Peptides adsorption on TiO<sub>2</sub> and Au: Molecular organization investigated by NEXAFS, XPS and IR期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Peptides adsorption on TiO₂ and Au: Molecular organization investigated by NEXAFS, XPS and IR

Authors:	G Iucci C Battocchio R Gambaretto F Borgatti S Monti

Institution:	^a Department of Physics, University “Roma Tre”, Via della Vasca Navale 84, 00146 Rome, Italy ^b Department of Chemical Process Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy ^c TASC-CNR, SS14, Km 163.5, 34012 Trieste, Italy ^d IPCF-CNR, Via Moruzzi 1, 56124 Pisa, Italy

Abstract:	We present a spectroscopic study of the structure of two peptides deposited on Au and TiO₂: - PeptA, (EAK16-RGD) bringing the adhesive RGD sequence linked to EAK16; - PeptB, having RGD linked to a “scrambled” sequence of the EAK16 peptide. Previously reported NEXAFS investigations on thin films of the self-assembling peptide EAK16 deposited on Au and TiO₂, revealed molecular order and orientation for both substrates.IR spectra show a β-sheet conformation for PeptA and a random structure for PeptB. Angular-dependent NEXAFS measurements reveal an ordered structure with preferential molecular orientation only for PeptA. XPS analysis indicates that PeptA is adsorbed on TiO₂ in a larger amount than PeptB.

Keywords:	XPS NEXAFS Self-assembling peptides
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