Abstract
A surface plasmon in a metal nanoparticle is the coherent oscillation of the conduction band electrons leading to both absorption and scattering as well as strong local electromagnetic fields. These fundamental properties have been exploited in many different ways, including for example surface enhanced spectroscopy and sensing, photothermal cancer therapy, and color display generation. Plasmons are both sensitive antennas to amplify and record spectroscopic signals but also convert the incident photon energy into excited charge carriers. The latter can be exploited for chemical redox reactions at the nanoparticle surface. To eliminate heterogeneities caused by nanoparticle size and shape, we have developed an electrochemical approach to monitor the plasmon resonance of individual nanoparticles while applying electrochemical potentials to charge the particles, change the surrounding electrolyte double layer, and assist in redox reaction as the metal nanoelectrode Fermi level is tuned. In this talk I will present our recent progress especially with respect to understanding how plasmons can be utilized beyond sensing in electrochemical redox reactions.
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