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Laser‐Irradiation‐Induced Melting and Reduction Reaction for the Formation of Pt‐Based Bimetallic Alloy Particles in Liquids
Author(s) -
Han Yechuang,
Wu Shouliang,
Dai Enmei,
Ye Yixing,
Liu Jun,
Tian Zhenfei,
Cai Yunyu,
Zhu Xiaoguang,
Liang Changhao
Publication year - 2017
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201601185
Subject(s) - bimetallic strip , alloy , materials science , irradiation , chemical engineering , metal , catalysis , platinum , phase (matter) , metallurgy , chemistry , organic chemistry , physics , nuclear physics , engineering
Laser melting in liquids (LML) is one of the most effective methods to prepare bimetallic alloys; however, despite being an ongoing focus of research, the process involved in the formation of such species remains ambiguous. In this paper, we prepared two types of Pt‐based bimetallic alloys by LML, including Pt‐Au alloys and Pt‐iron group metal (iM=Fe/Co/Ni) alloys, and investigated the corresponding mechanisms of alloying process. Detailed component and structural characterizations indicate that laser irradiation induced a quite rapid formation process (not exceeding 10 s) of Pt‐Au alloy nanospheres, and the crystalline structures of Pt‐Au alloys is determined by the monometallic constituents with higher content. For Pt‐iM alloys, we provide direct evidence to support the conclusion that FeO x /CoO x /NiO x colloids can be reduced to elementary Fe/Co/Ni particles by ethanol molecules during laser irradiation, which then react with Pt colloids to form Pt‐iM sub‐microspheres. These results demonstrate that LML provides an optional route to prepare Pt‐based bimetallic alloy particles with tunable size, components, and crystalline phase, which should have promising applications in biological and catalysis studies.