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Light-Directed Tuning of Plasmon Resonances via Plasmon-Induced Polymerization Using Hot Electrons
journal contribution
posted on 2017-04-25, 00:00 authored by Tao Ding, Jan Mertens, Anna Lombardi, Oren A. Scherman, Jeremy J. BaumbergThe precise morphology of nanoscale
gaps between noble-metal nanostructures
controls their resonant wavelengths. Here we show photocatalytic plasmon-induced
polymerization can locally enlarge the gap size and tune the plasmon
resonances. We demonstrate light-directed programmable tuning of plasmons
can be self-limiting. Selective control of polymer growth around individual
plasmonic nanoparticles is achieved, with simultaneous real-time monitoring
of the polymerization process in situ using dark-field spectroscopy.
Even without initiators present, we show light-triggered chain growth
of various monomers, implying plasmon initiation of free radicals
via hot-electron transfer to monomers at the Au surface. This concept
not only provides a programmable way to fine-tune plasmons for many
applications but also provides a window on polymer chemistry at the
sub-nanoscale.
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Selective controlPlasmon Resonancesnoble-metal nanostructures controlsshow light-triggered chain growthpolymer chemistryplasmonic nanoparticlesPlasmon-Induced PolymerizationLight-Directed Tuningshow photocatalytic plasmon-induced polymerizationgap sizepolymer growthplasmon resonancesnanoscale gapsdark-field spectroscopypolymerization processplasmon initiationhot-electron transferHot Electronsmonomer
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