Control of crystallographic phases and surface characterization of intermetallic platinum tin nanoparticles
Control of crystallographic phases and surface characterization of intermetallic platinum tin nanoparticles
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金属间铂锡纳米颗粒的晶相控制和表面表征
DOI:
10.1039/c9ce00356h
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发表时间:
2019
期刊:
影响因子:
3.1
通讯作者:
J. Kolny-Olesiak
中科院分区:
文献类型:
--
作者:
A. Erdt;C. Gutsche;U. E. A. Fittschen;H. Borchert;J. Parisi;J. Kolny-Olesiak
Tin-rich platinum–tin intermetallic nanoparticles are important catalytic materials. However, their synthesis is still a challenging task. Here, we present an approach to stable, colloidal tin-rich nanoparticles such as PtSn2 and PtSn4 by the reduction of a tin precursor in the presence of preformed platinum seeds. By varying both the size of the platinum seeds and the amount of the tin precursor, we obtain different, colloidally stable, intermetallic platinum–tin phases, such as PtSn, as well as tin-rich PtSn2 and PtSn4. The resulting, quasi-spherical particles have uniform morphology and narrow size distribution. X-ray diffraction (XRD), total reflection X-ray fluorescence (TXRF) and energy dispersive X-ray (EDX) spectroscopy reveal that all samples are intermetallic instead of random alloys. Furthermore, these measurements provide hints that the surface layer composition differs from that of the core. Therefore, X-ray photoelectron spectroscopy (XPS) measurements were conducted, confirming the presence of a thin tin oxide shell around the particles due to oxidation after exposure to air. In consequence, a crystalline platinum-rich layer forms on top of the core of these nanocrystallites. The detailed structure of this phase was studied by high-resolution transmission electron microscopy (HRTEM).
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影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2013
期刊:
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通讯作者:
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DOI:
--
发表时间:
2006
期刊:
影响因子:
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作者:
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