Bioinspired Dual‐Mode Stretchable Strain Sensor Based on Magnetic Nanocomposites for Strain/Magnetic Discrimination

Abstract

Recently, flexible stretchable sensors have been gaining attention for their excellent adaptability for electronic skin applications. However, the preparation of stretchable strain sensors that achieve dual‐mode sensing while still retaining ultra‐low detection limit of strain, high sensitivity, and low cost is a pressing task. Herein, a high‐performance dual‐mode stretchable strain sensor (DMSSS) based on biomimetic scorpion foot slit microstructures and multi‐walled carbon nanotubes (MWCNTs)/graphene (GR)/silicone rubber (SR)/Fe3O4 nanocomposites is proposed, which can accurately sense strain and magnetic stimuli. The DMSSS exhibits a large strain detection range (≈160%), sensitivity up to 100.56 (130–160%), an ultra‐low detection limit of strain (0.16% strain), and superior durability (9000 cycles of stretch/release). The sensor can accurately recognize sign language movement, as well as realize object proximity information perception and whole process information monitoring. Furthermore, human joint movements and micro‐expressions can be monitored in real‐time. Therefore, the DMSSS of this work opens up promising prospects for applications in sign language pose recognition, non‐contact sensing, human‐computer interaction, and electronic skin.

MXene Ti3C2Tx, EGaIn, and Carbon Nanotube Composites on Polyurethane Substrates for Strain Sensing, Electromagnetic Interference Shielding, and Joule Heating

“…Additionally, current research on multifunctionality is yet to achieve the optimization of all performance aspects. Specifically, studies focused on strain sensing still struggle to achieve both high sensitivity and a wide sensing range simultaneously. , …”

“…Specifically, studies focused on strain sensing still struggle to achieve both high sensitivity and a wide sensing range simultaneously. 18,19 The design and coordination of multidimensional conductive materials play a pivotal role in sensor components. For instance, zero-dimensional nanoparticles like metal nanoparticles 20,21 can be incorporated into an elastic substrate to form a conductive percolation network, leading to significant resistance changes under deformation.…”

Capacitive Sensors with Hybrid Dielectric Structures and High Sensitivity over a Wide Pressure Range for Monitoring Biosignals

“…With the development of advanced IoT technology, intelligent medical sensors which can realize the monitoring of various biosignals are increasingly vital for the early diagnosis or prevention of disease. Flexible pressure sensors have come into the limelight due to their broad application prospects in electronic skin, health monitoring, human–machine interfaces, and IoTs. − Many extensive efforts have been devoted to develop high-performance flexible pressure sensors based on different transmission mechanisms, such as piezoresistive, − piezoelectric, , capacitive, − and triboelectric sensors. , Among these varied types of sensors, capacitive pressure sensors (CPSs) are more appealing due to the advantages of the simple structure, rapid response, uncomplicated signal acquisition, easy large-area fabrication, low energy consumption, and so forth . To meet the need of multifunctional application scenarios, a lot of efforts have been made to develop flexible CPSs with high sensitivity, low detection limit, superior stability, good linearity, and broad range. − According to the formula C = ε 0 ε r A / d , causing a change in capacitance ( C ) can be realized by changing the relative permittivity of the dielectric (ε r ), the interval between two electrodes ( d ), or their relative area ( A ).…”

Structural Modification in Au-MoS2 Quantum Dot Composites for Improved Catalytic Efficiency in p-Nitrophenol Reduction

“…Inorganic semiconductors decorated with AuNPs have improved conductivity and catalytic activity in recent years, facilitating the development of highly sensitive biosensors. The exciting characteristics of these materials include their electrical and optical elements, which result from the exciton plasmon coupling and the limited number of heterojunctions. , In order to form a chemical link with gold nanoparticles, other nanocomposites, such as carbon derivatives, need diverse functionalization . However, layered transition-metal dichalcogenides, such as MoS 2 and WS 2 , which include sulfur atoms over the outer layer, are considerably better suited for metal–ligand complex formation or the creation of potent Au–S bonds.…”