properties of as-grown nanocomposites towards hydrogen at low working temperature

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SnO2@reduced graphene oxide (SnO2@rGO) nanocomposites are prepared using a freeze-drying method followed by heat treatment. The structure and morphology of the nanocomposites are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectra, and X-ray photoelectron spectroscopy. A large number of small uniform SnO2 nanorods are successfully anchored on the surface of the rGO nanosheet, and a pn junction is formed at their interface. In addition, the gas-sensing properties of SnO2@rGO are tested using different concentrations of H2 at a low operating temperature of 80 °C. The SnO2@rGO sensor exhibits outstanding gas-sensing properties towards H2, such as fast response and recovery, high sensitivity, selectivity, and stability. The sensor response to 1% H2 at 80 °C was approximately 1.58, and the response and recover times were 15 s and 61 s, respectively. The satisfactory gas-sensing performance can be attributed to the large specific surface area, high electrical conductivity and width of the electron depletion layer. A possible gas-sensing mechanism is also proposed.

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Keywords: FREEZE-DRYING METHOD; GAS SENSOR; HYDROGEN; LOW WORKING TEMPERATURE; RGO; TIN DIOXIDE

Document Type: Research Article

Publication date: June 1, 2018

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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