Abstract
Compared to the limited absorption cross-section of conventional photoactive TiO2 nanoparticles (NPs), plasmonic metallic nanoparticles can efficiently convert photons from an extended spectrum range into energetic carriers because of the localized surface plasmon resonance (LSPR). Using these metal oxide semiconductors as shells for plasmonic nanoparticles (PNPs) that absorb visible light could extend their applications. The photophysics of such systems is performed using transient absorption measurements and steady extinction simulations and shows that the plasmonic energy transfer from the AgNWs core to the TiO2 shell results from a hot carrier injection process. Lifetimes obtained from photobleaching decay dynamics suggest that (i) the presence of gold nanoparticles (AuNPs) in AgNWs@TiO2@AuNPs systems can further promote the hot carrier transfer process via plasmonic coupling effects and (ii) the carrier dynamics is greatly affected by the shell thickness of TiO2. This result points out a definite direction to design appropriate nanostructures with tunable charge transfer processes toward photo-induced energy conversion applications.
Highlights
Many authors focused on nanospheres, nanorods, nanoprisms under transient absorption spectroscopy (TAS) measurements[24,25,26], and better clarified the time scale of electron-phonon coupling and phonon-phonon coupling according to a two-temperature model[27,28], and such a technique has even been extended to novel plasmonic oxides such as indium tin oxide (ITO) nanowires[29] and indium-doped cadmium oxide (ICO) nanocrystals[30]
Wu and co-workers studied metal@Cu2O interactions such as Ag@Cu2O, Au@Cu2O and Au@SiO2@Cu2O core-shell nanostructures via TAS and showed that the photocatalytic activities were raised by simultaneously a hot electron transfer (HET) and a plasmon-induced resonant energy transfer (PIRET)[36,37,38]
Since it was well-known that the reactivity of titanium alkoxides is much higher than that of silicon alkoxides, e.g. TEOS the hydrolysis-condensation rate of the titanium precursor, i.e. TTIP (titanium (IV) tetraisopropoxide), needed to be slowed down via chemical retardants
Summary
For example, have investigated the plasmon-exciton interactions of metal and semiconductor hybrids for surface catalytic reactions[31,32,33,34] via ultrafast pump-probe TAS in the Vis-NIR region. They demonstrated the probability and the enhanced efficiency of the surface Raman scattering of these hybrids to be co-driven by graphene-AgNWs hybridization[35]. Wu and co-workers studied metal@Cu2O interactions such as Ag@Cu2O, Au@Cu2O and Au@SiO2@Cu2O core-shell nanostructures via TAS and showed that the photocatalytic activities were raised by simultaneously a hot electron transfer (HET) and a plasmon-induced resonant energy transfer (PIRET)[36,37,38].
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