Authors
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Gupta, S. ; Agrawal, M. ; Uhlmann, P. ; Oertel, U. ; Stamm, M.
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Title
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Gold nanoparticles immobilized on stimuli responsive polymer brushes as nanosensors
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Date
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19.12.2008
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Number
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18582
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Abstract
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We report on the immobilization of gold nanoparticles on end-functionalized and solvent responsive polystyrene brushes, grafted on an underlying substrate. The presence of gold nanoparticles on polystyrene brushes was confirmed by atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The resulting polystyrene-Au nanoassemblies have been used as the nanosensors for the detection of a variety of organic solvents in surrounding media. The sensing mechanism is based upon the change in the proximity of the immobilized gold nanoparticles as a consequence of the solvent induced reversible swelling-deswelling of polystyrene chains. The sensing ability was demonstrated by a simple analytic tool, i.e., UV-vis spectroscopy, through a shift in plasmon resonance band of immobilized Au nanoparticles. A dramatic blue shift of 32 nm in the surface resonance band was observed as the surrounding media of Au immobilized polystyrene brushes (Au-PS) was changed from air to the toluene. The described approach is facile and versatile in nature, which can be used for the fabrication of a variety of nanosensors based on the polymer brushes-nanoparticle assemblies.
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Publisher
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Macromolecules
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Wikidata
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Citation
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Macromolecules 41 (2008) 8152-8158
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DOI
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https://doi.org/10.1021/ma801557u
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Tags
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surface-plasmon resonance enhanced raman-scattering self-assembled monolayers colloid monolayers preferential solvation langmuir-blodgett collapse layers chains polynucleotides
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