Abstract
A method is presented for the fabrication of carbon ink microelectrodes in a composite membrane or thin laminate arrangement. The scheme utilises uv excimer laser photoablation of nanosecond pulse duration at wavelength 248nm to generate the required micro-hole stucture in 12 μm PET film. At laser fluences of the order of 1.0 mJ cm −2, film ablation rates were controlled to 0.4 μm per pulse without thermal deformation of the micro-hole. From a micro-hole template a thick film printing technique is used to produce carbon ink microelectrodes with an inlaid disc geometry. A series of microelectrode devices were constructed by this process with disc diameters ranging from 38 μm down to 7 μm with fabrication precision to 1 μm. The amperometric response of the film based microelectrodes were characterized using standard electrochemical measurements and examined by SEM and optical microscopy. Applications are proposed for the new device in the assembly of electrochemical transducers for environmental or clinical sensors.
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