Data/hora: 11/06/2024 01:53:57

Provedor de dados: 	5	
País: 	France	
Título: 	Evidence of the Grafting Mechanisms of Diazonium Salts on Gold Nanostructures	
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.	
Data: 	2016-08	
Ano: 	2016	
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.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00350/46139/46200.pdf

DOI:10.1021/acs.jpcc.6b06486

http://archimer.ifremer.fr/doc/00350/46139/	
Editor: 	Amer Chemical Soc	
Formato: 	application/pdf	
Fonte: 	Journal Of Physical Chemistry C (1932-7447) (Amer Chemical Soc), 2016-08 , Vol. 120 , N. 32 , P. 18158-18166	
Fonte: 	2016 American Chemical Society

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