【ACS AMI】Polyimide-Sputtered and Polymerized Films with Ultrahigh Moisture Sensitivity for Respiratory Monitoring and Contactless Sensing
作者：Nan Wang, Jianhao Tong, Junjie Wang, Qi Wang, Shangbi Chen, and Bin Sheng*
關鍵字：polyimide, sputtering deposition, capacitive humidity sensors, respiratory monitoring, contactless sensing
論文來源：期刊
具體來源：ACS Appl. Mater. Interfaces, https://doi.org/10.1021/acsami.1c24833
發表時間：2022年
Respiratory monitoring and contactless sensing using the moisture produced by respiration and perspiration have garnered considerable attention in recent years. In this study, we fabricated polyimide-sputtered and polymerized (PSP) humidity sensors with ultrahigh capacitive sensitivity, fast response, and a wide working range of relative humidity (RH). The sensors produced >40000 times increment in the sensing signal over the 10–95% RH range at 10 Hz and exhibited good performance at low RH levels (<40%) as well. These sensors displayed excellent sensing properties with small hysteresis, long-time stability, and fast response and recovery times (2.4 and 1.2 s, respectively). In the mechanism study of PSP humidity sensors, we found that the high sensitivity can be attributed to massive hydrophilic functional groups formed on the polymer chains by moist aging with oxidation and the fast response speed is due to the mesoporous structure of PSP films. We also fabricated a 5 × 5 array of PSP humidity sensors to identify the shapes of wet objects and of leaves during transpiration. Thus, we reported a novel and effective method for fabricating high-performance humidity polymer films, channeling new pathways for the development of advanced humidity and gas sensors.
論文鏈接：https://doi.org/10.1021/acsami.1c24833