A Comparative Study of Gas Sensing Properties of Au-loaded ZnO and Au@ZnO Core-shell Nanoparticles
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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 sensingmaterials were characterized by XRD, TEM, and HAADF-STEM. Au@ZnO core-shell NPs were nearly spherical in shape and Au NPswere encapsulated in the center with a 40–45 nm ZnO shell outside. The gas sensing operating temperature for Au@ZnO core-shellNPs was 300°C, whereas it was 350°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°C was 77.3, which was three-fold higher than that of 2 wt% Au-loaded ZnO NPs. Electronic and chemicaleffects were the primary reasons for the improved sensitivity of Au@ZnO core-shell NPs. It was confirmed that Au@ZnO core-shellNPs had better sensitivity and stability than Au-loaded ZnO NPs.
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 sensingmaterials were characterized by XRD, TEM, and HAADF-STEM. Au@ZnO core-shell NPs were nearly spherical in shape and Au NPswere encapsulated in the center with a 40–45 nm ZnO shell outside. The gas sensing operating temperature for Au@ZnO core-shellNPs was 300°C, whereas it was 350°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°C was 77.3, which was three-fold higher than that of 2 wt% Au-loaded ZnO NPs. Electronic and chemicaleffects were the primary reasons for the improved sensitivity of Au@ZnO core-shell NPs. It was confirmed that Au@ZnO core-shellNPs had better sensitivity and stability than Au-loaded ZnO NPs.
참고문헌 (23)
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