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Microstructure and field emission characteristics of ZnO nanoneedles grown by physical vapor deposition

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

George, A, Kumari, P, Soin, N, Roy, SS and McLaughlin, JAD (2010) Microstructure and field emission characteristics of ZnO nanoneedles grown by physical vapor deposition. Materials Chemistry and Physics, 123 (2-3). p. 634. [Journal article]

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URL: http://dx.doi.org/10.1016/j.matchemphys.2010.05.029

DOI: doi:10.1016/j.matchemphys.2010.05.029

Abstract

Single crystalline zinc oxide (ZnO) nanoneedles have been grown on Au coated Si (1 0 0) substrates in an inert gas atmosphere by physical vapor deposition (PVD) process. A mixture of ZnO and graphite powder was used as precursor for the production of nanoneedles. Their structure has been assessed by a range of techniques including scanning electron microscope (SEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The synthesized ZnO nanoneedles have tip diameter around 30 nm and average length of 5 μm. The XRD patterns and HRTEM measurements revealed the highly crystalline phase of wurtzite single crystalline structure, with a preferred 0 0 0 1 growth direction. Field emission from these nanoneedles was investigated and a low turn on voltage of 5.07 V μm−1 at a current density of 10 μA cm−2 was observed.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:15739
Deposited By:Mrs Ann Blair
Deposited On:21 Sep 2010 11:29
Last Modified:07 Apr 2014 11:26

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