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

• DOI: 10.1002/adfm.202300092
• Publication Date: 2023-04-25T13:30:15Z
• Authors: Chaebeen Kwon; Sanghyeon Lee; Chihyeong Won; Kyu Hyoung Lee; Minyoung Kim; Jaehong Lee; Seung‐Jae Yang; Minkyu Lee; Seungmin Lee; Kukro Yoon; Sungjoon Cho; Taeyoon Lee
• Keywords: Bismuth telluride; Bismuth; Flexible Electronics

Abstract Fiber‐based electronics are essential components for human‐friendly wearable devices due to their flexibility, stretchability, and wearing comfort. Many thermoelectric (TE) fabrics investigated with diverse materials manufacturing methods meet these potential demands. Despite such advancements, applying inorganic TE stretchable platforms remains challenging, constraining broad adoption in electronics. Herein, a multi‐functional bismuth telluride (Bi 2 Te 3 ) fabric is fabricated by situ reduction optimize the formation of Bi nanoparticles (NPs) inside outside cotton fabric. Due high durability NP networks, exhibits excellent electrical reliability under 10,000 cycles both stretching compression. Interestingly, intrinsic negative piezoresistance NPs lateral strain found, which caused band gap change. Furthermore, unit achieves power factor 25.77 µWm −1 K −2 conductivity 36.7 Scm Seebeck coefficient −83.79 µVK at room temperature. The applied system that can detect normal pressure temperature difference. Balance weight finger put on top × assembly differentiated through sensing real time.