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Multi-Functional and Stretchable Thermoelectric Bi2Te3 Fabric for Strain, Pressure, and Temperature-Sensing

Multi-Functional and Stretchable Thermoelectric Bi2Te3 Fabric for Strain, Pressure, and Temperature-Sensing
Kwon, ChaebeenLee, SanghyeonWon, ChihyeongLee, Kyu HyoungKim, MinyoungLee, JaehongYang, Seung-JaeLee, MinkyuLee, SeungminYoon, KukroCho, SungjoonLee, Taeyoon
Issued Date
Advanced Functional Materials, v.33, no.26
Author Keywords
bismuth telluride(Bi 2Te 3)negative gauge factorpressure sensorsstrain sensorstemperature sensorsthermoelectric fabricswearable electronics
Fiber-based electronics are essential components for human-friendly wearable devices due to their flexibility, stretchability, and wearing comfort. Many thermoelectric (TE) fabrics are investigated with diverse materials and manufacturing methods to meet these potential demands. Despite such advancements, applying inorganic TE materials to stretchable platforms remains challenging, constraining their broad adoption in wearable electronics. Herein, a multi-functional and stretchable bismuth telluride (Bi2Te3) TE fabric is fabricated by in situ reduction to optimize the formation of Bi2Te3 nanoparticles (NPs) inside and outside of cotton fabric. Due to the high durability of Bi2Te3 NP networks, the Bi2Te3 TE fabric exhibits excellent electrical reliability under 10,000 cycles of both stretching and compression. Interestingly, intrinsic negative piezoresistance of Bi2Te3 NPs under lateral strain is found, which is caused by the band gap change. Furthermore, the TE unit achieves a power factor of 25.77 µWm−1K−2 with electrical conductivity of 36.7 Scm−1 and a Seebeck coefficient of −83.79 µVK−1 at room temperature. The Bi2Te3 TE fabric is applied to a system that can detect both normal pressure and temperature difference. Balance weight and a finger put on top of the 3 × 3 Bi2Te3 fabric assembly are differentiated through the sensing system in real time. © 2023 Wiley-VCH GmbH.
John Wiley & Sons Ltd.
Related Researcher
  • 이재홍 Lee, Jaehong 로봇및기계전자공학과
  • Research Interests Fiber electronics; wearable electronics; soft electronics; conductive fiber; implantable devices; electronic sutures
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Department of Robotics and Mechatronics Engineering Soft Biomedical Devices Lab 1. Journal Articles


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