Fast response and highly sensitive flexible humidity sensor based on nanocomposite film of MoS2 and graphene oxide

TL;DR

This paper presents a flexible, highly responsive humidity sensor using a MoS2/GO nanocomposite film, demonstrating fast response times, high stability, and broad humidity range detection suitable for human respiration and proximity sensing.

Contribution

The study introduces a novel MoS2/GO composite film sensor with optimized volume ratio, achieving superior performance over traditional GO-based sensors in response speed, stability, and ease of fabrication.

Findings

High responsivity (~98%) at optimal ratio

Fast response/recovery times (1.3/12.1 s)

Wide humidity detection range (33%-98% RH)

Abstract

Graphene oxide (GO)-based humidity sensors are attracting widespread attention due to their high responsivity and low cost. However, GO-based humidity sensors generally suffer from slow response and recovery as well as poor stability,etc. Here, we reported a flexible resistive humidity sensor based on a MoS2/GO composite film that was fabricated by mixing different volumes of MoS2 and GO dispersions with adjustable volume ratios. The MoS2/GO composite film has been used as a sensing layer on screen-printed interdigital electrodes. The results show that the best device performance was achieved at a dispersion volume of 0.05 mL with the MoS2/GO volume ratio of 5:1, featuring high responsivity (~98%), fast response/recovery time (1.3/12.1 s), excellent stability and low cost. Further, the humidity sensor exhibits good linearity over a wide humidity range (33% RH-98% RH) at room temperature and can be fabricated easily and feasibly. The application of the humidity sensors we prepared in human respiration detection and human fingertip proximity detection has been demonstrated. These findings indicate the great potential of the composite of MoS2/GO in developing the next generation of high-performance humidity sensors.