Journal
SURFACE & COATINGS TECHNOLOGY
Volume 324, Issue -, Pages 257-263Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2017.05.084
Keywords
ZnO nanorods; ZnO@Ag nanorod arrays; Charge transfer; Donor-bridge-acceptor; SERS
Funding
- National Natural Science Foundation of China [51606158, 11604311, 60908023, 11375159]
- Southwest University of Science and Technology [14zx7144]
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We report a simple magnetron sputtering method to fabricate large-scale vertically aligned ZnO@Ag nanorods (NRs) arrays using aligned ZnO-NRs arrays as a template. Via changing the thickness of Ag film, the density of Ag nanoparticles (NPs) on the surface of ZnO-NRs arrays can be readily tuned. Due to synergistic and charge transfer (CT) effect of the adjacent Ag NPs and ZnO-NRs, the optimized ZnO@Ag-NRs arrays employing Ag film with 15 nm thickness show the best surface-enhanced Raman scattering (SERS) for 4-aminothiophenol (4-ATP). The considerable SERS enhancement of the 4-ATP is ascribed to the CT between the 4-ATP and Ag NPs through the ZnO-NRs. With the help of the valence band of ZnO, the photo-induced electrons from the Ag NPs can be transferred to the lowest unfilled orbital (LUMO) of 4-ATP, forming the so-called donor-bridge-acceptor system. The present research is not only beneficial to the development of ZnO-NRs arrays as a nontoxic, biocompatible, highly SERS active substrate, but also helpful to study the CT behavior between Ag and ZnO for optoelectronic chemistry. (C) 2017 Elsevier B.V. All rights reserved.
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