Chemical derivatization of an array of three gold microelectrodes with polypyrrole: Fabrication of a molecule-based transistor

This document reports the fabrication of a chemically derivatized microelectrode array that can function as a transistor when immersed in an electrolyte solution. The key finding is that a small signal (charge) needed to turn on the device can be amplified. The device to be described mimics the fundamental characteristics of solid state transistor, since the resistance between to contacts can be varied by a signal to be amplified. The chemical transistor is the set of three (drain, gate, and source) Au microelectrodes covered by polypyrrole.