A review on graphene strain sensors based on fiber assemblies

Abstract

With the development of wearable electronic devices, electronic-textiles have attracted more and more attentions due to its widely applications in human movement monitoring, health and physical indicators monitoring (e.g. heartbeat, pulse, body temperature, limb movements, and vocalization). As a vital part of electronic textiles, graphene strain sensors that based on fiber assemblies (FGS) is of concern to the researchers due to its well integration of graphene with fibers assemblies, which will inevitably promote the rapid development and widespread applications of next-generation wearable electronic devices. Fiber assemblies exhibit outstanding ability of structural retention and fatigue resistance during wearing and washing, which can provide a large-area affiliated carrier and widespread service platform for the design and application of electronic-textiles. And the graphene endows electronic-textiles with good electrical and mechanical properties. Herein, the previous researches on fabrication, sensing mechanism, sensing performance indexes, and application field of FGS are systematically summarized. Furthermore, the potential difficulties and future development prospect of FGS are summarized and discussed. It is expected that this review is not only a summary of what has been achieved, but also provide a guideline for future development.

Polymer‐assisted fully recyclable flexible sensors

“…Besides, when the device is applied with mechanical stretching, the resistance change is spontaneously determined by the reorganization of carbon nanotubes and the deformation of polyurethane. [34][35][36] For the blending type of electronic sensors, the recycling ability is mainly ascribed to the polymeric matrix, because the blended microparticles or nanoparticles without the polymer assistance commonly present limited performance of shaping or freestanding. In terms of the recycling or reprocessing ability, thermoplastic polymers usually exhibit excellent thermal or solution processing ability due to the considerable fluidity of linear chains at high temperatures, or remarkable solubility in a good solvent.…”

“…Taking the blending system composed of polyurethane elastomer and carbon nanotubes as an example, its resistance can be responded to the external stimuli of both temperature change and light irradiation, which is originally resulted from the conductivity change of carbon nanotube. Besides, when the device is applied with mechanical stretching, the resistance change is spontaneously determined by the reorganization of carbon nanotubes and the deformation of polyurethane 34‐36 …”

The Potential of Graphene Nanoplatelets in the Development of Smart and Multifunctional Ecocomposites

“…All the developed samples were properly characterized by Raman Spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), and Thermogravimetric analysis (TGA). The electrical properties of the developed fibrous structures were evaluated including electrical conductivity, piezoresistive effect (the change in the resistance of materials caused by the structural deformations), and the sensitivity of the materials expressed as Gauge factor (GF) [ 17 ].…”

Printable G‐Putty for Frequency‐ and Rate‐Independent, High‐Performance Strain Sensors

“…In particular, their viscoelasticity can introduce resistance hysteresis, [8,13,18] regardless of the strain considered, and render the gauge factor strongly rate dependent. [19] These are significant problems for strain sensors which require a unique relationship between resistance and strain. A good example of this problem is found with G-putty whose extreme softness results in severe viscoplastic relaxation on straining.…”