Effects of Ni-coating on ZnO nanowires: A Raman scattering study

被引：21
作者：
Filippov, S. [1 ]
Wang, X. J. [1 ,2 ]
Devika, M. [3 ]
Reddy, N. Koteeswara [3 ]
Tu, C. W. [3 ,4 ]
Chen, W. M. [1 ]
Buyanova, I. A. [1 ]
机构：
[1] Linkoping Univ, Dept Phys Chem & Biol, S-58183 Linkoping, Sweden
[2] Chinese Acad Sci, Shanghai Inst Tech Phys, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China
[3] Gwangju Inst Sci & Technol, Dept Nanobio Mat & Elect, Kwangju 500712, South Korea
[4] Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA
来源：
JOURNAL OF APPLIED PHYSICS | 2013年 / 113卷 / 21期
基金：
瑞典研究理事会;
关键词：
OPTICAL-PROPERTIES; CO;
D O I：
10.1063/1.4807912
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Structural properties of ZnO/Ni core/shell nanowires (NWs) are studied in detail by means of Raman spectroscopy. It is shown that formation of the Ni shell leads to passivation of surface states responsible for the observed enhanced intensity of the A(1)(LO) Raman mode of the bare ZnO NWs. It also causes appearance of 490 cm(-1) and 710 cm(-1) modes that are attributed to local vibrational modes of a defect/impurity (or defects/impurities). This defect is concluded to be preferably formed in annealed ZnO/Ni NWs and is unlikely to contain a Ni atom, as the same Raman modes were also reported for the Ni-free ZnO nanostructures. From our resonant Raman studies, we also show that the ZnO/Ni core/shell NWs exhibit an enhanced Raman signal with a multiline structure involving A(1)(LO). This observation is attributed to combined effects of an enhanced Frohlich interaction at the ZnO/Ni heterointerface and coupling of the scattered light with local surface plasmons excited in the Ni shell. The plasmonic effect is also suggested to allow detection of carbon-related species absorbed at the surface of a single ZnO/Ni NW, promising for applications of such structures as efficient nano-sized gas sensors. (C) 2013 AIP Publishing LLC.
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页数：6
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