Unidirectional Thermal Diffusion in Bimetallic Cu@Au Nanoparticles

	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
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
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.
学科主题	Chemistry; Science & Technology - Other Topics; Materials Science
收录类别	SCI
WOS记录号	WOS:000332059200087
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224785]
专题	高能物理研究所_多学科研究中心
推荐引用方式 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.