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Started by gozdz,antoni s
Mon, 25 Jan 1993 21:47
Re: Amorphous diamond film
Author: gozdz,antoni s
Date: Mon, 25 Jan 1993 21:47
Date: Mon, 25 Jan 1993 21:47
37 lines
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1776 bytes
In article <C1F58B.MF4@brunel.ac.uk> mt90dac@brunel.ac.uk (Del Cotter) writes: >What colour is amorphous diamond film? Just curious; we had a lecture on >phase equilibria today and the question came up. > >Any other gee-whiz facts on the manufacture/properties/applications of ADF? > > ', ,',' | Del Cotter mt90dac@brunel.ac.uk | ', ,',' I think you mean "amorphous diamond-like films", a.k.a. "hydrogenated amorphous carbon", "alpha-C:H", etc. In thin layers, i.e., 50-500 nm, they can be transparent with yellow-to-brown tint, but depending on the deposition conditions, either almost clear or metallic-looking films can also be made. They are easily deposited by high-frequency discharges (100 kHz - 2.45 GHz) from any hydrocarbon gas at rather low pressures (0.001 - 10 Torr). They are VERY hard (8-9 on the Mohs' scale (Si is 7, various carbides 8-9, diamond 10), VERY smooth, electrically insulating, chemically resistant, hydrophobic, are very good gas transport barriers, etc etc. Fun to work with, too. People have used such films for tool, lens, and optical fiber coatings, medical implant coatings, transfer layers in high-resolution lithography, to fabricate ultraminiature stressor elements in quantum structure studies, etc. There is a CRC book on the subject. Hope it helps. Tony tony2@cc.bellcore.com
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