Mallik, Awadesh Kumar and Bysakh, Sandip and Pal, Kalyan Sundar and Dandapat, Nandadulal and Guha, Bichitra Kumar and Datta, Someswar and Basu, Debabrata (2013) Synthesis and characterisation of freestanding diamond coatings. Indian Journal of Engineering and Materials Sciences, 20 (6). pp. 522-532. ISSN 0971-4588

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Abstract

Freestanding polycrystalline diamond (PCD) coatings are of immense technological importance. PCD has been grown over silicon substrates by microwave plasma assisted chemical vapor deposition (MWPACVD) process. The coatings are grown by suitable optimisation of the growth parameters of a 915 MHz microwave reactor. Thereafter, 1:1:1 solution of hydrofluoric acid (HF); nitric acid (HNO3) and acetic acid (CH3COOH) is used to etch out the silicon wafer from the backside of the coating. Hereby, freshly generated nucleation surface, could be characterised by scanning electron microscopy (SEM), atomic force microscopy (AFM), Raman spectroscopy and stylus profilometer and could be compared with the growth side. It is found that both the nucleation side and growth side are of very high quality (full width at half maxima, i.e., FWHM < 8 cm(-1)). The growth side is (111) textured, whereas, the nucleation side is very smooth with embedded detonation-nano-diamond (DND) agglomerates. These freestanding coatings are successfully laser cut into different geometrical shapes. They are found to be optically translucent having high refractive index. Cross-sectional microscopy of the laser cut edge reveals novel melting features of the CVD grown diamond columns.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	21 May 2015 07:00
Last Modified:	21 May 2015 07:00
URI:	http://cgcri.csircentral.net/id/eprint/2829

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