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Nanocrystalline diamond thin films deposited by 35 kHz Ar-rich plasmas

AuthorsLópez, J. M.; Gordillo Vázquez, Francisco J. ; Albella, J. M.
Issue Date2002
CitationApplied Surface Science 185: 321- 325 (2002)
AbstractWe give evidence of nanometric size (5-15 nm) crystalline diamonds in carbon thin films obtained at low substrate temperature (15 °C) under the action of low pressure (0.1-0.3 Torr) 35kHz excited CH4/Ar (80-95%) plasmas. The decrease in Ar concentration was found to lead to higher film hardness while crystalline nanodiamonds are observed in a wide interval (1-3.5 h) of deposition times but only for very high Ar concentration (95%). The polycrystalline nanodiamond grains are found over 10-20% within an amorphous carbon matrix. It is suggested that the distribution of nanodiamond grains might be connected to the nonuniform ion energy distribution in the Ar-rich plasma generated at 35 kHz. Morphological and structural features of the deposited films were also investigated. © 2002 Elsevier Science B.V. All rights reserved.
Identifiersdoi: 10.1016/S0169-4332(01)00996-5
issn: 0169-4332
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