BROWSE

Related Scientist

Cho, Ho Duk's photo.

Cho, Ho Duk
나노물질 및 화학반응 연구단
more info

ITEM VIEW & DOWNLOAD

Atomic Scale Mechanisms Underlying Thermal Reshaping of Anisotropic Gold Nanocrystals Revealed by in Situ Electron Microscopy

Cited 0 time in webofscience Cited 0 time in scopus
49 Viewed 0 Downloaded
Title
Atomic Scale Mechanisms Underlying Thermal Reshaping of Anisotropic Gold Nanocrystals Revealed by in Situ Electron Microscopy
Author(s)
Hoduk Cho; Jae Won Shin; Ryong Ryoo
Publication Date
2020-06
Journal
Journal of Physical Chemistry C, v.124, no.23, pp.12855 - 12863
Publisher
American Chemical Society
Abstract
Understanding the shape transformation processes of anisotropic nanocrystals is an essential step toward fully exploiting their remarkable shape-dependent properties. Here, we employ environmental transmission electron microscopy with controlled heating to directly visualize the thermal reshaping dynamics of gold nanorods and triangular nanoplates at the atomic level. Upon heating above 180 °C in 1 mbar of oxygen, thiol ligand molecules that are stabilizing these metastable nanostructures desorb to allow the subsequent migration of surface atoms. As a consequence, nanorods undergo rounding into ellipsoids, with indiscriminate surface migration of vertex atoms to the sides being mediated by the development of multiple high-index facets. By contrast, triangular nanoplates exhibit truncation of their vertices, which proceeds via selective layer-by-layer migration of vertex atoms to the triangular faces until a hexagonal shape is attained. Although the thermodynamic driving force is the minimization of the fraction of undercoordinated surface atoms, with the final structure being an isotropic sphere, both surface curvature and surface faceting play a role in determining the pathway to be taken. The peculiar morphology of triangular nanoplates allowed the transition to hexagonal nanoplates to occur with the structure remaining enclosed by stable {111} facets on all faces. Our results demonstrate how in situ electron microscopy can afford fundamental insights into the reshaping mechanisms of anisotropic nanocrystals
URI
https://pr.ibs.re.kr/handle/8788114/8996
DOI
10.1021/acs.jpcc.0c04281
ISSN
1932-7447
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
Files in This Item:
There are no files associated with this item.

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse