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Polystyrene coated gold nanoparticles developed for use as an optical sensors
|Elżbieta Megiel 1, Waldemar Tomaszewski 2|
1. University of Warsaw, Faculty of Chemistry, Pasteura1, Warsaw 02-093, Poland
The core-shell polymer- metal nanoparticle hybrids have a great potential for designing a new advanced materials with unique properties combining the properties of metal core and polymer shell. One of the most important size-related phenomena observed for gold nanoparticles (AuNPs) is the surface plasmon resonance (SPR). The SPR frequency strongly depends on the size and shape of nanoparticles, dielectric properties of the surrounding chemical environment and inter-nanoparticle coupling interactions.  Additionally, appropriate modified AuNPs are excellent platform for Surface Enhanced Raman Spectroscopy (SERS). Thus AuNPs are promising to potential applications in highly sensitive chemical and biological sensors. Simultaneously polymer shell in such materials improves stability and surface chemistry of core nanoparticles. There are two major approach of synthesis of core-shell polymer hybrids: “grafting-from” and “grafting-to” methods combined with controlled/living polymerization: anionic polymerization , ATRP  and RAFT polymerization .
We report a new method for the preparation of core-shell nanostructures based on the covalent attachment of polymer chains to the gold nanoparticles covered by TEMPO radicals  during nitroxide mediated polymerization of styrene. The obtained material demonstrates strong surface plasmon resonance (SPR), narrow size distribution and uniform dispersion of metal cores in polymer matrix. The obtained nanohybrids have been characterized by X-ray photoelectron spectroscopy (XPS), thermogravimetric and elemental analyses, UV-ViS, FTIR spectroscopy and TEM observation. SEC analyses showed that the polymer shell in the obtained structures is built from polymer chains with narrow molecular weight distribution (PDI<1.2).
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Presentation: Poster at Nano and Advanced Materials Workshop and Fair, by Elżbieta Megiel
See On-line Journal of Nano and Advanced Materials Workshop and Fair
Submitted: 2013-06-27 15:51 Revised: 2013-06-28 15:37