| Autor: |
DuChene, Joseph S., Williams, Benjamin P., Johnston‐Peck, Aaron C., Qiu, Jingjing, Gomes, Mathieu, Amilhau, Maxime, Bejleri, Donald, Weng, Jiena, Su, Dong, Huo, Fengwei, Stach, Eric A., Wei, Wei David |
| Předmět: |
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| Zdroj: |
Advanced Energy Materials; 1/7/2016, Vol. 6 Issue 1, pn/a-N.PAG, 10p |
| Abstrakt: |
Despite many promising reports of plasmon-enhanced photocatalysis, the inability to identify the individual contributions from multiple enhancement mechanisms has delayed the development of general design rules for engineering efficient plasmonic photocatalysts. Herein, a plasmonic photocathode comprised of Au@SiO2 (core@shell) nanoparticles embedded within a Cu2O nanowire network is constructed to exclusively examine the contribution from one such mechanism: electromagnetic near-field enhancement. The influence of the local electromagnetic field intensity is correlated with the overall light-harvesting efficiency of the device through variation of the SiO2 shell thickness (5-22 nm) to systematically tailor the distance between the plasmonic Au nanoparticles and the Cu2O nanowires. A threefold increase in device photocurrent is achieved upon integrating the Au@SiO2 nanoparticles into the Cu2O nanowire network, further enabling a 40% reduction in semiconductor film thickness while maintaining photocathode performance. Photoelectrochemical results are further correlated with photoluminescence studies and optical simulations to confirm that the near-field enhancement is the sole mechanism responsible for increased light absorption in the plasmonic photocathode. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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