Hutton, Laura A., Vidotti, Marcio, Iacobini, James G., Kelly, C. (Chris), Newton, Mark E., Unwin, Patrick R. and Macpherson, Julie V.. (2011) Fabrication and characterization of an all-diamond tubular flow microelectrode for electroanalysis. Analytical Chemistry, Vol.83 (No.14). pp. 5804-5808. ISSN 0003-2700

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Abstract

The development of the first all-diamond hydrodynamic flow device for electroanalytical applications is described. Here alternate layers of intrinsic (insulating), conducting (heavily boron doped), and intrinsic polycrystalline diamond are grown to create a sandwich structure. By laser cutting a hole through the material, it is possible to produce a tubular flow ring electrode of a characteristic length defined by the thickness of the conducting layer (for these studies similar to 90 mu m). The inside of the tube can be polished to 17 +/- 10 nm surface roughness using a diamond impregnanted wire resulting in a coplanar, smooth, all-diamond surface. The steady-state limiting current versus volume flow rate characteristics for the one electron oxidation of FcTMA(+) are in agreement with those expected for laminar flow in a tubular electrode geometry. For dopamine detection, it is shown that the combination of the reduced fouling properties of boron doped diamond, coupled with the flow geometry design where the products of electrolysis are washed away downstream of the electrode, completely eradicates fouling during electrolysis. This paves the way for incorporation of this flow design into online electroanalytical detection systems. Finally, the all diamond tubular flow electrode system described here provides a platform for future developments including the development of ultrathin ring electrodes, multiple apertures for increased current response, and multiple, individually addressable ring electrodes incorporated into the same flow tube.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics Q Science > QD Chemistry T Technology > TP Chemical technology
Divisions:	Faculty of Science > Chemistry Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Thin films -- Electric properties, Electrodes, Carbon, Ultramicroelectrodes, Chromatographic analysis, Capillary electrophoresis, Electrochemistry, Diamonds -- Electric properties
Journal or Publication Title:	Analytical Chemistry
Publisher:	American Chemical Society
ISSN:	0003-2700
Date:	15 July 2011
Volume:	Vol.83
Number:	No.14
Page Range:	pp. 5804-5808
Identification Number:	10.1021/ac2010247
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	BAE SYSTEMS (Firm), Engineering and Physical Sciences Research Council (EPSRC), Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Advantage West Midlands (AWM), European Regional Development Fund (ERDF)
Grant number:	200261/2008-8 (CNPq)
URI:	http://wrap.warwick.ac.uk/id/eprint/38673

Data sourced from Thomson Reuters' Web of Knowledge

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