Flexible Organic Electrochemical Transistor with Functionalized Inkjet-Printed Gold Gate for Bacteria Sensing

This paper shows for the first time fully printed organic electrochemical transistors (OECTs) on flexible foil with an integrated gold gate. This gate can be selectively functionalized for bio-chemical sensing. The immobilization of antibodies on the printed gold gate for the detection of Escherchia coli (E. coli) cells is demonstrated herein. Concentrations equal to 10e7 CFU/ml and 10e5 CFU/ml have been detected using OECTs. Innovative claims include: (a) the use of inkjetprinted gold electrodes for biosensing; (b) the selective functionalization of the printed gold gate using antibodies; and (c) fast, sensitive detection of bacteria with a costeffective disposable platform.