Structural and thermal stabilities of Au@Ag core-shell nanoparticles and their arrays: A molecular dynamics simulation

doi:10.1088/1674-1056/ab7da9

Abstract Thermal stability of core-shell nanoparticles (CSNPs) is crucial to their fabrication processes, chemical and physical properties, and applications. Here we systematically investigate the structural and thermal stabilities of single Au@Ag CSNPs with different sizes and their arrays by means of all-atom molecular dynamics simulations. The formation energies of all Au@Ag CSNPs we reported are all negative, indicating that Au@Ag CSNPs are energetically favorable to be formed. For Au@Ag CSNPs with the same core size, their melting points increase with increasing shell thickness. If we keep the shell thickness unchanged, the melting points increase as the core sizes increase except for the CSNP with the smallest core size and a bilayer Ag shell. The melting points of Au@Ag CSNPs show a feature of non-monotonicity with increasing core size at a fixed NP size. Further simulations on the Au@Ag CSNP arrays with 923 atoms reveal that their melting points decrease dramatically compared with single Au@Ag CSNPs. We find that the premelting processes start from the surface region for both the single NPs and their arrays.

Keywords: bimetallic nanoparticles thermal stability melting point

Received: 10 February 2020
Revised: 29 February 2020
Accepted manuscript online:

PACS:	87.10.Tf	(Molecular dynamics simulation)
	68.60.Dv	(Thermal stability; thermal effects)

Fund: Project supported by the National Key Research & Development Project of China (Grant No. 2016YFA0202300), the National Natural Science Foundation of China (Grant No. 61888102), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB30000000), and the Beijing Nova Program of China (Grant No. Z181100006218023).

Corresponding Authors: Shi-Xuan Du
E-mail: sxdu@iphy.ac.cn

Cite this article:

Hai-Hong Jia(贾海洪), De-Liang Bao(包德亮), Yu-Yang Zhang(张余洋), Shi-Xuan Du(杜世萱) Structural and thermal stabilities of Au@Ag core-shell nanoparticles and their arrays: A molecular dynamics simulation 2020 Chin. Phys. B 29 048701

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Structural and thermal stabilities of Au@Ag core-shell nanoparticles and their arrays: A molecular dynamics simulation

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