Fabrication of boron doped diamond microband electrodes for electrochemical detection in a microfluidic channel

The manufacturing and electrochemical characterisation of an array of 20 boron doped nanocrystalline diamond (BNCD) microband electrodes for use in a poly(dimethylsiloxane) (PDMS) based microfluidic system are described. The electrodes were fabricated by plasma etching of a silicon oxide- and BNCD thin film coated silicon wafer and the resulting surface structured silicon wafer was subsequently bonded to the PDMS so that the BNCD microband electrodes were located within the PDMS microchannel. The electrochemical performance of the BNCD electrodes was studied and the electrodes were found to exhibit significantly better stability than previously employed gold microband arrays.

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► Boron doped nanocrystalline diamond microband electrodes in a microchannel.
► Produced by reactive ion etching of diamond and bonding of PDMS channel.
► Evaluated by field driven amperometric mesurements, SEM and AFM.
► Diamond microelectrodes are stable and suitable for electrochemical detection.
► Microchannel can be easily removed and electrodes cleaned for reuse.