XPS and FTIR analysis of glycine adsorption onto undoped and flourine doped Diamond like carbon films

Ahmed, M, Anthony Byrne, J, Ahmed, Waqar and Jackson, M (2012) XPS and FTIR analysis of glycine adsorption onto undoped and flourine doped Diamond like carbon films. Journal of Manufacturing Technology Research, 4 (3-4). pp. 105-123. ISSN 1943-8095

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Abstract

The adsorption of glycine onto Diamond like carbon (DLC) and fluorine doped DLC thin films synthesised by Plasma Enhanced Chemical Vapour Deposition (PECVD) has been investigated with a range of surface analysis techniques. The effects of surface morphology on the interaction of simplest amino acid (glycine) with modified hydrogenated amorphous carbon films have been investigated. The chemical composition of the surface before and after adsorption was analysed using X-ray photoelectron spectroscopy (XPS). For undoped DLC the spectra show peaks at 285 eV (C1s), 532 eV (O1s) and in the case of F-doped DLC samples a band at 684 eV (F1s) is observed. Following exposure to solutions containing (0.01M) glycine, for undoped DLC the peaks at ~285.0, ~399 and ~532 eV reduced in intensity and for F-doped DLC the peak at 684 eV was reduced. This gives an indication of the quantitative change in the amounts of C, N and O on the surfaces. A Fourier transform infrared (FTIR) spectrum was also recorded for the same films at room temperature. From the wave number where the peaks occur the following functional groups were assigned as COO-R, COO-, -NH3 +, NH2, C-H and C-C-N. Both XPS and FTIR spectroscopy confirm that glycine was bound onto the surfaces of the DLC and F-DLC films via interaction of ionized carboxyl groups and the amino group did not play a significant role in the adsorption of glycine. This is as expected with fluorine being a highly electronegative element and thus having a high affinity for negative component of glycine. © 2012 Nova Science Publishers, Inc.

Additional Information:cited By 0 © Copyright 2013 Elsevier B.V., All rights reserved.
Keywords:diamond like carbon, DLC, doping, F-DLC, FTIR spectroscopy, glycine amino acid, XPS
Subjects:F Physical Sciences > F200 Materials Science
J Technologies > J510 Materials Technology
Divisions:College of Science > School of Mathematics and Physics
ID Code:27158
Deposited On:28 Aug 2018 15:27

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