Organic electrochemical transistor

Figure 2. (a) Schematic cross section of an organic field-effect transistor (OFET). (b) Schematic cross section of an organic electrochemical transistor (OECT). The applied source-drain voltage Vd and gate voltage Vg are also shown. 

In this work, an ionophore-based solvent polymeric membrane is cast on top of the PEDOT PSS channel in order to obtain an ion-selective organic electrochemical transistor (IS-OECT). The polymeric membrane is composed of 2-nitrophenyl octyl ether (o-NPOE, 57.2% ww), poly(vinyl chloride) (PVC, 27.9% ww), V.. V.. V. . V -i( I i i( ycloli( xyl-3-oxapentanedianii(le (ETH 129, 9.6% ww) and potassium tetrakis(4-chlorophenyl)borate (KTpCIPB, 5.4% ww), where ETH 129 is a Ca2+-selective ionophore. The channel region of the transistor that is coated by the Ca2+-selective membrane is immersed in an aqueous solution containing 0.1 M KC1 as a background electrolyte and... 

Fig. 9.6. Schematic description of the Ca2+-selective organic electrochemical transistor. Modulation of the drain current (Ids) by the gate potential (Vg) depends on the ion transport properties of the selective membrane (see Fig 9.7)...

BoUn, M.H., Svennersten, K., Nilsson, D., Sawatdee, A, Jager, E.W., Richter-Dalfifors, A., Berggren, M., 2009. Active control of epithelial cell-density gradients grown along the charmel of an organic electrochemical transistor. Adv. Mater. 21,4379-4382. 

Nilsson, D., M. Chen, T. Kugler, T. Remonen, M. Armgarth, and M. Berggren. 2002. Bistable and dynamic modulation in organic electrochemical transistors. Adv Mater 14 51. 

The operation of electrochemical transistors is based on the switch of neutral and conducting states of materials. For the organic electrochemical transistor, as the oxidation... 

PEDOr PSS- + M + e- O PEDOT + M PSS-Figure 25.10 Principle of function of PEDOT PSS-based organic electrochemical transistor. 

Kim DJ, et al. Organic electrochemical transistor based immunosensor for prostate specific antigen (PSA) detection using gold nanoparticles for signal amplification. Biosensors Bioelectronics 2010 25 2477-82. http //dx.doi.Org/10.1016/j.bios.2010.04.013. 

Modified electrodes for electrocatalytic processes have been prepared from PT/metal hybrid materials [192, 193] and 3-methylPT [194]. Ionic and molecular recognition has been found with some functionalized PTs in selectively modified electrodes for electrocatalytic or electroanalytic applications [195, 196]. Organic electrochemical transistors have been realized with a 3-methylPT film deposited between the source and the drain the drain current is driven by the electrochemi-cally controlled conductivity of the 3-methylPT film [197]. This device has been shown to be sensitive to oxidants and reductants and to amplify signals up to kilohertz frequencies [198]. 

Yang SY, DeFranco JA, Sylvester YA, Gobert TJ, Macaya DJ, Owens RM, Malliaras GG (2009) Integration of a surface-directed microfluidic system with an organic electrochemical transistor array for multi-analyte biosensors. Lab Chip 9 704-708... 

Figure 2 Different configurations for electrical sensors (a) electrochemical sensor (b) chemiresistor (c) organic field-effect transistor and (d) organic electrochemical transistor.

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