Electrochemical and antimicrobial properties of diamondlike carbon-metal composite films
| Autor: | M.L. Morrison, R.A. Buchanan, P.K. Liaw, C.J. Berry, R.L. Brigmon, L. Riester, H. Abernathy, C. Jin, R.J. Narayan |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Nanocomposite
Materials science Passivation Mechanical Engineering Composite number chemistry.chemical_element Nanoparticle Nanotechnology General Chemistry Electronic Optical and Magnetic Materials Corrosion Pulsed laser deposition chemistry Chemical engineering Materials Chemistry Electrical and Electronic Engineering Thin film Platinum |
| Zdroj: | Diamond and Related Materials. 15:138-146 |
| ISSN: | 0925-9635 |
| DOI: | 10.1016/j.diamond.2005.08.031 |
| Popis: | Implants containing antimicrobial metals may reduce morbidity, mortality, and healthcare costs associated with medical device-related infections. We have deposited diamondlike carbon-silver (DLC-Ag), diamondlike carbon-platinum (DLC-Pt), and diamondlike carbon-silver-platinum (DLC-AgPt) thin films using a multicomponent target pulsed laser deposition process. Transmission electron microscopy of the DLC-silver and DLC-platinum composite films revealed that the silver and platinum self-assemble into nanoparticle arrays within the diamondlike carbon matrix. The diamondlike carbon-silver film possesses hardness and Young's modulus values of 37 GPa and 331 GPa, respectively. The diamondlike carbon-metal composite films exhibited passive behavior at open-circuit potentials. Low corrosion rates were observed during testing in a phosphate-buffered saline (PBS) electrolyte. In addition, the diamondlike carbon-metal composite films were found to be immune to localized corrosion below 1000 mV (SCE). DLC-silver-platinum films demonstrated exceptional antimicrobial properties against Staphylococcus bacteria. It is believed that a galvanic couple forms between platinum and silver, which accelerates silver ion release and provides more robust antimicrobial activity. Diamondlike carbon-silver-platinum films may provide unique biological functionalities and improved lifetimes for cardiovascular, orthopaedic, biosensor, and implantable microelectromechanical systems. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect