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Selective photochemical synthesis of Ag nanoparticles on position-controlled ZnO nanorods for the enhancement of yellow-green light emission

Title
Selective photochemical synthesis of Ag nanoparticles on position-controlled ZnO nanorods for the enhancement of yellow-green light emission
Authors
Park, Hyeong-HoZhang, XinLee, Keun WooSohn, AhrumKim, Dong-WookKim, JoondongSong, Jin-WonChoi, Young SuLee, Hee KwanJung, Sang HyunLee, In-GeunCho, Young-DaeShin, Hyun-BeomSung, Ho KunPark, Kyung HoKang, Ho KwanPark, Won-KyuPark, Hyung-Ho
Ewha Authors
김동욱
SCOPUS Author ID
김동욱scopus
Issue Date
2015
Journal Title
NANOSCALE
ISSN
2040-3364JCR Link2040-3372JCR Link
Citation
vol. 7, no. 48, pp. 20717 - 20724
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
A novel technique for the selective photochemical synthesis of silver (Ag) nanoparticles (NPs) on ZnO nanorod arrays is established by combining ultraviolet-assisted nanoimprint lithography (UV-NIL) for the definition of growth sites, hydrothermal reaction for the position-controlled growth of ZnO nanorods, and photochemical reduction for the decoration of Ag NPs on the ZnO nanorods. During photochemical reduction, the size distribution and loading of Ag NPs on ZnO nanorods can be tuned by varying the UV-irradiation time. The photochemical reduction is hypothesized to facilitate the adsorbed citrate ions on the surface of ZnO, allowing Ag ions to preferentially form Ag NPs on ZnO nanorods. The ratio of visible emission to ultraviolet (UV) emission for the Ag NP-decorated ZnO nanorod arrays, synthesized for 30 min, is 20.5 times that for the ZnO nanorod arrays without Ag NPs. The enhancement of the visible emission is believed to associate with the surface plasmon (SP) effect of Ag NPs. The Ag NP-decorated ZnO nanorod arrays show significant SP-induced enhancement of yellow-green light emission, which could be useful in optoelectronic applications. The technique developed here requires low processing temperatures (120 degrees C and lower) and no high-vacuum deposition tools, suitable for applications such as flexible electronics.
DOI
10.1039/c5nr05877e
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자연과학대학 > 물리학전공 > Journal papers
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