PEDOT:PSS/Natural Rubber Latex Inks for Screen‐Printing Multifunctional Wearable Strain–Humidity Sensors

Abstract

Wearable strain–humidity sensors are increasingly recognized for their role in healthcare and detecting human motion signals. However, many strain–humidity sensors require complex manufacturing processes and have limited applicability. In this study, based on the good miscibility between natural rubber latex (NRL) and poly (3,4‐ethylenedioxythiophene):poly (4‐styrenesulfonate) (PEDOT:PSS), PEDOT:PSS/NRL composite conductors are transferred onto fabric substrate through screen printing and prepared high‐performance strain–humidity sensor. The PEDOT:PSS/NRL blends strain–humidity sensor exhibited good stability and durability (500 cycles) at 10% strain, achieves a gauge factor (GF) of 123.8 with excellent linearity, making it operational in detecting various human motions, such as finger bending, elbow bending, wrist bending, and so on. In addition, the PEDOT:PSS and water molecules interaction results in a humidity response time as low as 0.72 s and recovery time as low as 0.85 s for the PEDOT:PSS/NRL composite strain–humidity sensor, and a wide relative humidity detection range (6–83%), allowing it to be utilized for precise detection of human breathing. Furthermore, it can monitor the use's joint movement, facial muscle movement, and respiratory rate, which show its potential application prospect in health monitoring.

Stretchable, stabilized‐conductive XNBR/PEDOT:PSS composites based on bottom‐deposited structure

“…Under 50% strain, the sensor was repeatedly stretched five times at speeds of 20, 40, and 60 mm/min. Figure 8E shows that it retains excellent stability under different speeds of stretching 59,60 . This proves that the conductive composite can adapt to both fast and slow strain changes in practical applications.…”

“…Figure 8E shows that it retains excellent stability under different speeds of stretching. 59,60 This proves that the conductive composite can adapt to both fast and slow strain changes in practical applications.…”

Printable and flexible integrated sensing systems for wireless healthcare

“…Shao et al employed screen printing to fabricate strain-humidity sensors with natural rubber latex (NRL) and PEDOT:PSS (30 wt%) composite inks. 125 The strain sensor demonstrated reliable performance under 10% strain for 500 cycles, making it applicable for monitoring various body movements. Simultaneously, the humidity sensor displayed a response time of 0.72 seconds and a detection range spanning from 6% to 83%, rendering it suitable for tracking human respiration and respiratory frequency.…”

Silk-based intelligent fibers and textiles: structures, properties, and applications

“…The obtained silk-based composite fibers and fabrics can respond significantly to signals such as strain, stress, temperature, or humidity, and thus can be used as strain, 133–136 temperature, 137–139 and humidity sensors. 137,140,141…”