Direct observation of Pt nanocrystal coalescence induced by electron-excitation-enhanced van der Waals interactions

Jiang, Ying, Wang, Yong, Zhang, Yu Yang, Zhang, Zhengfei, Yuan, Wentao, Sun, Chenghua, Wei, Xiao, Brodsky, Casey N., Tsung, Chia-Kuang, Li, Jixue, Zhang, Xiaofeng, Mao, Scott X., Zhang, Shengbai and Zhang, Ze (2014) Direct observation of Pt nanocrystal coalescence induced by electron-excitation-enhanced van der Waals interactions. Nano Research, 7 3: 308-314. doi:10.1007/s12274-013-0396-5


Author Jiang, Ying
Wang, Yong
Zhang, Yu Yang
Zhang, Zhengfei
Yuan, Wentao
Sun, Chenghua
Wei, Xiao
Brodsky, Casey N.
Tsung, Chia-Kuang
Li, Jixue
Zhang, Xiaofeng
Mao, Scott X.
Zhang, Shengbai
Zhang, Ze
Title Direct observation of Pt nanocrystal coalescence induced by electron-excitation-enhanced van der Waals interactions
Journal name Nano Research   Check publisher's open access policy
ISSN 1998-0000
1998-0124
Publication date 2014-03-01
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s12274-013-0396-5
Volume 7
Issue 3
Start page 308
End page 314
Total pages 7
Place of publication Beijing, China
Publisher Tsinghua University Press
Language eng
Formatted abstract
Nanocrystal coalescence has attracted paramount attention in nanostructure fabrication in the past decades. Tremendous endeavor and progress have been made in understanding its mechanisms, benefiting from the development of transmission electron microscopy. However, many mechanisms still remain unclear, especially for nanocrystals that lack a permanent dipole moment standing on a solid substrate. Here, we report an in situ coalescence of Pt nanocrystals on an amorphous carbon substrate induced by electron-excitationenhanced van der Waals interactions studied by transmission electron microscopy and first principles calculations. It is found that the electron-beam-induced excitation can significantly enhance the van der Waals interaction between Pt nanocrystals and reduce the binding energy between Pt nanocrystals and the carbon substrate, both of which promote the coalescence. This work extends our understanding of the nanocrystal coalescence observed in a transmission electron microscope and sheds light on a potential pathway toward practical electronbeam-controlled nanofabrication.
Keyword Pt nanocrystals
Coalescence
Electron excitation
van der Waals interactions
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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