(Invited) Organic Electrochemical Transistors with Plasmonic Gate Electrodes

Abstract

Recently, organic electrochemical transistors (OECTs) have shown tremendous promise as an attractive biomolecular sensor. They are highly beneficial due to their stability in an aqueous environment. Therefore, they are proposed as a replacement for the existing electrode-based detection techniques for monitoring brain signals. Similarly, plasmonic sensors are known to provide high sensitivity for biosensing. We have recently developed a new optoelectronic sensor called plasmonic OECT that combines the benefits of plasmonic substrates and OECTs on a single platform. This is accomplished by a novel approach of converting the gate electrode as a plasmonic platform. The nanostructured plasmonic gate is fabricated by a simple in-house developed nanoimprinting technique. The plasmonic resonance peak of these nanostructures can be tuned to a given wavelength for biosensing application. In this talk, we will discuss the fabrication and working of plasmonic OECTs and their application in sensing glucose. Employing plasmon resonance to enhance the sensitivity of OECTs is an entirely new direction. It can play a vital role in the detection of biomolecules like viruses and other microorganisms.