Self-assembled graphene oxide/polyethyleneimine films as high-performance quartz crystal microbalance humidity sensors

• 作者: Zhen Yuan Hui-Ling Tai Yuan-Jie Su Guang-Zhong Xie Xiao-Song Du Ya-Dong Jiang
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ADVANCED NANOMATERIALS FOR GAS AND HUMIDITY SENSORS
• 页码范围: 1597-1603
• 页数: 7页
• 语种: 英文

摘要

As humidity is one of the most widely demanded environmental parameters,the precision of its detection is significant.An advanced humidity sensor will improve the validity of the humidity monitoring system.In this study,a facile chemical layer-by-layer self-assembly (CLS) method was developed for fabricating graphene oxide (GO)/poly-ethyleneimine (PEI) multilayer films.Owing to the chem-ical bonding between the PEI and GO,and the intrinsic stickiness of the PEI,layered films with different numbers of layers were successfully prepared using the CLS method and confirmed through ultraviolet-visible (UV-Vis) spec-troscopy and the mass loading of quartz crystal microbal-ance (QCM).Morphological measurements revealed that the roughness and thickness of the films increased expo-nentially with the number of bilayers.The GO/PEI films were deposited on QCM electrodes using the CLS method to produce the humidity sensors.The humidity measure-ment results showed a high sensitivity (37.84 Hz/％RH)and rapid response/recovery (＜ 5 s/8 s) of the optimal sensor,which was superior to that of recently developed QCM sensors.