Literature DB >> 16573106

Ultra-smooth nanostructured diamond films deposited from He/H2/CH4/N2 microwave plasmas.

Valery V Konovalov1, Andrew Melo, Shane A Catledge, Shafiul Chowdhury, Yogesh K Vohra.   

Abstract

Addition of He to a high CH4 content (10.7 vol%) H2/CH4/N2 feedgas mixture for microwave plasma chemical vapor deposition produced hard (58-72 GPa), ultra-smooth nanostructured diamond films on Ti-6AI-4V alloy substrates. Upon increase in He content up to 71 vol%, root mean squared (RMS) surface roughness of the film decreased to 9-10 nm and average diamond grain size to 5-6 nm. Our studies show that increased nanocrystallinity with He addition in plasma is related to plasma dilution, enhanced fragmentation of carbon containing species, and enhanced formation of CN radical.

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Year:  2006        PMID： 16573106      PMCID： PMC2430513     

Source DB:  PubMed          Journal:  J Nanosci Nanotechnol        ISSN： 1533-4880


  7 in total

1.  Synthesis and Mechanical Wear Studies of Ultra Smooth Nanostructured Diamond (USND) Coatings Deposited by Microwave Plasma Chemical Vapor Deposition with He/H(2)/CH(4)/N(2) Mixtures.

Authors:  S Chowdhury; J Borham; S A Catledge; A W Eberhardt; P S Johnson; Y K Vohra
Journal:  Diam Relat Mater       Date:  2008       Impact factor: 3.315

2.  Mesenchymal stem cell interaction with ultra-smooth nanostructured diamond for wear-resistant orthopaedic implants.

Authors:  William C Clem; Shafiul Chowdhury; Shane A Catledge; Jeffrey J Weimer; Faheem M Shaikh; Kristin M Hennessy; Valery V Konovalov; Michael R Hill; Alfred Waterfeld; Susan L Bellis; Yogesh K Vohra
Journal:  Biomaterials       Date:  2008-05-19       Impact factor: 12.479

3.  In vitro studies on the effect of particle size on macrophage responses to nanodiamond wear debris.

Authors:  Vinoy Thomas; Brian A Halloran; Namasivayam Ambalavanan; Shane A Catledge; Yogesh K Vohra
Journal:  Acta Biomater       Date:  2012-02-02       Impact factor: 8.947

4.  Preliminary tribological evaluation of nanostructured diamond coatings against ultra-high molecular weight polyethylene.

Authors:  Michael R Hill; Shane A Catledge; Valeriy Konovalov; William C Clem; Shafiul A Chowdhury; Brandon S Etheridge; Andrei Stanishevsky; Jack E Lemons; Yogesh K Vohra; Alan W Eberhardt
Journal:  J Biomed Mater Res B Appl Biomater       Date:  2008-04       Impact factor: 3.368

5.  Synthesis of ultrasmooth nanostructured diamond films by microwave plasma chemical vapor deposition using a He/H(2)/CH(4)/N(2) gas mixture.

Authors:  S Chowdhury; Damon A Hillman; Shane A Catledge; Valery V Konovalov; Yogesh K Vohra
Journal:  J Mater Res       Date:  2006-10       Impact factor: 3.089

6.  Nanostructured diamond coatings for orthopaedic applications.

Authors:  S A Catledge; V Thomas; Y K Vohra
Journal:  Woodhead Publ Ser Biomater       Date:  2013

7.  Rapid Growth of Nanostructured Diamond Film on Silicon and Ti-6Al-4V Alloy Substrates.

Authors:  Gopi K Samudrala; Yogesh K Vohra; Michael J Walock; Robin Miles
Journal:  Materials (Basel)       Date:  2014-01-13       Impact factor: 3.623
  7 in total

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