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Examination of the spatially heterogeneous electroactivity of boron-doped diamond microarray electrodes
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Colley, Anna L., Williams, Cara G., Johansson, Ulrika D'H., Newton, Mark E., Unwin, Patrick R., Wilson, Neil R. and Macpherson, Julie V.. (2006) Examination of the spatially heterogeneous electroactivity of boron-doped diamond microarray electrodes. Analytical Chemistry, Vol.78 (No.8). pp. 2539-2548. ISSN 0003-2700
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Official URL: http://dx.doi.org/10.1021/ac0520994
Abstract
Spatial variations in the electrical and electrochemical activity of microarray electrodes, fabricated entirely from diamond, have been investigated. The arrays contain similar to 50-mu m-diameter boron-doped diamond (BDD) disks spaced 250 mu m apart (center to center) in insulating intrinsic diamond supports, such that the BDD regions are coplanar with the intrinsic diamond. Atomic force microscopy (AFM) imaging of the surface reveals a roughness of no more than 10 nm over the array. Each BDD microdisk within the array contains polycrystalline BDD with a variety of different grains exposed. Using conducting-AFM, the conductivity of the different grains was found to vary within a BDD microdisk. Electrochemical imaging of the electroactivity of the microdisk electrodes using scanning electrochemical microscopy operating in substrate generation-tip collection mode revealed that, under apparently diffusion-limited steady-state conditions, there was a small variation in the response between electrodes. However, the majority of electrodes in the array appeared to show predominantly metallic behavior. For the electrodes that showed a lower activity, all grains within the microdisk supported electron transfer, albeit at different rates, as evidenced by studies on the electrodeposition of metallic silver, at potentials far negative of the flat band potential of oxygen-terminated polycrystalline diamond. The possibility of using these array electrodes for steadystate diffusion-limited measurements in electroanalytical applications is far-reaching. However, caution should be exercised in the kinetic analysis of voltammetric measurements, since wide variations in the electroactivity of individual grains are apparent when the potential is below the diffusion-limited value.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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| Divisions: | Faculty of Science > Chemistry Faculty of Science > Physics |
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| Journal or Publication Title: | Analytical Chemistry | ||||
| Publisher: | American Chemical Society | ||||
| ISSN: | 0003-2700 | ||||
| Official Date: | 15 April 2006 | ||||
| Dates: |
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| Volume: | Vol.78 | ||||
| Number: | No.8 | ||||
| Number of Pages: | 10 | ||||
| Page Range: | pp. 2539-2548 | ||||
| Identification Number: | 10.1021/ac0520994 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| URI: | http://wrap.warwick.ac.uk/id/eprint/33658 |
Data sourced from Thomson Reuters' Web of Knowledge
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