Flexible temperature-pressure dual sensor based on 3D spiral thermoelectric Bi<sub>2</sub>Te<sub>3</sub> films.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38514626.
- Also identified by DOI 10.1038/s41467-024-46836-1 and PMC identifier 10958038.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Dual-parameter pressure-temperature sensors are widely employed in personal health monitoring and robots to detect external signals. Herein, we develop a flexible composite dual-parameter pressure-temperature sensor based on three-dimensional (3D) spiral thermoelectric Bi<sub>2</sub>Te<sub>3</sub> films. The film has a (000l) texture and good flexibility, exhibiting a maximum Seebeck coefficient of -181 μV K<sup>-1</sup> and piezoresistance gauge factor of approximately -9.2. The device demonstrates a record-high temperature-sensing performance with a high sensing sensitivity (-426.4 μV K<sup>-1</sup>) and rapid response time (~0.95 s), which are better than those observed in most previous studies. In addition, owing to the piezoresistive effect in the Bi<sub>2</sub>Te<sub>3</sub> film, the 3D-spiral deviceexhibits significant pressure-response properties with a pressure-sensing sensitivity of 120 Pa<sup>-1</sup>. This innovative approach achieves high-performance dual-parameter sensing using one kind of material with high flexibility, providing insight into the design and fabrication of many applications, such as e-skin.