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Title: Monochromatic photoluminescence obtained from embedded ZnO nanodots in an ultrahard diamond-like carbon matrix
Authors: Hsieh, J.
Chua, D.H.C. 
Tay, B.K.
Teo, E.H.T.
Tanemura, M.
Keywords: Cathodic arc discharge
Diamond-like carbon
Optical properties characterization
Issue Date: Feb-2008
Citation: Hsieh, J., Chua, D.H.C., Tay, B.K., Teo, E.H.T., Tanemura, M. (2008-02). Monochromatic photoluminescence obtained from embedded ZnO nanodots in an ultrahard diamond-like carbon matrix. Diamond and Related Materials 17 (2) : 167-170. ScholarBank@NUS Repository.
Abstract: At room temperature, we observe the self assembly of nanoclusters in an amorphous matrix using a vacuum deposition technique. Self-assembled ZnO nanoclusters embedded in hard diamond-like amorphous carbon thin films, deposited by high vacuum Filtered Cathodic Vacuum Arc (FCVA) technique at room temperature without post-processing, have been observed. A selective self assembly of metal and oxygen ions in a 3-element plasma was observed. XPS distinctly showed presence of ZnO and DLC-mixture in 5, 7 and 10 at.% Zn (in target) films while maintaining high sp3 content. This in turn improved the Young's modulus value of the ZnO nanoclusters embedded in DLC film (~ 220 GPa) compared to bulk ZnO (~ 110 GPa). Films with ZnO detected were observed to exhibit absorption edge at 377 nm monochromatic UV light emissions. This corresponded to a band gap value of about 3.30 eV. The emission with greatest intensity (after normalization) was detected from 10 at.% Zn (in target) film where presence of ZnO nanoclusters (~ 40 nm) in DLC matrix were confirmed by TEM. This showed that well-defined crystalline ZnO nanoclusters contributed to strong PL signal. Strong monochromatic emissions detected hinted that no defect states were present. © 2007 Elsevier B.V. All rights reserved.
Source Title: Diamond and Related Materials
ISSN: 09259635
DOI: 10.1016/j.diamond.2007.11.015
Appears in Collections:Staff Publications

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