Light-Directed Tuning of Plasmon Resonances via Plasmon-Induced Polymerization Using Hot Electrons
journal contributionposted on 25.04.2017, 00:00 by Tao Ding, Jan Mertens, Anna Lombardi, Oren A. Scherman, Jeremy J. Baumberg
The 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.
Read the peer-reviewed publication
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