eprintid: 2920
rev_number: 10
eprint_status: archive
userid: 284
dir: disk0/00/00/29/20
datestamp: 2018-02-06 06:47:21
lastmod: 2018-02-06 06:47:21
status_changed: 2018-02-06 06:47:21
type: article
metadata_visibility: show
creators_name: Nguyễn, Cường / Kiên
creators_id: cuongnk@vnu.edu.vn
corp_creators: Faculty of Engineering Physics and Nanotechnology, University of Engineering and Technology, Vietnam National University in Hanoi, 144 Xuan Thuy Street, Cau Giay District, Hanoi, Vietnam
title: Quantitative analysis of COOH-terminated alkanethiol SAMs on gold nanoparticle surfaces
ispublished: pub
subjects: Phys
subjects: isi
divisions: fac_physic
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
date: 2012
date_type: published
publisher: IOP Science
official_url: http://iopscience.iop.org/article/10.1088/2043-6262/3/4/045008
contact_email: cuongnk@vnu.edu.vn
full_text_status: public
publication: Advances in Natural Sciences: Nanoscience and Nanotechnology
volume: 3
number: 4
pagerange: 045008-5 pp
refereed: TRUE
issn: 2043-6262
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citation:   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     
document_url: https://eprints.uet.vnu.edu.vn/eprints/id/eprint/2920/1/Quantitative%20analysis%20of%20COOH-terminated%20alkanethiol%20SAMs%20on%20gold%20nanoparticle%20surfaces.pdf