Simultaneous High Sensitivity Sensing of Temperature and Humidity with Graphene Woven Fabrics

Abstract

Temperature and moisture are critical factors for both the environment and living creatures. Most temperature sensors and humidity sensors are rigid. It still remains an unsolved problem to fabricate a flexible sensor that can easily detect temperature and humidity at the same time. In this work, we made a flexible multifunctional temperature and humidity sensor from graphene woven fabrics. The integrated sensor could measure temperature and humidity simultaneously. The temperature-sensing part and the humidity-sensing part were stacked in layer structure, occupying little space and showing good flexibility while exhibiting high sensitivity and very little mutual interference. The different factors that affected the sensing properties of the sensor were examined. The integrated sensor was successfully utilized in several real life application scenarios, which showed its potential for wider use in environment sensing and health monitoring.

A High‐Performances Flexible Temperature Sensor Composed of Polyethyleneimine/Reduced Graphene Oxide Bilayer for Real‐Time Monitoring

“…To date, some researches on skin‐attachable temperature sensors were reported, in which different kinds of materials, including metal nanoparticles/nanowires, graphene, carbon nanotubes (CNTs), polymers (such as poly(3,4‐ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT:PSS)),[5a,10,12,14] and others, have been explored as temperature sensing materials. Among various materials, graphene and its derivatives are wildly applied in temperature sensors owing to its outstanding electrical and thermal properties .…”

“…However, the sensitivities of bare graphene or its derivatives based temperature sensors are unsatisfactory and generally no more than 1.00% °C −1 . In order to obtain superior sensitivity and flexibility of temperature sensor, graphene and its derivatives were composited with other materials, such as PEDOT:PSS, polyurethane (PU), CNTs, polydimethylsiloxane (PDMS),[8b] and cellulose . According to the studies of graphene composite temperature sensor, the maximum sensitivity can achieve ≈1.34% °C −1 , while the highest accuracy can only reach 0.2 °C, still existing a gap to monitor human skin temperature, and the linearity and durability still remain to be improved for the practical use .…”

Physical sensors for skin‐inspired electronics

“…Therefore, there is an urgent demand to develop lightweight, flexible, and stretchable humidity sensors that can be integrated into skin‐inspired electronics. According to the working mechanism, humidity sensors can be divided into resistive‐type sensors, capacitive‐type sensors, moisture‐dependent power generators, and so on. The details of humidity sensors for skin‐inspired electronics are presented in this section.…”

“…Copyright 2019, American Chemical Society. B, Capacitive‐type humidity sensor . Copyright 2017, American Chemical Society.…”

High performance and moisture stable humidity sensors based on polyvinylidene fluoride nanofibers by improving electric conductivity

“…Thus, humidity sensors should be high performing, such as having great linearity, high sensitivity, excellent stability, and fast response time. To improve these important characteristics, many studies have been performed with new materials such as metal oxides , ceramics , carbon materials , and polymer composites . In addition, several approaches have been reported that possess structural advantages, such as mesoporous materials and nanofibers , which have a huge advantage of large surface area.…”