期刊
CHEMPHYSCHEM
卷 18, 期 9, 页码 1133-1139出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201601185
关键词
alloys; colloids; high-temperature chemistry; laser chemistry; nanoparticles
资金
- National Basic Research Program of China [2014CB931704]
- National Natural Science Foundation of China (NSFC) [11304315, 51401206, 11404338, 51371166, 51571186, 11504375]
- CAS/SAFEA International Partnership Program for Creative Research Teams
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 FeOx/CoOx/NiOx 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 submicrospheres. 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.
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