Planar screen-printed electrodes

Screen-Printed Planar screen-printed electrodes (SPEs) were obtained from Biode-... 

Fig. 2 Screen-printed electrodes produced in the author s lab the cell consists of circular graphite working electrode (diameter of 3 mm), a silver pseudo-reference electrode, and a graphite counter electrode. The cell is printed on a planar, polyester substrate (of thickness 450 micron). Each cell is pre-cut by a laser trim. The dimension of each cell is 0.8 cm x 4.5 cm. A standard connector of 2.45 mm pitch can be used with these cells. These sensors show a coefficient of variation (CV) of 5%...

Metters, J.P., Kadara, R.O. and Banks, C.E. (2013) Fabrication of co-planar screen printed microband electrodes. Analyst, 138, 2516. 

A system underpinned by commercially made screen-printed electrochemical cells was described by Palmisano et al. [19]. The cells were converted into biosensors for lactate in milk and yoghurt by addition of an electrochemically polymerised barrier to interference and a layer composed of lactate oxidase, glutaraldehyde and BSA. These steps appeared to have been carried out by hand. As there was no outer diffusion-limiting membrane, the linear range of the sensors was quite small (0-0.7 mM). They were incorporated into a FIA with a microdialysis unit based on a planar membrane and a buffer reservoir (earlier work used a microdialysis fibre with a platinum electrode [29]. The concentration of lactate was determined in various milks (0.27-1.64 mM), and in raw milk (c. 0.5-0.9 mM) left to degrade on the laboratory bench. The recovery of the microdialysis unit, 2.6%, implied that the sensor had an ability to return measurable currents for very low concentrations of lactate. A further implication is that the electro-polymerised layer was very effective at preventing interference. 

In this example, the sensing layer, in the form of a thick porous film, is deposited by applying screen-printing technology onto a planar alumina substrate equipped with interdigitated Pt electrodes on its front, for the... 

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