Synthesis of hexagonal close-packed gold nanostructures
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 gr...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/97233 http://hdl.handle.net/10220/10514 |
| _version_ | 1826114280653586432 |
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| author | Huang, Xiao Li, Shaozhou Huang, Yizhong Wu, Shixin Zhou, Xiaozhu Li, Shuzhou Gan, Chee Lip Boey, Freddy Yin Chiang Mirkin, Chad A. Zhang, Hua |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Huang, Xiao Li, Shaozhou Huang, Yizhong Wu, Shixin Zhou, Xiaozhu Li, Shuzhou Gan, Chee Lip Boey, Freddy Yin Chiang Mirkin, Chad A. Zhang, Hua |
| author_sort | Huang, Xiao |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T03:36:36Z |
| format | Journal Article |
| id | ntu-10356/97233 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:36:36Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/972332020-06-01T10:26:37Z Synthesis of hexagonal close-packed gold nanostructures Huang, Xiao Li, Shaozhou Huang, Yizhong Wu, Shixin Zhou, Xiaozhu Li, Shuzhou Gan, Chee Lip Boey, Freddy Yin Chiang Mirkin, Chad A. Zhang, Hua School of Materials Science & Engineering Centre for Biomimetic Sensor Science DRNTU::Engineering::Materials::Nanostructured materials 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. 2013-06-20T08:29:15Z 2019-12-06T19:40:26Z 2013-06-20T08:29:15Z 2019-12-06T19:40:26Z 2011 2011 Journal Article 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). 2041-1723 https://hdl.handle.net/10356/97233 http://hdl.handle.net/10220/10514 10.1038/ncomms1291 en Nature communications © 2011 Macmillan Publishers Limited. |
| spellingShingle | DRNTU::Engineering::Materials::Nanostructured materials Huang, Xiao Li, Shaozhou Huang, Yizhong Wu, Shixin Zhou, Xiaozhu Li, Shuzhou Gan, Chee Lip Boey, Freddy Yin Chiang Mirkin, Chad A. Zhang, Hua Synthesis of hexagonal close-packed gold nanostructures |
| title | Synthesis of hexagonal close-packed gold nanostructures |
| title_full | Synthesis of hexagonal close-packed gold nanostructures |
| title_fullStr | Synthesis of hexagonal close-packed gold nanostructures |
| title_full_unstemmed | Synthesis of hexagonal close-packed gold nanostructures |
| title_short | Synthesis of hexagonal close-packed gold nanostructures |
| title_sort | synthesis of hexagonal close packed gold nanostructures |
| topic | DRNTU::Engineering::Materials::Nanostructured materials |
| url | https://hdl.handle.net/10356/97233 http://hdl.handle.net/10220/10514 |
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