Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Reversible assembly of metal nanoparticles induced by penicillamine. Dynamic formation of SERS hot spots

Taladriz Blanco, Patricia, Buurma, Niklaas Jan, Rodriguez Lorenzo, Laura, Perez Juste, Jorge, Liz Marzan, Luis and Herves, Pablo 2011. Reversible assembly of metal nanoparticles induced by penicillamine. Dynamic formation of SERS hot spots. Journal of Materials Chemistry 21 (42) , pp. 16880-16887. 10.1039/C1JM12175H

[img]
Preview
PDF
Download (757kB) | Preview

Abstract

We report a systematic study of the surface modification of gold and silver nanoparticles with dl-penicillamine (PEN) and N-acetyl-dl-penicillamine (NAP), motivated by the possibility of inducing pH-controlled reversible nanoparticle assembly. The interaction of PEN and NAP with the metal nanoparticle surface was studied by isothermal titration calorimetry (ITC). The results indicate that equilibrium is reached with the formation of a submonolayer corresponding to ca. 40% and 64% of total surface coverage for PEN and NAP, respectively. Both PEN and NAP modified nanoparticles could be reversibly aggregated at acidic pH due to the protonation of the carboxylic groups, leading to a decrease in their stability by electrostatic interactions and the advent of hydrogen bonding interactions which promote interparticle linkage. The process was monitored by UV-Vis spectroscopy, transmission electron microscopy (TEM) and surface enhanced Raman scattering (SERS) spectroscopy. Interestingly, the SERS characterization demonstrated the pH-controlled formation of hot-spots.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: RSC Publishing
ISSN: 0959-9428
Funders: EPSRC EP/D001641/1
Last Modified: 04 Jun 2017 02:54
URI: http://orca-mwe.cf.ac.uk/id/eprint/13502

Citation Data

Cited 33 times in Google Scholar. View in Google Scholar

Cited 59 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics