1. IR-Driven strong plasmonic-coupling on Ag nanorices/W18O49 nanowires heterostructures for photo/thermal synergistic enhancement of H2 evolution from ammonia borane.
- Author
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Liu, Yang, Zhang, Zhenyi, Fang, Yurui, Liu, Benkang, Huang, Jindou, Miao, Fujun, Bao, Yanan, and Dong, Bin
- Subjects
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PLASMONICS , *HETEROSTRUCTURES , *PHOTOTHERMAL effect , *CHARGE exchange , *ELECTRIC fields , *AMMONIA , *HYDROGEN evolution reactions , *SILVER sulfide - Abstract
• IR-driven strong plasmonic coupling is achieved on a metal/non-metal heterostructure system consisting of Ag nanorices and W 18 O 49 nanowires. • Plasmonic coupling on Ag/W 18 O 49 heterostructure enhances the local electric fields with magnitudes of 101-104 times of that of incident light. • Resonance excitation not only induces ultrafast electron transfer from W 18 O 49 to Ag, but photothermal effect to increase local temperature. • Upon focused sunlight irradiation, the Ag/W 18 O 49 film shows a remarkable photo/thermal enhancement of catalytic activity for H 2 evolution. Plasmonic coupling between two or more metal nanostructures has attracted significant interest, since this fascinating near-field interaction is more effective for the aggregation/magnification of the incident light intensity compared to normal surface-plasmon-resonance (SPR) of single nanostructures. Herein, we report, for the first time, an IR-driven strong plasmonic coupling in an unusual metal/non-metal heterostructure system. This system is fabricated through random assemblage of Ag nanorices (NRs) onto W 18 O 49 nanowires (NWs) film with F-doped SnO 2 glass as substrate. Through the 3D-finite element simulation, we demonstrate that the plasmonic coupling between Ag NRs and W 18 O 49 NWs significantly enhances the localized electric fields at the "hot spots". This achieved magnitudes of 101-104 times of that of incident light, thus leading to the promoted generation of plasmonic "hot-electrons". Moreover, the resonance excitation of plasmonic coupling on the heterostructures not only induces ultrafast electron transfer from W 18 O 49 to Ag hetero-components, but also the photothermal effect to increase the localized temperature. Upon SPR-coupling excitation, the Ag/W 18 O 49 heterostructures film exhibits a remarkable enhancement of the photo/thermal catalytic activity for H 2 evolution from ammonia borane compared to that of either the Ag NRs (˜8.2 ×) or W 18 O 49 NWs (˜9.0 ×) films. Notably, we observed an obvious H 2 evolution over the Ag/W 18 O 49 heterostructures film under natural sunlight irradiation. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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