| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Evidence of the Grafting Mechanisms of Diazonium Salts on Gold Nanostructures
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| Autores: |
Betelu, Stephanie
Tijunelyte, Inga
Boubekeur-lecaque, Leila
Ignatiadis, Ioannis
Ibrahim, Joyce
Gaboreau, Stephane
Berho, Catherine
Toury, Timothee
Guenin, Erwann
Lidgi-guigui, Nathalie
Felidj, Nordin
Rinnert, Emmanuel
Lamy De La Chapelle, Marc
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| Data: |
2016-08
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| Ano: |
2016
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| Resumo: |
Gold nanostructures (GNS) were chemically functionalized using four different diazonium salts: benzene-diazonium-tetrafluoroborate (DS), 4-decylbenzene-diazonium-tetrafluoroborate (DS-C10H21), 4-carboxybenzene-diazonium-tetrafluoroborate (DS-COOH), and 4-(aminoethyl)-benzene-diazonium-tetrafluoroborate (DS-(CH2)(2)NH2). Effective chemical grafting on GNS was shown by surface-enhanced Raman spectroscopy (SERS); aromatic ring deformations in the range of 1570-1591 cm(-1) are of particular interest. The very strong band observed around 1075 cm(-1), related to CH in-plane bending for mono- and para-substituted benzenes (coupled with ring-N stretching mode), provided further irrefutable evidence of the grafting. SERS enhancement of these two bands ascertains the perpendicular orientation of the aromatic rings on the GNS. X-ray photoelectron spectroscopy (XPS) analyses of chemically grafted flat gold surfaces suggest azophenyl radical pathways when using DS, DS-(CH2)(2)-NH2, or DS-C10H21. It was shown that coating at the interface is the result of a Au-N covalent bond; growth of the layers is via N=N. These XPS results agree with those provided by SERS without excluding the aryl radical pathways. For DS-COOH, the results provided by SERS, XPS, and density functional theory calculations show (i) effective chemical grafting of the GNS via a covalent bond between gold and carboxylate forms and (ii) growth via multilayers in the meta position between aromatic rings through either N=N or C-C bonds.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00350/46139/46200.pdf
DOI:10.1021/acs.jpcc.6b06486
http://archimer.ifremer.fr/doc/00350/46139/
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| Editor: |
Amer Chemical Soc
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| Formato: |
application/pdf
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| Fonte: |
Journal Of Physical Chemistry C (1932-7447) (Amer Chemical Soc), 2016-08 , Vol. 120 , N. 32 , P. 18158-18166
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| Direitos: |
2016 American Chemical Society
info:eu-repo/semantics/openAccess
restricted use
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