One-Pot Room-Temperature Synthesis of Single-Crystalline Gold Nanocorolla in Water.
A room-temperature nanocarving strategy is developed for the fabrication of complex gold nanoplates having corolla- and propeller-like architectures. It is based on the simultaneous growth and etching of gold nanoplates in aqueous solution, which occur in the course of photoreduction of Au(OH) ions....
| Publicado en: | Journal of the American Chemical Society Vol. 131; no. 40; pp. 14407 - 14413 |
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| Autores principales: | , |
| Formato: | Artículo |
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American Chemical Society
10/14/2009
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=44750081&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 44750081 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 10/14/2009 vid: 131 iid: 40 pid: 997 pub: American Chemical Society artinfo: ui: 44750081 10.1021/ja904910m ppf: 14407 ppct: 6 formats: tig: atl: One-Pot Room-Temperature Synthesis of Single-Crystalline Gold Nanocorolla in Water. aug: au: Soejima, Tetsuro Kimizuka, Nobuo affil: Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University and JST, CREST, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan su: Gold Nanocrystals Crystal growth Bromide ions Povidone Diffraction patterns Nucleation Particles (Nuclear physics) sug: subj: Gold Nanocrystals Crystal growth Bromide ions Povidone Diffraction patterns Nucleation Particles (Nuclear physics) ab: A room-temperature nanocarving strategy is developed for the fabrication of complex gold nanoplates having corolla- and propeller-like architectures. It is based on the simultaneous growth and etching of gold nanoplates in aqueous solution, which occur in the course of photoreduction of Au(OH) ions. The presence of bromide ion, poly(vinylpyrrolidone) (PVP), and molecular oxygen is indispensable, where bromide ions play multiple roles. First, they promote formation of nanoplate structures by forming adlayers on the fcc(111) surface. Second, they facilitate oxidative dissolution of gold nanocrystals by converting the oxidized Au(I) species to soluble AuBr ions, which lead to the formation of ultrathin nanocrevasses. PVP also stabilizes the nucleation of gold nanoplates. Although the overall reactions proceed in one-pot, the crystal growth and etching show interplay and occur with different kinetics due to changes in the concentration of Au(OH) and other species with time. Corolla- or propeller-like gold nanoplates formed under these conditions are single-crystalline, as indicated by selected area electron diffraction patterns and the observation of moire fringes. The morphology of corolla- or propeller-like gold nanoplates is controllable depending on the concentration of bromide ion and PVP in the aqueous mixture. On the basis of these results, a preliminary mechanism is proposed which involves the concurrent crystal growth and oxidative etching on the surface of nanocrystals. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2009 holdings: @attributes: islocal: N |
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