Wearable Temperature Sensor with High Resolution for Skin Temperature Monitoring

Abstract

Flexible temperature sensors with high resolution and good reliability under deformation are a major research focus for wearable electronic devices for skin temperature monitoring. In this study, a fiber-like temperature sensor is fabricated by in situ growing poly­(3,4-ethylenedioxythiophene) (PEDOT) on the surface of thermoplastic polyurethane (TPU) fiber. The temperature sensor achieves a high sensitivity of 0.95%·°C–1 with a high linearity between 20 and 40 °C. Most importantly, the sensor achieves a high temperature resolution of 0.2 °C. Due to its structure, the temperature-sensitive fiber is easily embedded into textiles. By sewing the fiber into normal textiles in an S-shape, the interference of strain can be nearly avoided, even when the textile is stretched to 140%. Also, the obtained sensors can monitor skin temperature during exercise, which demonstrates the potential of the sensor’s application in healthcare and disease diagnosis.

Tetra-Nuclear Cluster-Based Lanthanide Metal–Organic Frameworks as White Phosphor, Information Encryption, Self-Calibrating Thermometers, and Fe2+ Sensors

“…The self-calibration ratio is I Eu / I Tb at 610 nm (Eu 3+ ) and 540 nm (Tb 3+ ). The luminescence intensity is temperature-dependent (Figure a), and it satisfies the equation of Y = 1.91523 × 10 –4 exp (0.03096 x ) + 0.19482, with R 2 = 0.99186 (Figure b), indicating that Tb,EuMOF is a self-calibrated luminescent thermometer within a long temperature range of 110–300 K, which is rarely reported …”

“…The luminescence intensity is temperature-dependent (Figure 5a), and it satisfies the equation of Y = 1.91523 × 10 −4 exp (0.03096x) + 0.19482, with R 2 = 0.99186 (Figure 5b), 15 indicating that Tb,EuMOF is a self-calibrated luminescent thermometer within a long temperature range of 110−300 K, 62 which is rarely reported. 63 The relative sensitivity (Sr) is usually used to quantitatively compare various thermometers. As shown in Figure 5c, the Sr increases linearly and sharply from 0.15476 to 2.28117 with temperature, reaching its maximum value at 300 K, which is 1.77 times higher than ZJU-88 ⊃ perylene and much higher than 1.19%/K of Tb 0.8 Eu 0.2 -BPDA.…”

A one-pot approach to prepare stretchable and conductive regenerated silk fibroin/CNT films as multifunctional sensors

“…The obtained TCR value (1.644% °C −1 ) surpassed that of the recently reported carbon nanotube-based flexible thermistors. 20,52,58–63 A comparison of the TCR of the SF/GL/CNT sensor with those of the recent reports is listed in Table S3 †…”

“…The obtained TCR value (1.644% °C−1 ) surpassed that of the recently reported carbon nanotube-based flexible thermistors. 20,52,[58][59][60][61][62][63] A comparison of the TCR of the SF/GL/ CNT sensor with those of the recent reports is listed in Table S3. † Additionally, the nonlinear temperature dependency resistances can be expressed using the following growth exponential:…”

Laser-scribed graphene for sensors: preparation, modification, applications, and future prospects

“…Real-time monitoring of body temperature is important for assessing the quality of various vital activities in the human body. Wearable temperature sensors with good flexibility and ductility can fit on the skin surface to ensure real-time, accurate, and comfortable body temperature monitoring, and have thus attracted wide interest 137 .…”