- Increased wear resistance for DLC film when DND added
- DNDs enable to obtain better electrochemical sensors compared to other DLC films
- DNDs on the surface enable richer surface chemistry in order to functionalize DLC
- Mechanical: Extremely hard coating (harder than ta-C). Might obviate the need for diamond coatings in some cases. Tribologically favourable coating for gears and shafts.
- Electrical: Coating shows promise electrochemically to fashion thin film sensors. With the proper functionalization of the DNDs, arrays for a lab-on-a-chip is possible.
- Optical: Coating photonic crystal fibers with DND film enhancing waveguiding modes, optical wavelength selection, wavelength conversion and other aspects. Possibly the DND film as optical waveguide on a chip.
- Bio-Material: More favorable growth substrates for cells (such as neurons).
Diamond like Carbon (DLC) films are well known for their high hardness and wear protective properties. Detonation Nanodiamonds (DNDs) are equally well known to have high sp3 content, small size (few nm) and many other interesting properties. Diverse methods have been used to grow nano and ultra nano crystalline diamond films for various applications. Here we show a novel method wherein DLC and DNDs have been co-deposited from the same cathode by a Physical Vapour deposition method. Transmission Electron Microscope (TEM) analysis of these films revel the presence of NDs embedded in the matrix of amorphous carbon. Raman spectroscopy indicates that the DND-DLC composite film is of similar quality as DLC film of same thickness. Nanoindentation and nanowear tests on DND-DLC composite films show better performance when compared to DLC films of similar thickness.
Patent pending: PCT/FI2017/050350
Priority: May 6th, 2016
Ajai Iyer, Jarkko Etula, Jari Koskinen
- All carbon hybrid multi-functional composite thin films: Ajai Iyer thesis 2017
- Nanodiamond embedded ta-C composite film by pulsed filtered vacuum arc deposition from a single target: Ajai Iyer et al. Appl. Phys. Lett. 109, 201905 (2016)https://doi.org/10.1063/1.4967985
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