Bioinspired sandwich-structured pressure sensors based on graphene oxide/hydroxyl functionalized carbon nanotubes/bovine serum albumin nanocomposites for wearable textile electronics

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 ).…”

Dual-Mode Fiber Strain Sensor Based on Mechanochromic Photonic Crystal and Transparent Conductive Elastomer for Human Motion Detection

“…At present, various optical materials for visualized strain sensing have been developed, such as organic light-emitting diodes, inorganic phosphors, organic chromophores, photonic crystals, etc . Among these materials, mechanochromic photonic crystals are considered to be one of the most promising candidates, mainly because they can produce an immediate and intuitive dynamic color response without consuming any energy. − Benefiting from their large stretchability and excellent optical performance, photonic crystal-based strain sensors have been used for visual monitoring of human motion with large strain. ,− On the other hand, the strain-related electrical signal can be used as an effective indicator to quantify the deformation. , In particular, the electronic strain sensors with high sensitivity have been widely explored in monitoring human motion with small strain. , By combining mechanochromic photonic crystals with high sensitivity electronic strain sensors, some interactive wearable devices with optical/electrical dual-signal outputs have been realized, ,− which can be used to monitor human motion ranging from human physiological movements (e.g., breathing and swallowing) with tiny deformation to human joint movements (e.g., bending of finger and elbow) with large strain. − …”

Ultrasensitive Humidity Sensors with Synergy between Superhydrophilic Porous Carbon Electrodes and Phosphorus-Doped Dielectric Electrolyte

“…Recently, wearable medical-care devices have attracted tremendous attention to meet the urgent demands of human health monitoring. − As a key component, humidity sensors could detect water molecules released from human body, which helps to reflect human physical condition such as respiration patterns, skin condition, wounded healing, sports pattern, etc. − To pursue an outstanding performance, enormous efforts have been put forth to realize an ultrahigh sensitivity and a quick response time. − Meanwhile, other properties, e.g., signal stability and mechanical flexibility, are also widely concerned in wearable humidity sensors.…”