Synthesis of hexagonal close-packed gold nanostructures

Xiao Huang, Shaozhou Li, Yizhong Huang, Shixin Wu, Xiaozhu Zhou, Shuzhou Li, Chee Lip Gan, Freddy Boey, Chad A. Mirkin () and Hua Zhang ()
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Xiao Huang: School of Materials Science and Engineering, Nanyang Technological University
Shaozhou Li: School of Materials Science and Engineering, Nanyang Technological University
Yizhong Huang: School of Materials Science and Engineering, Nanyang Technological University
Shixin Wu: School of Materials Science and Engineering, Nanyang Technological University
Xiaozhu Zhou: School of Materials Science and Engineering, Nanyang Technological University
Shuzhou Li: School of Materials Science and Engineering, Nanyang Technological University
Chee Lip Gan: School of Materials Science and Engineering, Nanyang Technological University
Freddy Boey: School of Materials Science and Engineering, Nanyang Technological University
Chad A. Mirkin: Northwestern University
Hua Zhang: School of Materials Science and Engineering, Nanyang Technological University

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: 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,

Date: 2011
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DOI: 10.1038/ncomms1291

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