Unidirectional Thermal Diffusion in Bimetallic Cu@Au Nanoparticles
Liu, SJ; Sun, ZH; Liu, QH; Wu, LH; Huang, YY; Yao, T; Zhang, J; Hu, TD; Ge, MR; Hu, FC; Xie, Z; Pan, GQ; Wei, SQ;张静; Hu TD(胡天斗)
刊名ACS NANO
2014
卷号8期号:2页码:1886-1892
关键词unidirectional atomic diffusion core@shell nanoparticle in situ X-ray absorption spectroscopy Cu@Au dilute substitutional intermetallic
学科分类Chemistry; Science & Technology - Other Topics; Materials Science
DOI10.1021/nn4063825
英文摘要Understanding the atomic diffusions at the nanoscale is important for controlling the synthesis and utilization of nanomaterials. Here, using in situ X-ray absorption spectroscopy coupled with theoretical calculations, we demonstrate a so far unexplored unidirectional diffusion from the Au shell to the Cu core in thermally alloying Cu@Au core@shell architecture of ca. 7.1 nm. The initial diffusion step at 423 K is found to be characterized by the formation of a diffusion layer composed of a Au-dilute substitutional CuAu-like intermetallic compound with short Cu Au bond length (2.61 angstrom). The diffusion further happens by the migration of the Au atoms with large disorder into the interior Cu matrix at higher temperatures (453 and 553 K). These results suggest that the structural preference of a CuAu-like compound, along with the nanosized effect, plays a critical role in determining the atomic diffusion dynamics.
收录类别SCI
WOS记录号WOS:000332059200087
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被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224785
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
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GB/T 7714
Liu, SJ,Sun, ZH,Liu, QH,et al. Unidirectional Thermal Diffusion in Bimetallic Cu@Au Nanoparticles[J]. ACS NANO,2014,8(2):1886-1892.
APA Liu, SJ.,Sun, ZH.,Liu, QH.,Wu, LH.,Huang, YY.,...&胡天斗.(2014).Unidirectional Thermal Diffusion in Bimetallic Cu@Au Nanoparticles.ACS NANO,8(2),1886-1892.
MLA Liu, SJ,et al."Unidirectional Thermal Diffusion in Bimetallic Cu@Au Nanoparticles".ACS NANO 8.2(2014):1886-1892.
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