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Diamond film coated on WC/Co tools by double bias-assisted hot filament CVD
V. Malcher,A. Mrka,A. Kromka,A. atka,J. Jan?k 한국물리학회 2002 Current Applied Physics Vol.2 No.3
WC6%Co cutting tool inserts were coated with diamond lms using a double bias-assisted hot-lament chemical vapor de-growth of diamond follows the pretreatment and nucleation of the substrate. The presented operating parameters allow to sub-stantially suppress the presence of amorphous carbon and/or graphite phases in the diamond lms deposited on WC/Co tools. Thesubstrate temperature of. 700 .C, and a low methane concentration result in a sharp diamond Raman peak centered at 133334cm. 1 with FWHM of 67 cm. 1 electron microscopy, optical microscopy, and micro-Raman spectroscopy.. 2002 Elsevier Science B.V. All rights reserved.
Varga, M.,Stehlik, S.,Kaman, O.,Izak, T.,Domonkos, M.,Lee, D.S.,Kromka, A. Elsevier 2017 Carbon Vol.119 No.-
<P>Porous and self-standing structures are highly promising as membranes, electrodes, high sensitivity gas sensors, and supercapacitors due to their high surface area and tuneable surface properties. Composition of such materials with a polycrystalline diamond film may provide new functionalities for biological and electrochemical applications. However, the diamond growth on foreign substrates as a pinhole-free continuous thin film is still a not a trivial task. Here, we present a successful templated deposition process of polycrystalline diamond film on reticulated vitreous carbon foam (C-foam). Samples of polyvinyl alcohol (PVA) polymer-nanodiamond (ND) mixtures with various ND concentrations were prepared and characterized by means of optical spectroscopy, Raman spectroscopy, dynamic light scattering, zeta potential and pH measurements. The ND/PVA mixtures are employed for the preparation of diamond film by microwave plasma enhanced chemical vapour deposition process, and the effect of their composition (NDs/PVA ratio) on the nucleation (seed density, clustering) and diamond growth (substrate etching, polymer transformation) is analysed. The nucleation, early-stage of diamond growth and the resulting diamond-coated C-foams are characterized by scanning electron microscopy, atomic force microscopy and Raman spectroscopy. The obtained results underline the importance to tailor the NDs/PVA ratio for a well-defined three-dimensional C-foam coverage with the continuous diamond film. (C) 2017 Elsevier Ltd. All rights reserved.</P>