Abstract
We firstly, in this review, introduce the optical properties of plasmonic metals, and then focus on introducing the unique optical properties of the noble metal–metal-oxide hybrid system by revealing the physical mechanism of plasmon–exciton interaction, which was confirmed by theoretical calculations and experimental investigations. With this noble metal–metal-oxide hybrid system, plasmonic nanostructure–semiconductor exciton coupling interactions for interface catalysis has been analyzed in detail. This review can provide a deeper understanding of the physical mechanism of exciton–plasmon interactions in surface catalysis reactions.
Highlights
Surface plasmons (SPs) are coherent collective electrons oscillating along the interface where the signs of the real part of the dielectric function are different in the two sides [1]
By comparing the lifetimes of the two excitonic states of MoS2 (Figure 4), we find that the plasmon–exciton coupling interaction has a strong impact on the lifetime of excitonic states
Since 2010, plasmonic hot electrons have been found to be critical in catalysis monitored by the surface-enhanced Raman scattering (SERS) and tip-enhanced Raman scattering (TERS) [12,106,107]
Summary
Surface plasmons (SPs) are coherent collective electrons oscillating along the interface where the signs of the real part of the dielectric function are different in the two sides [1]. With a properly designed nanostructure that is usually efficient in light-trapping [19,20], localized surface plasmon resonance (LSPR) can occur where the confined free electrons oscillate with the same frequency as the incident radiation and lead to a highly and intense localized electromagnetic field. Based on this phenomenon, SERS has been broadly studied, where the Raman signals can be enhanced over a large frequency range.
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