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Physics Express 2014, 4: 1
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Research Article
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Synthesis of ZnO nanoleaf via plasma enhanced reactive evaporation and its structural, optical and field emission properties
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D. Banerjeeb, K. K. Chattopadhyaya,b
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a Thin Films and Nanoscience Laboratory, Department of Physics, Jadavpur University, Kolkata 700 032, India
b School of Material Science and Nanotechnology , Jadavpur University, Kolkata 700 032, India
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Abstract |
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This article reports for the first time the synthesis of ZnO nanoleaf-like structure via plasma enhanced reactive evaporation on both silicon as well on glass substrate. The as-prepared samples were studied by X-ray diffraction, energy dispersive analysis of X-rays, field emission scanning electron microscope, high resolution transmission electron microscope, UV-Vis-NIR spectroscopy and photoluminescence spectroscopy. The direct band gap obtained from the optical transmittance spectra came out to be 3.08 eV thus proving the sample to be a wide band gap material. The as-prepared sample has shown room temperature photoluminescence at 388 nm which was assigned as band-to-band transition. Also the efficient field emission characteristic has been obtained from the sample with a turn-on field ~5.71 V/μm. The field emission characteristics have been analyzed via both Millikan-Lauritsen and Fowler-Nordheim technique and a relation regarding the slope of the corresponding linear fit and enhancement factor between the two plots has been shown.
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Keywords |
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Plasma enhanced evaporation; Zinc oxide; Nano structure; Photoluminescence; Field emission
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