Observation of Charge Separation Enhancement in Plasmonic Photocatalysts under Coupling Conditions.
Yuying GaoQianhong ZhuShan HeShengyang WangWei NieKaifeng WuFengtao FanCan LiPublished in: Nano letters (2023)
Surface plasmon resonance-induced charge separation plays key roles in plasmon-related applications, especially in photocatalysis and photovoltaics. Plasmon coupling nanostructures exhibit extraordinary behaviors in hybrid states, phonon scattering, and ultrafast plasmon dephasing, but plasmon-induced charge separation in these materials remains unknown. Here, we design Schottky-free Au nanoparticle (NP)/NiO/Au nanoparticles-on-a-mirror plasmonic photocatalysts to support plasmon-induced interfacial hole transfer, evidenced by surface photovoltage microscopy at the single-particle level. In particular, we observe a nonlinear increase in charge density and photocatalytic performance with an increase in excitation intensity in plasmonic photocatalysts containing hot spots as a result of varying the geometry. Such charge separation increased the internal quantum efficiency by 14 times at 600 nm in catalytic reactions as compared to that of the Au NP/NiO without a coupling effect. These observations provide an improved understanding of charge transfer management and utilization by geometric engineering and interface electronic structure for plasmonic photocatalysis.
Keyphrases
- visible light
- energy transfer
- high glucose
- solar cells
- single molecule
- diabetic rats
- sensitive detection
- liquid chromatography
- electron transfer
- drug induced
- reduced graphene oxide
- label free
- endothelial cells
- photodynamic therapy
- room temperature
- high resolution
- ionic liquid
- oxidative stress
- molecular dynamics simulations
- high speed