Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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A Comparative Study of Gas Sensing Properties of Au-loaded ZnO and Au@ZnO Core-shell Nanoparticles

  • Majhi, Sanjit Manohar (Division of Advanced Materials Engineering and Research Centre for Advanced Materials Development, Chonbuk National University) ;
  • Dao, Dung Van (Division of Advanced Materials Engineering and Research Centre for Advanced Materials Development, Chonbuk National University) ;
  • Lee, Hu-Jun (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 : 2018.01.18
  • Accepted : 2018.02.18
  • Published : 2018.03.31
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Abstract

Au@ZnO core-shell nanoparticles (NPs) were prepared by a simple method followed by heat-treatment for gas sensor applications. The advantage of the core-shell morphology was investigated by comparing the gas sensing performances of Au@ZnO core-shell NPs with pure ZnO NPs and different wt% of Au-loaded ZnO NPs. The crystal structures, shapes, sizes, and morphologies of all sensing materials were characterized by XRD, TEM, and HAADF-STEM. Au@ZnO core-shell NPs were nearly spherical in shape and Au NPs were encapsulated in the center with a 40-45 nm ZnO shell outside. The gas sensing operating temperature for Au@ZnO core-shell NPs was $300^{\circ}C$, whereas it was $350^{\circ}C$ for pure ZnO NPs and Au-loaded ZnO NPs. The maximum response of Au@ZnO core-shell NPs to 1000 ppm CO at $300^{\circ}C$ was 77.3, which was three-fold higher than that of 2 wt% Au-loaded ZnO NPs. Electronic and chemical effects were the primary reasons for the improved sensitivity of Au@ZnO core-shell NPs. It was confirmed that Au@ZnO core-shell NPs had better sensitivity and stability than Au-loaded ZnO NPs.

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References

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