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Title: Biosensing properties of nanocrystalline diamond film grown on polycrystalline diamond electrodes
Authors: Siew, P.S.
Loh, K.P. 
Poh, W.C.
Zhang, H. 
Keywords: Biosensors
Carbon nanotubes
Cyclic voltammetry
Nanocrystalline diamond
Issue Date: Mar-2005
Citation: Siew, P.S., Loh, K.P., Poh, W.C., Zhang, H. (2005-03). Biosensing properties of nanocrystalline diamond film grown on polycrystalline diamond electrodes. Diamond and Related Materials 14 (3-7) : 426-431. ScholarBank@NUS Repository.
Abstract: Micron-sized polycrystalline diamond electrode typically exhibits poor and sluggish response to ascorbic acid (L-AA) and cannot resolve voltammetrically mixtures of biomolecules (e.g. L-AA, dopamine (DA) and uric acid (UA)). This paper investigates a simple re-growth strategy to modify the polycrystalline diamond surfaces for making an active biosensing electrode. A thin, nominally undoped nanocrystalline diamond (NCD) layer has been grown on the surface of boron-doped polycrystalline diamond substrate using a high substrate bias voltage (-200 V) and a 12% hydrocarbon-in-hydrogen gas feed. We found that the over-potential for L-AA oxidation has been reduced from 400 to 60 mV and that voltammetric differentiation of DA and UA, or UA and L-AA, is possible on the NCD-modified diamond electrode. © 2004 Elsevier B.V. All rights reserved.
Source Title: Diamond and Related Materials
ISSN: 09259635
DOI: 10.1016/j.diamond.2004.11.016
Appears in Collections:Staff Publications

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