en
Scientific article
English

Adsorption of Gold and Silver Nanoparticles on Polyelectrolyte Layers and Growth of Polyelectrolyte Multilayers: An In Situ ATR-IR Study

Published inJournal of physical chemistry. C, vol. 117, no. 50, p. 26652-26658
Publication date2013
Abstract

Attenuated total reflection infrared (ATR-IR) spectroscopy is used to study the adsorption of gold and silver nanoparticles and the layer-by-layer (LBL) growth of polyelectrolyte multilayers on a Ge ATR crystal. The Ge ATR crystal is first functionalized using positively charged polyelectrolyte poly(allylamine hydrochloride) (PAH). Then citrate-stabilized gold or silver nanoparticles are adsorbed onto the modified Ge ATR crystal. When gold or silver nanoparticles are adsorbed, a drastic increase of the water signal is observed which is attributed to an enhanced absorption of IR radiation near the nanoparticles. This enhancement was much larger for the silver nanoparticles (SNP). On top of the nanoparticles multilayers of oppositely charged polyelectrolytes PAH and poly(sodium 4-styrenesulfonate) (PSS) were deposited, which allowed to study the enhancement of the IR signals as a function of the distance from the nanoparticles. Furthermore, adsorption of a thiol, N-acetyl-l-cysteine, on the nanoparticles confirmed the enhancement. In the case of SNP an absorbance signal of about 15% was observed, which is a factor of about 40 times larger compared to typical signals measure without nanoparticles.

Research group
Citation (ISO format)
GHOSH, Harekrishna, BUERGI, Thomas. Adsorption of Gold and Silver Nanoparticles on Polyelectrolyte Layers and Growth of Polyelectrolyte Multilayers: An In Situ ATR-IR Study. In: Journal of physical chemistry. C, 2013, vol. 117, n° 50, p. 26652–26658. doi: 10.1021/jp409241t
Main files (1)
Article (Published version)
accessLevelRestricted
Identifiers
ISSN of the journal1932-7447
452views
0downloads

Technical informations

Creation05/10/2017 10:19:00 AM
First validation05/10/2017 10:19:00 AM
Update time03/15/2023 1:39:49 AM
Status update03/15/2023 1:39:49 AM
Last indexation01/16/2024 11:54:47 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack