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Diamond-coated ‘black silicon’ as a promising material for high-surface-area electrochemical electrodes and antibacterial surfaces

May, Paul W.
; 
Clegg, Michael
; 
Silva, Tiago A.
; 
Zanin, Hudson
; 
Fatibello-Filho, Orlando
; 
Celorrio, Veronica
; 
Fermin, David
; 
Welch, Colin C.
; 
Hazell, Gavin
; 
Fisher, Leanne E.
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Affiliation
University of Chester, University of Bristol, Universidade Fedeal de Sao Carlos, Universidade Estadual de Campinas, Oxford Instruments
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Publication Date
2016-08-08
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Natural Sciences
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Abstract
This report describes a method to fabricate high-surface-area boron-doped diamond (BDD) electrodes using so-called ‘black silicon’ (bSi) as a substrate. This is a synthetic nanostructured material that contains high-aspect-ratio nano-protrusions, such as spikes or needles, on the Si surface produced via plasma etching. We now show that coating a bSi surface composed of 15-μm-high needles conformably with BDD produces a robust electrochemical electrode with high sensitivity and high electroactive area. A clinically relevant demonstration of the efficacy of these electrodes is shown by measuring their sensitivity for detection of dopamine (DA) in the presence of an excess of uric acid (UA). Finally, the nanostructured surface of bSi has recently been found to generate a mechanical bactericidal effect, killing both Gram-negative and Gram-positive bacteria at high rates. We will show that BDD-coated bSi also acts as an effective antibacterial surface, with the added advantage that being diamond-coated it is far more robust and less likely to become damaged than Si.
Citation
May, P. W., Clegg, M., Silva, T. A., Zanin, H., Fatibello-Filho, O., Celorrio, V., Fermin, D. J., Welch, C. C., Hazell, G., Fisher, L., Nobbs, A. & Su, B. (2016). Diamond-coated ‘black silicon’ as a promising material for high-surface-area electrochemical electrodes and antibacterial surfaces. Journal of Materials Chemistry B, 4(34), 5737-5746
Publisher
Royal Society of Chemistry
Journal
Journal of Materials Chemistry B
Research Unit
URI
http://hdl.handle.net/10034/622046
DOI
10.1039/C6TB01774F
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PubMed Central ID
Type
Article
Language
en
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ISSN
2050-750X
EISSN
2050-7518
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https://pubs.rsc.org/en/Content/ArticleLanding/2016/TB/C6TB01774F#!divAbstract