Quantitative analysis of COOH-terminated alkanethiol SAMs on gold nanoparticle surfaces

Nguyễn, Cường / Kiên (2012) Quantitative analysis of COOH-terminated alkanethiol SAMs on gold nanoparticle surfaces. Advances in Natural Sciences: Nanoscience and Nanotechnology, 3 (4). 045008-5 pp. ISSN 2043-6262

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Abstract

Surface-functionalization of a self-assembled monolayer (SAM) can be achieved byintroducing functional molecules at the terminal. To immobilize biomolecules on a gold substrate, COOH-terminated alkanethiol SAMs are preferably employed. Thiol molecules adsorption on gold surface was performed using thioglycolic acid (TGA, HS-CH2-COOH) monomers and a self-assembled technique. Characterization by Fourier transform infrared (FTIR) spectroscopy revealed gold–sulfur (Au–S) bonding through confirming the presence and disappearance of thiol molecules on the Au surface before and after the sample’s immersion in the TGA solution. Moreover, FTIR spectra also proved the presence of carboxyl molecules (C=O; OH) at the free end on the gold nanoparticle (AuNP) surface. Quantitative analysis of the carboxyl molecules interacted with methylene blue (MB) ones, and then identification by UV-Vis absorption spectroscopy showed that the average density of the carboxyl molecules on the free end of the alkanethiol SAM was about 3.9 × 1014 molecules per cm2 Keywords: Au–S bond, self-assembled monolayer (SAM), thioglycolic acid (TGA), carboxyl molecular density

Item Type:	Article
Subjects:	Engineering Physics ISI-indexed journals
Divisions:	Faculty of Engineering Physics and Nanotechnology (FEPN)
Depositing User:	Assoc.Prof Cuong / Kien NGUYEN
Date Deposited:	06 Feb 2018 06:47
Last Modified:	06 Feb 2018 06:47
URI:	http://eprints.uet.vnu.edu.vn/eprints/id/eprint/2920

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