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Fabrication and Characterization of Spectroscopically Encoded Core-shell Nanoparticle-polymer Nanocomposite

Published online by Cambridge University Press:  01 February 2011

Sheng Dai ,
Abdiaziz A. Farah ,
Ramon A Alvarez-Puebla ,
Juan P Bravo-Vasquez  and
Hicham Fenniri
Sheng Dai
Affiliation:
albertshengdai@yahoo.com, National Institute for Nanotechnology, National Research Council Canada, 11421 Saskatchewan Drive, Edmonton, T6G 2M9, Canada
Abdiaziz A. Farah
Affiliation:
afarah@ualberta.ca, National Institute for Nanotechnology, 11421 Saskatchewan Drive, Edmonton, T6G 2M9, Canada
Ramon A Alvarez-Puebla
Affiliation:
Ramon.Alvarez-Puebla@nrc-cnrc.gc.ca, National Institute for Nanotechnology, 11421 Saskatchewan Drive, Edmonton, T6G 2M9, Canada
Juan P Bravo-Vasquez
Affiliation:
juanb@ualberta.ca, National Institute for Nanotechnology, 11421 Saskatchewan Drive, Edmonton, T6G 2M9, Canada
Hicham Fenniri
Affiliation:
Hicham.Fenniri@nrc-cnrc.gc.ca, National Institute for Nanotechnology, 11421 Saskatchewan Drive, Edmonton, T6G 2M9, Canada
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Abstract

Metal nanoparticles are of great importance in the fabrication of new nanocomposite materials. One area of increasing interest is the application of metal nanoparticles (NP) as substrates for surface enhanced Raman scattering (SERS). In this regard, self-assembled monolayers (SAMs) of sulfur containing organic compounds are ideal target for SERS studies due to the strong affinity of sulfur for noble metals. Two types of molecules were synthesized for this study, an organic-soluble and a water-soluble styrene derivative. Self-assembling behaviors of these monomers on gold or silver nanostructured surfaces at room temperature were studied by UV-Vis spectroscopy, dynamic light scattering (DLS), SERS spectroscopy, and scanning electron microscopy (SEM). It was found that the interaction between sulfur compounds and metal NPs is strongly dependent on the NP size and the monomer environment. The hydrophilic NP surface switches to hydrophobic upon binding of sulfur-containing monomers, which leads to the formation of aggregates in aqueous solution for both water-soluble and oil-soluble monomers. The self-assembling behavior of these monomers on the metallic surface was compared with that of the corresponding homopolymers. Due to macromolecular and steric effects, the binding interaction between homopolymer and metal NP is weaker than that between NP and monomers. Surface polymerization of these monomers on metallic surfaces was observed as supported by SERS. Core-shell nanoparticles could also be obtained through seeded emulsion polymerization, but a decrease in SERS activity was observed.

Keywords

self-assemblyRaman spectroscopynanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1054: Symposium FF – Synthesis and Surface Engineering of Three-Dimensional Nanostructures , 2007 , 1054-FF12-14
Copyright
Copyright © Materials Research Society 2008

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