Additive Manufacturing of Stretchable Polyurethane/Graphene/Multiwalled Carbon Nanotube-Based Conducting Polymers for Strain Sensing

Abstract

The current flexible sensor plays an indispensable role in human health monitoring, and the development of highperformance sensors requires the advantages of materials and structures. The purpose of this study is to use digital light processing (DLP) to prepare flexible sensors with pore structures by dispersing the two fillers in the thermoplastic polyurethane (TPU) lightsensitive resin. This study uses graphene (GN) and multi-wall carbon nanotubes (MWCNTs) as the addition of flexible resin materials for phase-based preparation, and uses digital optical curing treatment technology to achieve rapid preparation of flexible sensors with special porous structures. Results showed that 1.2 wt % MWCNTs-GN/TPU material showed excellent sensing performance. The resistivity of the composite is 1.74 × 10 4 Ω cm. The sensitivity coefficient was 1.8464; the ductility was 45%; and the low lag coefficient was only 9%. The preparation of porous flexible sensors has higher sensitivity and more suitable for human body. This method is expected to provide new ideas for the rapid formation of flexible sensors.

Flexibly stretchable acrylic resin elastomer films for efficient electromagnetic shielding and photothermal conversion

“…For the above situation, we put forward a reasonable conjecture that the original flat SWCNT conductive network will be reconstructed as the film shrinks and stretches in real time. 53 As shown in Fig. 2b and c, the carbon tubes that were initially cross-linked may be pulled apart, causing the local conductive network to be destroyed, which is not conducive to the formation of conductive paths in the material and weakens the electromagnetic shielding performance of the film.…”

3D Printed Graphene and Graphene/Polymer Composites for Multifunctional Applications

“…With problem of temperature disturbance overcame, this strain sensor exhibited a high sensitivity (gauge factor = 14,550.2 at 100% strain), a wide working range (1–100%), a quick response time (170 ms) and a high durability (10,000 loops). DLP-manufactured graphene/CNT/TPU composites for high-speed complex strain sensors were reported by Liu et al [ 167 ], providing ideas for rapid fabrication of personalized customized wearable electronic devices.…”

Strain Sensors for Human Movement Detection Based on Fibrous Membranes Comprising Thermoplastic Polyurethane, Ag Nanoparticles, and Carbon Nanotubes

“…To develop stretchable strain sensors, various conductive fillers are incorporated into TPU fibrous membranes to impart electrical conductivity. So far, metal materials, 32,33 conductive polymers, 34,35 carbon nanotubes, 36 graphene, 37 and MXene 38 have been commonly used as conductive fillers. Among them, lowdimensional nanomaterials such as metal nanoparticles can effectively enhance the sensitivity of strain sensors due to their outstanding electrical conductivity and small dimensions.…”