TY  - JOUR
ID  - SisLab2920
UR  - http://iopscience.iop.org/article/10.1088/2043-6262/3/4/045008
IS  - 4
A1  - Nguy?n, C??ng / Kiên
Y1  - 2012///
N2  - 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
PB  - IOP Science
JF  - Advances in Natural Sciences: Nanoscience and Nanotechnology
VL  - 3
SN  - 2043-6262
TI  - Quantitative analysis of COOH-terminated alkanethiol SAMs on gold nanoparticle surfaces
SP  - 045008
AV  - public
EP  - 5 pp
ER  -