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Boron δ-doped (111) diamond solution gate field effect transistors.

Edgington, R; Ruslinda, AR; Sato, S; Ishiyama, Y; Tsuge, K; Ono, T; Kawarada, H; (2012) Boron δ-doped (111) diamond solution gate field effect transistors. Biosensors and Bioelectronics , 33 (1) 152 - 157. 10.1016/j.bios.2011.12.044. Green open access

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A solution gate field effect transistor (SGFET) using an oxidised boron δ-doped channel on (111) diamond is presented for the first time. Employing an optimised plasma chemical vapour deposition (PECVD) recipe to deposit δ-layers, SGFETs show improved current-voltage (I-V) characteristics in comparison to previous similar devices fabricated on (100) and polycrystalline diamond, where the device is shown to operate in the enhancement mode of operation, achieving channel pinch-off and drain-source current saturation within the electrochemical window of diamond. A maximum gain and transconductance of 3 and 200μS/mm are extracted, showing comparable figures of merit to hydrogen-based SGFET. The oxidised device shows a site-binding model pH sensitivity of 36 mV/pH, displaying fast temporal responses. Considering the biocompatibility of diamond towards cells, the device's highly mutable transistor characteristics, pH sensitivity and stability against anodic oxidation common to hydrogen terminated diamond SGFET, oxidised boron δ-doped diamond SGFETs show promise for the recording of action potentials from electrogenic cells.

Type: Article
Title: Boron δ-doped (111) diamond solution gate field effect transistors.
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.bios.2011.12.044
Publisher version: http://dx.doi.org/10.1016/j.bios.2011.12.044
Language: English
Additional information: This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Keywords: Action Potentials, Biosensing Techniques, Boron, Diamond, Electrochemical Techniques, Hydrogen-Ion Concentration, Oxidation-Reduction, Transistors, Electronic
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
URI: http://discovery.ucl.ac.uk/id/eprint/1343080
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