期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 28, 页码 16239-16244出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b03955
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资金
- Army Research Laboratory [W911NF-14-2-0116]
- National Science Foundation [CBET-1233795]
- NSF [1102689, EPS 1003907]
- Directorate For Engineering [1233795] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [1233795] Funding Source: National Science Foundation
Plasmonic metals can excite charge carriers in semiconductors through plasmon-induced resonance energy transfer (PIRET) and hot electron injection processes. Transient absorption spectroscopy reveals that the presence of plasmon-induced charge separation mechanisms in metal@TiO2 core-shell nanoparticles can be controlled by tailoring the spectral overlap and the physical contact between the metal and the semiconductor. In Ag@SiO2@TiO2 sandwich nanoparticles, the localized surface plasmon resonance band is overlapped with the absorption band edge of TiO2, enabling PIRET, while the SiO2 barrier prevents hot electron transfer. In Au@TiO2, hot electron injection occurs, but the lack of spectral overlap disables PIRET. In Ag@TiO2, both hot electron transfer and PIRET take place. In Au@SiO2@TiO2, photoconversion in TiO2 is not enhanced by the plasmon despite strong light absorption by Au.
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