Nanotechnology Conference and Trade Show - Nanotech 2006
> Program > Technical Conferences > Business & Development > Nano Impact Workshop > Nanotech Job Fair > Expo
Program
Sessions
Sunday
Monday
Tuesday
Wednesday
Thursday
Index of Authors
Index of Keywords
Confirmed Speakers
Conferences & Symposia

Conference Proceedings

Conference Technical Proceedings

Porous Diamond-Like Carbon Nanolayers with Excellent Anti-Corrosion and Barrier Performance

G.A. Abbas, P. Papakonstantinou, J.A. McLaughlin
University of Ulster, UK

Keywords:
DLC, corrosion, density, Si-incorporation

Abstract:
We investigated the surface modification of Al2O3-TiC substrates using Si-incorporated hydrogenated amorphous carbon coatings (Si-aC:H) synthesized by radio frequency plasma enhanced chemical vapor deposition (PECVD). The precursor gas was a mixture of C2H2/Ar plasma and tetramethylsilane (TMS). We have demonstrated that TMS-incorporation causes a massive reduction in the density and a complete elimination in of the films’ residual-stress. Also, a hydrogenation process was established by ERDA technique. The increased hydrogen concentration associated with the TMS precursor was responsible for a rise in density of voids and an associated reduction in the connectivity (i.e., porosity) and stress release of the carbon network. In contradiction to the dramatic reduction in density and increase density of voids in the films, TMS-incorporation also led to significant improvements in the corrosion resistance of Al2O3-TiC substrates. The electrochemical impedance spectroscopy (EIS) showed an increase in the charge transfer resistance and reduction in the anodic current of the polarization curves. The reason for the enhanced corrosion resistance is thought to be related to the formation of charge-denuded layer that forms by a reaction between the porous Si-aC:H and either air or the aqueous solution. In summary our results contradict the concept that high density coatings are expected to display good corrosion and gas barrier performance.

Back to Program

Sessions Sunday Monday Tuesday Wednesday Thursday Authors

Nanotech 2006 Conference Program Abstract

 
Nanotechnology Conference | Terms of use | Privacy policy | Contact | NSTI Home
Program | Technical Conferences | Business & Development | Nano Impact Workshop | Nanotech Job Fair | Expo |
Nanotech 2006 Home | Press Room | Venue | Subscribe | Site Map
Names, and logos of other organizations are the property of those organizations and not of NSTI.
This event is not open to the general public and NSTI reserves the right to refuse admission and participation to any individual.