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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)
2014
Source PublicationACS NANO
ISSN1936-0851
EISSN1936-086X
Volume8Issue:2Pages:1886-1892
AbstractUnderstanding 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.
Keywordunidirectional atomic diffusion core@shell nanoparticle in situ X-ray absorption spectroscopy Cu@Au dilute substitutional intermetallic
Subject AreaChemistry; Science & Technology - Other Topics; Materials Science
DOI10.1021/nn4063825
Indexed BySCI
Language英语
WOS IDWOS:000332059200087
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/224785
Collection多学科研究中心
Recommended Citation
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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