Preparation of SnO2 nanorods on reduced graphene oxide and sensing properties of as-grown nanocomposites towards hydrogen at low working temperature
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 p–n 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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Document Type: Research Article
Publication date: June 1, 2018
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