A chitosan/amido‐graphene oxide‐based self‐powered humidity sensor enabled by triboelectric effect
Bohao Liu, Guangzhong Xie, Cheng-Zhen Li, Si Wang, Zhen Yuan, Zaihua Duan, Yadong Jiang, Huiling Tai
Abstract
Abstract In this work, amido‐graphene oxide (GO‐NH 2 ) loaded chitosan (CTS) composite material (CTS/GO‐NH 2 ) that acts as both the triboelectric and sensing film was prepared on rotary fan‐shaped triboelectric nanogenerator for humidity detection. Compared with the pristine CTS‐based triboelectric humidity sensor (CTS‐THS) and GO‐NH 2 ‐THS, the CTS/GO‐NH 2 ‐based humidity sensor exhibited higher humidity response and better linearity in the relative humidity (RH) range of 18.7%RH–91.5%RH. The above results can be explained by the massive exposed and less concealed hydrophilic functional groups of CTS with the help of the wrinkle structure of GO‐NH 2 . Meanwhile, the CTS/GO‐NH 2 ‐THS possessed good repeatability and acceptable hysteresis (~ 6.2%RH). Finally, a humidity sensing mechanism coupling triboelectric contact charging effect with electrons transfer principle under moisture environment was established to interpret the enhanced humidity sensing performance of the composite film‐based THS. This work demonstrates that CTS/GO‐NH 2 composite film can be utilized to fabricate humidity sensors based on the triboelectric effect.