High-precision, stretchable kirigami-capacitive sensor with ultra-low cross-sensitivity for body temperature monitoring

Yu, Yuyan; Peng, Shuhua; Sha, Zuoliang; Cheng, Xinying; Wu, Shuying; Wang, Chun H.

doi:10.1039/d1ta06978k

Cited by 25 publications

(26 citation statements)

References 56 publications

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“…The stiffness (or softness) of conductive nanocomposites can be designed to match human skin or other biological tissues, enabling the sensors to be comfortably worn directly on skin for accurate real-time monitoring of body temperature. By designing the material combination and sensors’ geometry, the detection limits and thermal conductivity can be engineered to provide precise and accurate monitoring of body temperature …”

Section: Applicationsmentioning

confidence: 99%

“…By designing the material combination and sensors' geometry, the detection limits and thermal conductivity can be engineered to provide precise and accurate monitoring of body temperature. 141 Although the electrical conductivity of stretchable conductive nanocomposites is intrinsically sensitive to temperature, their temperature sensitivity is typically low. By controlling the microcrack density and geometry in conductive nanocomposites, the temperature sensitivity of wearable sensors, which is given by k T = ΔR/(R 0 ΔT), can be enhanced significantly.…”

Section: Applicationsmentioning

confidence: 99%

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Conductive Polymer Nanocomposites for Stretchable Electronics: Material Selection, Design, and Applications

Peng

et al. 2021

ACS Appl. Mater. Interfaces

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111

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Stretchable electronics that can elongate elastically as well as flex are crucial to a wide range of emerging technologies, such as wearable medical devices, electronic skin, and soft robotics. Critical to stretchable electronics is their ability to withstand large mechanical strain without failure while retaining their electrical conduction properties, a feat significantly beyond traditional metals and silicon-based semiconductors. Herein, we present a review of the recent advances in stretchable conductive polymer nanocomposites with exceptional stretchability and electrical properties, which have the potential to transform a wide range of applications, including wearable sensors for biophysical signals, stretchable conductors and electrodes, and deformable energy-harvesting and -storage devices. Critical to achieving these stretching properties are the judicious selection and hybridization of nanomaterials, novel microstructure designs, and facile fabrication processes, which are the focus of this Review. To highlight the potentials of conductive nanocomposites, a summary of some recent important applications is presented, including COVID-19 remote monitoring, connected health, electronic skin for augmented intelligence, and soft robotics. Finally, perspectives on future challenges and new research opportunities are also presented and discussed.

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Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Conductive Polymer Nanocomposites for Stretchable Electronics: Material Selection, Design, and Applications

Peng

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

111

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“…From Figure d, the Δ C / C 0 value of the sensor is stepwise increased as the temperature is stepwise increased by 0.02 °C and then approaches a platform when the temperature is fixed at a constant. The monitoring accuracy of our sensor is as low as 0.02 °C, which is more accurate than all previously reported temperature sensors. ,,− ,− …”

Section: Resultsmentioning

confidence: 55%

“…It is found that the sensor temperature sensitivity is ca. 25.99% °C –1 , which is higher than those of previous capacitive temperature sensors or resistance temperature sensors. − A cyclic heating–cooling test of this sensor within 30–40 °C is implemented as described in Figure b. It is observed that the Δ C / C 0 value of the sensor is increased with increasing temperature and then is decreased instantly with decreasing temperature.…”

Section: Resultsmentioning

confidence: 95%

Multifunctional Iontronic Sensor Based on Liquid Metal-Filled Ho llow Ionogel Fibers in Detecting Pressure, Temperature, and Proximity

