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Title: ZnO tip-coated carbon nanotubes core-shell structures for photoluminescence and electron emission properties
Authors: Tan, Z.
Chua, D.H.C. 
Issue Date: 2011
Citation: Tan, Z., Chua, D.H.C. (2011). ZnO tip-coated carbon nanotubes core-shell structures for photoluminescence and electron emission properties. Journal of the Electrochemical Society 158 (4) : K112-K116. ScholarBank@NUS Repository.
Abstract: A multifunctional ZnO tip-coated carbon nanotubes (CNT) core-shell structure was synthesized for the application of a CNT-based device with photoluminescence and field emission properties. The synthesis first includes the growth of vertically aligned carbon nanotubes core by plasma-enhanced chemical vapor deposition and then the deposition of ZnO shell by radio-frequency magnetron sputtering. Transmission electron microscope showed that the ZnO shell formed a polycrystalline coating with bead-shaped nanoparticles on nanotube tips. As the sputtering time increases, the bead-shaped coating becomes a thick layer ZnO film fully encapsulating the CNT tips. Improved threshold field of 3.20 V/m was measured, compared to carbon nanotubes without ZnO coating at 4.90 V/m. A monochromatic photoluminescence peak in the ultraviolet region (∼ 370 nm) was obtained and a gradual blueshift was observed with increasing ZnO coating thickness. The coexistence of electron field emission and photoluminescence has the potential for application in dual-functional devices. We further show that full-length encapsulation is not necessary. In this application, a thin tip-coating is sufficient to observe the unique properties. © 2011 The Electrochemical Society.
Source Title: Journal of the Electrochemical Society
ISSN: 00134651
DOI: 10.1149/1.3552696
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