Assembly of gold nanoparticles on a molecular ultrathin film: tuning the surface plasmon resonance

Rajesh, K. ; Sreedhar, B. ; Radhakrishnan, T. P. (2010) Assembly of gold nanoparticles on a molecular ultrathin film: tuning the surface plasmon resonance ChemPhysChem, 11 (8). pp. 1780-1786. ISSN 1439-4235

Full text not available from this repository.

Official URL: http://onlinelibrary.wiley.com/doi/10.1002/cphc.20...

Related URL: http://dx.doi.org/10.1002/cphc.200900675

Abstract

A number of methodologies for immobilizing metal nanoparticles in 2-dimensional aggregate structures on various substrates, some with concomitant tuning of the surface plasmon resonance (SPR), have been reported. Many of them involve special functionalization of the nanoparticles, multiple fabrication steps or lengthy procedures. The present study demonstrates that monolayer Langmuir-Blodgett (LB) film of a hemicyanine-based amphiphile with cationic headgroup is an easily fabricated platform for harnessing citrate-stabilized gold nanoparticles. It is shown that a single immersion step can be used to immobilize the nanoparticles uniformly on large area films and that systematic variation of the immersion time from 10 min to 6 h leads to controlled assembly of the particles and tuning of the SPR band over ~100 nm. A model for the structural reorganization in the LB film that facilitates the assembly of nanoparticles is presented and the advantages of the current methodology over earlier protocols are pointed out. The versatility of LB films in terms of the molecular level control of fabrication it enables and the variety of film structures that can be realized, point to the wide scope for future explorations, expanding upon the present observations.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:2-dimensional Aggregates; Gold Nanoparticles; Hemicyanine Amphiphile; Langmuir-Blodgett Film; Surface Plasmon Resonance
ID Code:65932
Deposited On:19 Oct 2011 14:26
Last Modified:19 Oct 2011 14:26

Repository Staff Only: item control page