Reverse Self-Assembly: (111)-Oriented Gold Crystallization at Alkylthiol Monolayer Templates
Journal Article
·
· Phys. Rev. Lett.
- NWU
It has long been known that thiol-terminated molecules self-assemble as commensurate monolayers on Au(111) surfaces. By spreading floating octadecanethiol monolayers on aqueous solutions of chloroauric acid (HAuCl{sub 4}) and using x rays to reduce the gold ions as well as to probe the structure, we have observed the nucleation of (111)-oriented Au nanoparticles at thiol surfaces. This process may be similar to the formation of biogenic gold by bacteria. The thiol monolayer acts as a 'soft template,' changing its structure as Au crystals form so that there is a {radical}3 x {radical}3 commensurate relationship.
- Research Organization:
- Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
- Sponsoring Organization:
- NSF
- OSTI ID:
- 1025634
- Journal Information:
- Phys. Rev. Lett., Journal Name: Phys. Rev. Lett. Journal Issue: (11) ; 09, 2011 Vol. 107; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- ENGLISH
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