A Highly Stretchable and Sensitive Strain Sensor Based on Dopamine Modified Electrospun SEBS Fibers and MWCNTs with Carboxylation

Abstract

Wearable flexible electronic strain sensor devices have developed rapidly in recent years due to their potential capacity to detect human motion in various situations. However, it still remains still a big challenge to fabricate strain sensors with high sensitivity over a wide workable strain range. In order to meet this challenge, a new type of strain sensor based on elastomer/carbon nanotube composite fiber is reported in this work. Elastomer fibers are initially prepared via the electrospinning of styrene ethylene butene styrene block copolymer (SEBS). The resultant SEBS fibers are then functionalized by sequentially coating with dopamine (DA) coating and carboxyl group (‐COOH) grafted multi‐walled carbon nanotubes (MWCNTs) under vacuum filtration and ultrasonication. Scanning electron microscopy (SEM) and thermogravimetric analysis reveals that a large amount of MWCNTs is firmly bonded onto the SEBS fibers and evenly distributed. SEBS@PDA/MWCNTs composite fibers based strain sensors exhibit excellent performance, including a high gauge factor of 3717 and large workable strain range up to 530%. Furthermore, the developed sensors demonstrate excellent washing fastness and superior sensitivity in monitoring both small strains (e.g., pulse beats and vocal cord vibrations) and large strains (e.g., finger, elbow, and knee bending).

RETRACTED: Influence of Different Rotations of Organic Formamidinium Molecule on Electronic and Optical Properties of FAPbBr3 Perovskite

“…In recent years, a variety of light absorber materials have been studied in both organic and inorganic systems [29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Due to their great processability, wide optical absorption crosssection, and good thermal stability [43][44][45][46][47][48][49][50][51][52][53][54][55][56], hybrid organic-inorganic halide perovskites are regarded as being suitable materials for mesoscopic solar cells [57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72]. They have the general chemical formula ABX 3 , where A is an organic/inorganic cation (e.g., Cs + : cesium, (CH 3 NH 3 ) + : methylammonium, MA + ; (CH(NH 2 ) 2 ) + : formamidinium, FA + ), X is a halogen anion (e.g., X = I − , Br − , Cl − ), and B is a divalent metal cation (e.g., Pb 2+ ) [73]…”

State-of-the-art review of advanced electrospun nanofiber yarn-based textiles for biomedical applications

“…In addition, various drugs and bioactive ingredients can be easily encapsulated into the nanofibers through the electrospinning technique, which can impart nanofibers with predetermined biological behaviors [ 33 , 34 ]. Moreover, a wide variety of post-treatment processes are perfectly suitable for the modification of electrospun nanofibers to further improve the properties and functions of as-prepared nanofibers [ 35 , 36 ]. The direct transformation of electrospun nanofibers into textile yarn-like structures, also named as nanofiber yarns (NYs), provides an innovative routine for renewing and updating the existing microfiber yarns (MYs) made from the traditional melt, dry, and wet spinning techniques [37] .…”

A flexible strain sensor based on conductive TPU/CNTs‐Gr composites

“…The most widely used matrices are thermoplastic polyurethane (TPU), 10 polydimethylsiloxane (PDMS), 11 styrene ethylene butylene styrene copolymers (SEBS), 12 polypropylene (PP) 13 and epoxy resin etc 14 . When compared with other polymer membranes, TPU which exhibits large elongation and good elasticity, can be easily electrospun into fibrous membranes with excellent porosity, ductility, flexibility and mechanical strength 15 .…”