Journal
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
Volume 77B, Issue 2, Pages 273-281Publisher
WILEY
DOI: 10.1002/jbm.b.30448
Keywords
ultrananocrystalline diamond; hermetic coating; implantable retinal microchips; electrochemistry; leakage current; biocompatibility; bioinertness
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In this work, ultrananocrystalline diamond (UNCD) thin films were evaluated for use as hermetic and bioinert coatings for a retinal microchip. These films were deposited on highly conductive Si substrates at different temperatures (from 400 to 800 degrees C), using microwave plasma enhanced chemical vapor deposition with argon-rich Ar/CH4 gas mixtures and different relative amounts of hydrogen (0-20%). Scanning electron microscopy studies showed that all the films are dense and continuous. Results of cyclic voltammetry test revealed that when there was < 2% of hydrogen in the plasma, the film obtained renders the surface electrochemically inactive, with very low leakage currents (similar to 4 X 10(-7) A/cm(2) at +/- 5 V). In addition, in vivo tests of the UNCD-coated Si samples were performed by implanting them in the eyes of rabbits for 4-6 months within the eye physiological environment. According to all these results, it was concluded that UNCD is a promising candidate for use as the encapsulating coatings for implantable retinal microelectronic devices. (c) 2005 Wiley Periodicals, Inc.
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