期刊
PHYSICS LETTERS A
卷 373, 期 33, 页码 2965-2968出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2009.06.032
关键词
Nano-tetrapods; Multiple injections; Field emission
资金
- Research Grant Council of Hong Kong [HKUST6069/02P, F-HK18/03T]
The arms of CdSe nano-tetrapods can be greatly elongated with the core diameters and arm width unchanged by multiple injections. Room-temperature absorption and photoluminescence (PL) spectra of tetrapods with different arm lengths show that these tetrapods have almost the same core size, which is consistent with the high resolution TEM results. Field emission characteristics show that the onset field required drawing a current density of similar to 0.1 mu A cm(-2) from CdSe nano-tetrapods with different arm lengths are 22 V mu m(-1), 9 V mu m(-1), and 4 V mu m(-1), respectively, and the field enhancement factors are determined to be about 218, 554, and 946, respectively. Results show that the longer is the arm of the tetrapods, the lower the turn-on field and the higher the field enhancement factor. (c) 2009 Elsevier B.V. All rights reserved.
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