10 September 2014 Asymmetric gold nanoparticle reduction into polydimethylsiloxane thin films
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Abstract
Polymer thin films embedded with plasmonic gold nanoparticles (AuNPs) are of significant interest in biomedicine, optics, photovoltaic, and nanoelectromechanical systems. Thin polydimethylsiloxane (PDMS) films containing 3-7 micron layers of AuNPs that were fabricated with a novel diffusive-reduction synthesis technique attenuated up to 85% of incoming laser light at the plasmon resonance. Rapid diffusive reduction of AuNPs into asymmetric PDMS thin films provided superior optothermal capabilities relative to thicker films in which AuNPs were reduced throughout. A photonto- heat conversion of up to 3000°C/watt was demonstrated, which represents a 3-230-fold increase over previous AuNPfunctionalized systems. Optical attenuation and thermal response increased in proportion to order of magnitude increases in tetrachloroaurate (TCA) solution concentration. Optical and thermoplasmonic responses were observed with and without an adjacent mesh support, which increased attenuation but decreased thermal response. Morphological, optical, and thermoplasmonic properties of asymmetric AuNP-PDMS films varied significantly with diffusive TCA concentration. Gold nanoparticles, networks, and conglomerates were formed via reduction as the amount of dissolved TCA increased across a log10-scale. Increasing TCA concentrations caused polymer surface cratering, leading to a larger effective surface area. This method, utilizing the diffusion of TCA into a single exposed partially cured PDMS interface, could be used to replace expensive lithographic or solution synthesis of plasmon-functionalized systems.
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Jeremy R. Dunklin, Jeremy R. Dunklin, Gregory T. Forcherio, Gregory T. Forcherio, Keith R. Berry, Keith R. Berry, D. Keith Roper, D. Keith Roper, } "Asymmetric gold nanoparticle reduction into polydimethylsiloxane thin films ", Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 916330 (10 September 2014); doi: 10.1117/12.2061908; https://doi.org/10.1117/12.2061908
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