Hot Electron-Driven Photocatalysis Using Sub-5 nm Gap Plasmonic Nanofinger Arrays
Abstract
Semiconductor photocatalysis has received increasing attention because of its potential to address problems related to the energy crisis and environmental issues. However, conventional semiconductor photocatalysts, such as TiO2 and ZnO, can only be activated by ultraviolet light due to their wide band gap. To extend the light absorption into the visible range, the localized surface plasmon resonance (LSPR) effect of noble metal nanoparticles (NPs) has been widely used. Noble metal NPs can couple incident visible light energy to strong LSPR, and the nonradiative decay of LSPR generates nonthermal hot carriers that can be injected into adjacent semiconductor material to enhance its photocatalytic activity. Here we demonstrate that nanoimprint-defined gap plasmonic nanofinger arrays can function as visible light-driven plasmonic photocatalysts. The sub-5 nm gaps between pairs of collapsed nanofingers can support ultra-strong plasmon resonance and thus boost the population of hot carriers. The semiconductor material is exactly placed at the hot spots, providing an efficient pathway for hot carrier injection from plasmonic metal to catalytic materials. This nanostructure thus exhibits high plasmon-enhanced photocatalytic activity under visible light. The hot carrier injection mechanism of this platform was systematically investigated. The plasmonic enhancement factor was calculated using the finite-difference time-domain (FDTD) method andmore »
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1894522
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Published Article
- Journal Name:
- Nanomaterials
- Additional Journal Information:
- Journal Name: Nanomaterials Journal Volume: 12 Journal Issue: 21; Journal ID: ISSN 2079-4991
- Publisher:
- MDPI AG
- Country of Publication:
- Switzerland
- Language:
- English
Citation Formats
Wang, Yunxiang, Chen, Buyun, Meng, Deming, Song, Boxiang, Liu, Zerui, Hu, Pan, Yang, Hao, Ou, Tse-Hsien, Liu, Fanxin, Pi, Halton, Pi, Irene, Pi, Isleen, and Wu, Wei. Hot Electron-Driven Photocatalysis Using Sub-5 nm Gap Plasmonic Nanofinger Arrays. Switzerland: N. p., 2022.
Web. doi:10.3390/nano12213730.
Wang, Yunxiang, Chen, Buyun, Meng, Deming, Song, Boxiang, Liu, Zerui, Hu, Pan, Yang, Hao, Ou, Tse-Hsien, Liu, Fanxin, Pi, Halton, Pi, Irene, Pi, Isleen, & Wu, Wei. Hot Electron-Driven Photocatalysis Using Sub-5 nm Gap Plasmonic Nanofinger Arrays. Switzerland. https://doi.org/10.3390/nano12213730
Wang, Yunxiang, Chen, Buyun, Meng, Deming, Song, Boxiang, Liu, Zerui, Hu, Pan, Yang, Hao, Ou, Tse-Hsien, Liu, Fanxin, Pi, Halton, Pi, Irene, Pi, Isleen, and Wu, Wei. Mon .
"Hot Electron-Driven Photocatalysis Using Sub-5 nm Gap Plasmonic Nanofinger Arrays". Switzerland. https://doi.org/10.3390/nano12213730.
@article{osti_1894522,
title = {Hot Electron-Driven Photocatalysis Using Sub-5 nm Gap Plasmonic Nanofinger Arrays},
author = {Wang, Yunxiang and Chen, Buyun and Meng, Deming and Song, Boxiang and Liu, Zerui and Hu, Pan and Yang, Hao and Ou, Tse-Hsien and Liu, Fanxin and Pi, Halton and Pi, Irene and Pi, Isleen and Wu, Wei},
abstractNote = {Semiconductor photocatalysis has received increasing attention because of its potential to address problems related to the energy crisis and environmental issues. However, conventional semiconductor photocatalysts, such as TiO2 and ZnO, can only be activated by ultraviolet light due to their wide band gap. To extend the light absorption into the visible range, the localized surface plasmon resonance (LSPR) effect of noble metal nanoparticles (NPs) has been widely used. Noble metal NPs can couple incident visible light energy to strong LSPR, and the nonradiative decay of LSPR generates nonthermal hot carriers that can be injected into adjacent semiconductor material to enhance its photocatalytic activity. Here we demonstrate that nanoimprint-defined gap plasmonic nanofinger arrays can function as visible light-driven plasmonic photocatalysts. The sub-5 nm gaps between pairs of collapsed nanofingers can support ultra-strong plasmon resonance and thus boost the population of hot carriers. The semiconductor material is exactly placed at the hot spots, providing an efficient pathway for hot carrier injection from plasmonic metal to catalytic materials. This nanostructure thus exhibits high plasmon-enhanced photocatalytic activity under visible light. The hot carrier injection mechanism of this platform was systematically investigated. The plasmonic enhancement factor was calculated using the finite-difference time-domain (FDTD) method and was consistent with the measured improvement of the photocatalytic activity. This platform, benefiting from the precise controllable geometry, provides a deeper understanding of the mechanism of plasmonic photocatalysis.},
doi = {10.3390/nano12213730},
journal = {Nanomaterials},
number = 21,
volume = 12,
place = {Switzerland},
year = {Mon Oct 24 00:00:00 EDT 2022},
month = {Mon Oct 24 00:00:00 EDT 2022}
}
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