Chen

Zhu

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Fiber-based pressure/temperature sensors are highly desired in wearable electronics because of their natural advantages of good breathability and easy integrability. However, it is still a great challenge to fabricate reliable and highly sensitive fiber-based pressure/temperature sensors via a scalable and facile strategy. Herein, a novel fiber-based iontronic sensor with excellent pressure-and temperature-sensing capabilities is designed by assembling two crossed hollow and porous ionogel fibers filled with liquid metal. Serving as a pressure sensor, a high detection resolution (1.16 Pa), a high sensitivity of 13.30 kPa −1 (0−2 kPa), and a wide detection range (∼207 kPa) are realized owing to its novel hierarchical structure and the selection of deformable liquid electrodes. As a temperature sensor, it exhibits a high temperature sensitivity of 25.99% °C−1 (35−40 °C), high resolution of 0.02 °C, and good repeatability and reliability. On the basis of these excellent sensing capabilities, the as-prepared sensor can detect not only pressure signals varied from weak pulse to large joint movements but also the proximity of different objects. Furthermore, a large-area fiber array can be easily woven for acquiring the pressure mapping to intuitively distinguish the location, magnitude, and shape of the loaded object. This work provides a universal strategy to design fiber-shaped iontronic sensors for wearable electronics.

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“…[ 40 ] However, the TPU‐based capacitive sensor still shows high sensitivity to pressure even though its pressure sensitivity was relatively small at 0.038 kPa −1 . [ 41,42 ] The temperature resolution of the sensor degraded to 5.4 °C when the sensor was subjected to pressure as low as 1 kPa, [ 40 ] which is much lower than the pressure (2.7–4.0 kPa) employed by typical medical compression garments. [ 43 ]…”

Section: Introductionmentioning

confidence: 99%

Wearable Supercapacitive Temperature Sensors with High Accuracy Based on Ionically Conductive Organogel and Macro‐Kirigami Electrode

Peng

Islam

et al. 2022

Adv Materials Technologies

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Wearable temperature sensors with high accuracy are critical for human health monitoring. Ideally, they should show accuracy matching that of medical‐grade thermometers (i.e., ± ≈0.1–0.2 °C). Achieving this goal has proven challenging for sensors that must also meet key wearable requirements, such as flexibility, stretchability, and breathability. Herein, a new stretchable supercapacitive temperature sensor with a resolution of ±0.2 °C, is presented, which was achieved by. Two new strategies to increase temperature sensitivity and minimize the interferences of mechanical stretching and pressure: a) synthesizing an ion‐conductive NaCl‐organogel to serve as the redox‐active separator to increase sensitivity and suppress interference of compression; and b) using a kirigami design to decrease the interference of stretch and improve breathability. These two novel strategies endow the supercapacitive temperature sensors with a temperature accuracy of ±0.2 °C and exceptionally high sensitivity of 0.095 °C−1, which is more than 13 times higher than traditional dielectric‐capacitive sensors. The potential of the supercapacitive sensor in measuring body temperature is demonstrated by continuously monitoring skin temperatures under a medical compression garment that exerts pressure on the skin and the unsteady wrist flexion. The findings confirm that the organogel‐based supercapacitive sensors offer an extraordinary temperature accuracy significantly better than wearable sensors reported in the literature. The combined characteristics of high resolution, linearity, breathability, and stretchability make this sensor a promising candidate for skin‐interfaced health monitoring devices.

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High-precision, stretchable kirigami-capacitive sensor with ultra-low cross-sensitivity for body temperature monitoring

Abstract: Wearable temperature sensors meeting the resolution of medical-grade thermometers are needed to continuously monitor skin temperature variations indicative of diseases and sports performance. Herein, we present a new technique for...

Cited by 25 publications

References 56 publications

Conductive Polymer Nanocomposites for Stretchable Electronics: Material Selection, Design, and Applications

Conductive Polymer Nanocomposites for Stretchable Electronics: Material Selection, Design, and Applications

Multifunctional Iontronic Sensor Based on Liquid Metal-Filled Ho llow Ionogel Fibers in Detecting Pressure, Temperature, and Proximity

Wearable Supercapacitive Temperature Sensors with High Accuracy Based on Ionically Conductive Organogel and Macro‐Kirigami Electrode

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