Water Soluble Conducting Polymer Field Effect Transistor for Sensor Application

We studied the water soluble polythiophene based conducting polymer field effect transistor for chemical and biosensors at nanoscale. Sodium poly [2-3(thienyl) ethoxy-4-butylsulphonate)] (SPBS) is a water soluble polymer. Electrical transport property as a function of gate voltage was investigated using a home-built nanomanipulator with four nanoprobes, which is connected to a picoammeter and an impedance analyzer. In conjunction with this, we studied molecular and electronic structures by a scanning tunneling microscope. The interface between electrodes and polymer play an important role in the charge transport properties.