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Title: Synthesis of hexagonal close-packed gold nanostructures
Authors: Huang, Xiao
Li, Shaozhou
Huang, Yizhong
Wu, Shixin
Zhou, Xiaozhu
Li, Shuzhou
Gan, Chee Lip
Boey, Freddy Yin Chiang
Mirkin, Chad A.
Zhang, Hua
Keywords: DRNTU::Engineering::Materials::Nanostructured materials
Issue Date: 2011
Source: Huang, X., Li, S., Huang, Y., Wu, S., Zhou, X., Li, S., et al. (2011). Synthesis of hexagonal close-packed gold nanostructures. Nature Communications, 2(292).
Series/Report no.: Nature communications
Abstract: Solid gold is usually most stable as a face-centred cubic (fcc) structure. To date, no one has synthesized a colloidal form of Au that is exclusively hexagonal close-packed (hcp) and stable under ambient conditions. Here we report the first in situ synthesis of dispersible hcp Au square sheets on graphene oxide sheets, which exhibit an edge length of 200–500 nm and a thickness of ~ 2.4 nm (~ 16 Au atomic layers). Interestingly, the Au square sheet transforms from hcp to a fcc structure on exposure to an electron beam during transmission electron microscopy analysis. In addition, as the square sheet grows thicker (from ~ 2.4 to 6 nm), fcc segments begin to appear. A detailed experimental analysis of these structures shows that for structures with ultrasmall dimensions (for example, <~ 6 nm thickness for the square sheets), the previously unobserved pure hcp structure becomes stable and isolable.
ISSN: 2041-1723
DOI: 10.1038/ncomms1291
Rights: © 2011 Macmillan Publishers Limited.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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