Durable and Flexible PET‐Based Bending Sensor Obtained by Immobilizing Carbon Nanotubes via Surface Micro‐Dissolution for Body Motion Monitoring

Abstract

Textile-based conductive materials that can retain their electrical conductivity during bending have been extensively investigated and applied in flexible electronics and wearable sensors; however, the fastness of the conductive components in textiles requires improvements. Herein, a facile and effective surface micro-dissolution method is developed to prepare carbon nanotubes (CNTs)-coated PET fabric by embedding CNTs onto the surface of PET fabric. The micro-dissolved layer of the macromolecule served as a physical adhesion agent to firmly immobilize the CNTs on the PET fabric. The CNTs-coated PET fabric exhibited an electrical conductivity of 98.1 Ω □ −1 , durability during washing (over 30 cycles) and abrasion cycles (over 500 cycles), and remained conductive in harsh environments (high temperature, high humidity, water, corrosive liquids, organic solvents). The sensor (CCPFS) assembled by the CNTs-coated PET fabric is flexible (over 500 bending cycles), highly sensitive (1.48 deg −1 ), responsive (100 ms), and showed a relaxation time of 200 ms. The CCPFS is used to monitor movements in human fingers, wrist, elbow, knee, expiration, breathing, and wrist pulses. This research provides a route to manufacture flexible sensors for next-generation intelligent wearable devices.

Non‐Invasive Flexible Electro‐Mechanical Sensors for Human Respiratory Monitoring and Chronic Disease Management

“…This flexible pressure sensor after 100 torsions still show significant flexibility and good electrical conductivity, after strain release, it immediately restored to the original size, making it suitable for application in a variety of strained conditions in flexible electronic devices. [ 61 ] Although PET has poor tensile properties, the performance of a single material in use can be optimized by combining it with other materials through reinforcement, filling, and blending. [ 62 ] For example, Song et al.…”

“…This flexible pressure sensor after 100 torsions still show significant flexibility and good electrical conductivity, after strain release, it immediately restored to the original size, making it suitable for application in a variety of strained conditions in flexible electronic devices. [61] Although PET has poor tensile properties, the performance of a single material in use can be optimized by combining it with other materials through reinforcement, filling, and blending. [62] For example, Song et al fabricated a flexible strain sensor based on a plain carbon nanotube-polydimethylsiloxane (CNT-PDMS) sponge sandwiched between two PET /ITO (indium tin oxide) electrodes, with the PET/ITO being composed of a layer of ITO coating on the PET surface.…”

Influence of Dielectric Loss on RF Performance of Microstrip Multi-Resonant Circuits

“…Nowadays, increasingly flexible materials such as fabrics [1,2], papers [3,4], and plastic films [5] are replacing traditional PCBs, to be used in wearable antennas, resonators, sensors, and so on. As one of the typical circuits within the above applications, the RF performances of U-shaped multiresonator were widely discussed.…”