Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Synthesis of Au@TiO2 Core-shell Nanoparticle-decorated rGO Nanocomposite and its NO2 Sensing Properties

  • Kumar Naik, Gautam (Division of Advanced Materials Engineering and Research Centre for Advanced Materials Development, Chonbuk National University) ;
  • Yu, Yeon Tae (Division of Advanced Materials Engineering and Research Centre for Advanced Materials Development, Chonbuk National University)
  • Received : 2019.07.19
  • Accepted : 2019.07.31
  • Published : 2019.07.31
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Abstract

$Au@TiO_2$ core-shell decorated rGO nanocomposite (NC) was prepared using a simple solvothermal method followed by heat treatment for gas sensor application. The crystal structure and morphology of the composites were characterized by X-ray powder diffraction and transmission electron microscopy, respectively. The $NO_2$ sensing response of the $Au@TiO_2/rGO$ NC was tested at operating temperatures from $250^{\circ}C$ to $500^{\circ}C$, and was compared with those of the bare rGO and $Au@TiO_2$ core-shell NPs. The $Au@TiO_2/rGO$ NC-based sensor showed a far higher response than the rGO or $Au@TiO_2$ core-shell based sensors, with the maximum response detected when the operating temperature was $400^{\circ}C$. This improved response was due to the high rGO gas absorption capability for $NO_2$ gas and the catalytic effect of $Au@TiO_2$ core-shell NPs in oxidizing $NO_2$ to $NO_3$.

Keywords

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Fig. 1. Schematic diagram of gas sensing measurement setup

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Fig. 2. TEM image of Au@TiO2/rGO NC.

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Fig. 3. XRD patterns for rGO and Au@TiO2/rGO NC.

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Fig. 4. Resistance changes to various NO2 gas concentrations for bare rGO and Au@TiO2 core-shell NPs at 400℃.

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Fig. 5. Resistance changes to various NO2 gas contents for Au@TiO2/rGO NC, at different operating temperatures.

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Fig. 6. Plot of response vs. operating temperature at different NO2 concentration for Au@TiO2/rGO NC.

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Fig. 7. Plot of response vs. NO2 concentration at different operating temperature for Au@TiO2/rGO NC.

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