Hydrogen sensing properties of Pt-Au bimetallic nanoparticles loaded on ZnO nanorods

Abstract The mono-noble metal nanoparticles are often loaded onto the sensing materials to promote the gas sensing performance of the materils; however, there have been few reports concerning the effect of the multi-metallic nanoparticles on the sensing performance. It is reported that the multi-metallic nanoparticles shows different absorption and catalytic performance from their mono-metal analogues because of the geometric and electronic effect, so it is very necessary to investigate the gas sensing performance of the multi-metallic nanoparticles loaded materials. In this work, the Pt-Au alloying nanoparticles was prepared and supported on the ZnO nanorods, and this hybrid was used as the H2 sensor for the first time. The sensing testing results indicate that the alloying nanoparticles loaded ZnO exhibits higher sensing response than the mono-metallic nanoparticles loaded ZnO. The Pt-Au bimetallic nanoparticles loaded ZnO shows high sensitivity to ppm-level of hydrogen even at room temperature, and the sensing response of (Pt-Au)-loaded ZnO to 250 ppm of H2 is 157, 47, and 9.6 times higher than that of pure ZnO, Pt-loaded ZnO, and Au-loaded ZnO, respectively. This superior performance of the (Pt-Au)-loaded ZnO to H2 is most probably due to the strong adsorption of H2 onto the Pt-Au bimetallic nanoparticles caused by the geometric and electronic effects between the two metals.

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