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. 2020 Apr 7;8:244. doi: 10.3389/fchem.2020.00244

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Copyright © 2020 Nie, Ga, Ai and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) XRD pattern of PdCuAu NPs, the standard patterns of pure Au (JCPDS card no. 04-0784), Pd (JCPDS card no. 46-1043) and Cu (JCPDS card no. 04-0836) are shown for comparison. (B) FT-IR spectra of pure PVP, CuAu, PdAu, PdCu, and PdCuAu NPs. (C) X-ray photoelectron spectroscopy spectra of Pd 3d, Cu 2p, and Au 4f of the as-prepared PdCuAu NPs.