期刊
SMALL
卷 9, 期 17, 页码 2926-2936出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201202547
关键词
hydrogen generation; ZnO; Ag; plasmonics; femtosecond-laser direct-write; silver oxide
类别
资金
- National Science Council of Taiwan [NSC 101-2113-M-002-014-MY3, 100-2923-M-002-007-MY3, 101-2112-M-002-023-, 101-2911-I-002-107, NSC 101-3113-P-002-021]
- National Center for Theoretical Sciences, Taipei Office, Molecular Imaging Center of National Taiwan University
- National Center for High-Performance Computing, Taiwan
- Research Center for Applied Sciences, Academia Sinica, Taiwan
A new fabrication strategy in which Ag plasmonics are embedded in the interface between ZnO nanorods and a conducting substrate is experimentally demonstrated using a femtosecond-laser (fs-laser)-induced plasmonic ZnO/Ag photoelectrodes. This fs-laser fabrication technique can be applied to generate patternable plasmonic nanostructures for improving their effectiveness in hydrogen generation. Plasmonic ZnO/Ag nanostructure photoelectrodes show an increase in the photocurrent of a ZnO nanorod photoelectrodes by higher than 85% at 0.5 V. Both localized surface plasmon resonance in metal nanoparticles and plasmon polaritons propagating at the metal/semiconductor interface are available for improving the capture of sunlight and collecting charge carriers. Furthermore, in-situ X-ray absorption spectroscopy is performed to monitor the plasmonic-generating electromagnetic field upon the interface between ZnO/Ag nanostructures. This can reveal induced vacancies on the conduction band of ZnO, which allow effective separation of charge carriers and improves the efficiency of hydrogen generation. Plasmon-induced effects enhance the photoresponse simultaneously, by improving optical absorbance and facilitating the separation of charge carriers.
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