Synthesis of Au@TiO2 Core-shell Nanoparticle-decorated rGO Nanocomposite and its NO2 Sensing Properties
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초록
Au@TiO2 core-shell decorated rGO nanocomposite (NC) was prepared using a simple solvothermal method followed by heat treat- ment for gas sensor application. The crystal structure and morphology of the composites were characterized by X-ray powder diffractionand transmission electron microscopy, respectively. The NO2 sensing response of the Au@TiO2/rGO NC was tested at operating tem- peratures from 250°C to 500°C, and was compared with those of the bare rGO and Au@TiO2 core-shell NPs. The Au@TiO2/rGO NC-based sensor showed a far higher response than the rGO or Au@TiO2 core-shell based sensors, with the maximum response detectedwhen the operating temperature was 400°C. This improved response was due to the high rGO gas absorption capability for NO2 gas and the catalytic effect of Au@TiO2 core-shell NPs in oxidizing NO2 to NO3.
Abstract
Au@TiO2 core-shell decorated rGO nanocomposite (NC) was prepared using a simple solvothermal method followed by heat treat- ment for gas sensor application. The crystal structure and morphology of the composites were characterized by X-ray powder diffractionand transmission electron microscopy, respectively. The NO2 sensing response of the Au@TiO2/rGO NC was tested at operating tem- peratures from 250°C to 500°C, and was compared with those of the bare rGO and Au@TiO2 core-shell NPs. The Au@TiO2/rGO NC-based sensor showed a far higher response than the rGO or Au@TiO2 core-shell based sensors, with the maximum response detectedwhen the operating temperature was 400°C. This improved response was due to the high rGO gas absorption capability for NO2 gas and the catalytic effect of Au@TiO2 core-shell NPs in oxidizing NO2 to NO3.
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