NDLI: Molecular insights into the thermal stability of gold superlattices

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Molecular insights into the thermal stability of gold superlattices

Content Provider	Scilit
Author	Liu, Xuepeng Lu, Pin Zhai, Hua Xie, Fuyuan
Copyright Year	2019
Description	Journal: Nanotechnology Atomistic molecular dynamics simulations are performed to study the thermal stability of bulk superlattices consisting of alkylthiol-coated gold nanocrystals. Using nanocrystals passivated by dodecanethiol chains, we show that the gold superlattice possesses a remarkable high-temperature stability, in agreement with experiment. When heated from room temperature, the superlattice expands slightly at lower temperature (< 500 K) and then exhibits a considerable lattice contraction above 500 K, while maintaining the intact crystal structure up to 710 K. Once the temperature increases above 720 K, the gold superlattice becomes structurally unstable due to the local sintering of adjacent nanocrystals. Continuous heating to 750 K drives a large number of gold nanocrystals to coalesce and finally results in a tremendous destruction of the superstructure. The structural change and instability of superlattice are mainly attributed to the ligand desorption from nanocrystal surface induced by the variation in temperature. Furthermore, longer ligand length can effectively improve the thermal stability of gold superlattices. These findings are expected to provide a deep microscopic understanding of the thermal stability of superlattice materials.
Related Links	https://iopscience.iop.org/article/10.1088/1361-6528/ab546d/pdf
ISSN	09574484
e-ISSN	13616528
DOI	10.1088/1361-6528/ab546d
Journal	Nanotechnology
Issue Number	8
Volume Number	31
Language	English
Publisher	IOP Publishing
Publisher Date	2019-11-05
Access Restriction	Open
Subject Keyword	Journal: Nanotechnology Atomic, Molecular and Chemical Physics Gold Superlattices Thermal Stability of Gold
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Mechanics of Materials Mechanical Engineering Bioengineering Electrical and Electronic Engineering

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