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pH sensitivity of nanocrystalline diamond films

✍ Scribed by Christiaens, P. ;Abouzar, M. H. ;Poghossian, A. ;Wagner, T. ;Bijnens, N. ;Williams, O. A. ;Daenen, M. ;Haenen, K. ;Douhéret, O. ;D'Haen, J. ;Mekhalif, Z. ;Schöning, M. J. ;Wagner, P.

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
192 KB
Volume
204
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

The pH‐sensitive properties of hydrogen‐ and oxygen‐terminated nanocrystalline diamond (NCD) films have been investigated using a field‐effect‐based capacitive electrolyte‐diamond‐insulator‐semiconductor (EDIS) structure as transducer. The NCD thin films (100–500 nm) were grown on p‐Si–SiO~2~ substrates by microwave plasma‐enhanced chemical vapour deposition. The electrochemical characterisation of EDIS sensors with NCD films of different thicknesses has been performed in buffer solutions of pH 3 to pH 11 by means of capacitance–voltage and constant–capacitance methods. The developed EDIS sensors with O‐terminated NCD surfaces show an average pH‐sensitivity of 38 mV/pH. A slightly smaller pH‐sensitivity of 29–36 mV/pH was observed for the EDIS structure with H‐terminated NCD surfaces. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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