Disposable and Highly Sensitive Humidity Sensor Based on PEDOT:PSS/GO Heterostructure

Abstract

This work reports a flexible and disposable high-performance humidity sensor using the poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) and graphene oxide (GO) heterostructure. The fabrication of the sensor is done using a cost-effective and large-scale production methodology, which involves the screen-printing process for electrodes and spin-coating for sensing layer depositions. Contrary to the PEDOT:PSS, the heterostructure sensor exhibits enhanced humidity sensing performance with high response and quicker response time. At room temperature (RT), the sensor exhibits excellent sensitivity of around 3.953%/RH over a detection range from 10% to 60% RH. The device also possesses excellent repeatability, long-term stability, and robustness against temperature variations. These findings suggest that PEDOT:PSS/GO heterostructure holds great potential as an effective sensing material for high-performance humidity sensor development for agriculture, medical, and industrial applications.