Gao Xuan-Zhi, Gao Fu-Lin, Liu Ji, Li Yongji, Wan Pengbo, Yu Zhong-Zhen, Li Xiaofeng
Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
ACS Appl Mater Interfaces. 2022 Sep 28;14(38):43783-43791. doi: 10.1021/acsami.2c12892. Epub 2022 Sep 16.
Portable and wearable dual-mode sensors that can simultaneously detect multiple stimuli are essential for emerging artificial intelligence applications, and most efforts are devoted to exploring pressure-sensing devices. It is still challenging to integrate temperature and pressure-sensing functions into one sensor without the requirement for complex decoupling processes. Herein, we develop a self-powered and multifunctional dual-mode sensor by dip-coating melamine sponge with both poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and carboxylated single-walled carbon nanotubes (CNTs). By integrating thermoelectric and conductive PEDOT:PSS/CNT components with the hydrophilic and resilient porous sponge, the resultant sensor is efficient in independently detecting temperature and pressure changes. The temperature and pressure stimuli can be independently converted to voltage and electrical resistance signals on the basis of the Seebeck and piezoresistive effects, respectively. The sensor exhibits a high Seebeck coefficient of 35.9 μV K with a minimum temperature detection limit of 0.4 K and a pressure sensitivity of -3.35% kPa with a minimum pressure detection limit of 4 Pa. Interestingly, the sensor can also be self-powered upon illumination. These multi-functionalities make the sensor a promising tool for applications in electronic skin, soft robots, solar energy conversion, and personal health monitoring.
对于新兴的人工智能应用而言，能够同时检测多种刺激的便携式和可穿戴双模式传感器至关重要，并且大多数研究致力于探索压力传感设备。在无需复杂解耦过程的情况下，将温度和压力传感功能集成到一个传感器中仍然具有挑战性。在此，我们通过用聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）和羧基化单壁碳纳米管（CNT）浸涂三聚氰胺海绵来开发一种自供电的多功能双模式传感器。通过将热电和导电的PEDOT:PSS/CNT组件与亲水性和弹性多孔海绵相结合，所得传感器能够高效地独立检测温度和压力变化。温度和压力刺激可分别基于塞贝克效应和压阻效应独立转换为电压和电阻信号。该传感器具有35.9 μV K的高塞贝克系数，最低温度检测极限为0.4 K，压力灵敏度为-3.35% kPa，最低压力检测极限为4 Pa。有趣的是，该传感器在光照下也能实现自供电。这些多功能特性使该传感器成为电子皮肤、软体机器人、太阳能转换和个人健康监测等应用中有前景的工具。
