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ZnO Nanotips and Nanorods on Carbon Nanotube/Si Substrates: Anomalous P-type Like Optical Properties of Undoped ZnO Nanotips
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- Authors
- Seung-Sik Park, Jin-Moo Lee, Sung-Jin Kim, Sang-Woo Kim, Min-Su Yi, Sang-Hyeob Kim, Sung Lyul Maeng, Shizuo Fujita
- Issue Date
- 2008-05
- Citation
- Nanotechnology, v.19, no.24, pp.1-5
- ISSN
- 0957-4484
- Publisher
- Institute of Physics (IOP)
- Language
- English
- Type
- Journal Article
- Abstract
- ZnO nanotips and nanorods were grown on screen-printed multi-walled carbon nanotube (MWCNT) films via thermal chemical vapor deposition at relative low growth temperatures of 400 and 500°C. Uniform formation of ZnO nanotips and nanorods occurred on MWCNT-printed Si substrates, but were rarely observed on bare Si substrates at the same growth temperatures. In photoluminescence (PL) measurements, it was found that ZnO nanorods exhibit typical intrinsic optical properties, while ZnO nanotips revealed p-type like luminescence behavior. Acceptor-related emission bands originating from neutral acceptor-bound exciton, free-to-acceptor and donor-acceptor pair transitions are clearly observed in temperature-dependent PL spectra of ZnO nanotips. © IOP Publishing Ltd.
- KSP Keywords
- Carbon nano-tube(CNT), Chemical Vapor Deposition, Chemical vapour deposition(CVD), Donor-acceptor pair(DAP), Luminescence behavior, PL spectra, Si substrate, Undoped ZnO, ZnO nanorod, acceptor-bound exciton, multiwalled carbon nanotubes(MWCNTs)