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Multiplasmon modes for enhancing the photocatalytic activity of Au/Ag/Cu2O core–shell nanorods
- Source :
- Nanoscale. 11:16445-16454
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- One of the critical challenges for semiconductor photocatalysis is the high efficiency utilization of solar energy. For plasmonic metal-semiconductor photocatalysts, the photocatalytic activity over an extended wavelength range for a photoresponsive semiconductor could be significantly improved either via the direct electron transfer (DET) or via the plasmon-induced resonant energy transfer (PIRET). Still, the narrow spectral overlap of plasmon and the semiconductor band edge is a key factor in restricting the development of PIRET. Herein, we have introduced a simple and versatile strategy to realize a broad spectral overlap by creating multipolar plasmon resonances near the semiconductor band edge. Cu2O coated Au/Ag nanorods (NRs) were prepared using a facile wet chemistry method. Transverse plasmon modes of Au/Ag/Cu2O NRs can split into dipole and octupole plasmon modes. The core aspect ratio and shell thickness could be used to regulate these two modes for extending the spectral overlap of plasmon resonance and the Cu2O band edge. Au/Ag/Cu2O NRs were found to display enhanced visible light photocatalytic activity compared to spherical Au/Ag/Cu2O nanoparticles. The enhancement mechanism was ascribed to both dipole and octupole plasmon modes boosting electron-hole separation in Cu2O via PIRET as confirmed by transient absorption measurements.
- Subjects :
- Materials science
business.industry
Physics::Optics
Nanoparticle
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Dipole
Semiconductor
Ultrafast laser spectroscopy
Photocatalysis
Optoelectronics
General Materials Science
Nanorod
Surface plasmon resonance
0210 nano-technology
business
Plasmon
Subjects
Details
- ISSN :
- 20403372 and 20403364
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Nanoscale
- Accession number :
- edsair.doi...........6b841cb9965eb6fbec87187825077349