Abstract
Bimetallic alloy nanoparticles (NPs) are attractive materials for exploring advanced functions to reduce consumption of resources and energy. AuPt alloy NPs are of special interest for their potential applications to fuel cells, because of the reduction of CO poisoning on Pt. Here, we report the synthesis of AuPt alloy NPs by sputter deposition into (N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl) amide (TMPA-TFSA). Transmission electron microscopy (TEM), X-ray fluorescent spectroscopy (XRF) and X-ray diffraction (XRD) measurements showed that changes in particle diameters and compositions of AuPt bimetallic NPs, were controllable by choosing initial compositions of metal targets for the sputter deposition. By cyclic voltammetry measurements, the detection of an anodic peak corresponding to the methanol oxidation reaction on the AuPt NPs demonstrated the presence of an AuPt alloy phase in the NPs.
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