MoS2-poly(sodium4-styrenesulfonate) nanocomposite-based humidity sensor for monitoring wound healing

Abstract

In this paper, a humidity sensor with high response, high stability and fast response recovery based on MoS2-PSS hybridized sensitive materials was designed, and preliminarily explored for application in noninvasive monitoring of human wound healing. The modification of PSS promoted the increase of S vacancy defects in the MoS2-PSS hybrid materials, which facilitated the rapid adsorption of water molecules and charge transfer. The edge dangling bonds and PSS in MoS2-PSS hybrid materials jointly enhanced the water molecule adsorption capacity and promoted the rapid formation of chemisorbed water layer on materials surface. The formation of chemical bond between MoS2 and PSS makes the hybrid material more stable in structure. The prevents the loss of hydrophilic material caused by the sensor working in high humidity environment for a long time and improves the stability of the sensor. MoS2-PSS humidity sensor exhibites high response (11097), short response/recovery time (5/6 s), low humidity hysteresis (1.6%), and high stability in the 11%-95% RH range. This study not only promotes the development of high-performance sensors, but may also provide a viable option for noninvasive monitoring of wound healing.