Yao Yao, Huang Xianhe, Chen Qiao, Zhang Zhen, Ling Weiwei
School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
SCNU-TUE Joint Lab of Device Integrated Responsive Materials (DIRM), South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
Nanomaterials (Basel). 2020 Nov 5;10(11):2210. doi: 10.3390/nano10112210.
In this paper, a high sensitivity and high stability quartz crystal microbalance (QCM) humidity sensor using polydopamine (PDA) coated cellulose nanocrystal (CNC)/graphene oxide (GO) (PDA@CNC/GO) nanocomposite as sensitive material is demonstrated. The PDA@CNC was prepared by the self-polymerization action on the surface of CNC, and it acted as filler material to form functional nanocomposite with GO. The material characteristics of PDA@CNC, CNC/GO and PDA@CNC/GO were analyzed by transmission electron microscope (TEM) and Fourier transform infrared spectroscopy (FTIR), respectively. The experimental results show that the introduction of PDA@CNC into GO film not only effectively enhanced the sensitivity of GO-based nanocomposite-coated QCM sensor but also significantly maintained high stability in the entire humidity range. The PDA@CNC/GO30-coated QCM humidity sensor exhibited a superior response sensitivity up to 54.66 Hz/% relative humidity (RH), while the change rate of dynamic resistance of the sensor in the humidity range of 11.3-97.3% RH is only 14% that is much smaller than that of CNC/GO-coated QCM. Besides, the effect of the PDA@CNC content on the sensitivity and stability of GO-based nanocomposite-coated QCM humidity was also studied. Moreover, other performances of PDA@CNC/GO-coated QCM humidity sensor, including humidity hysteresis, fast response and recovery and long-term stability, were systematically investigated. This work suggests that PDA@CNC/GO nanocomposite is a promising candidate material for realizing high sensitivity and high stability QCM humidity sensor in the entire humidity detection range.
本文展示了一种使用聚多巴胺（PDA）包覆的纤维素纳米晶体（CNC）/氧化石墨烯（GO）（PDA@CNC/GO）纳米复合材料作为敏感材料的高灵敏度和高稳定性石英晶体微天平（QCM）湿度传感器。PDA@CNC是通过在CNC表面的自聚合作用制备的，它作为填充材料与GO形成功能纳米复合材料。分别通过透射电子显微镜（TEM）和傅里叶变换红外光谱（FTIR）对PDA@CNC、CNC/GO和PDA@CNC/GO的材料特性进行了分析。实验结果表明，将PDA@CNC引入GO薄膜不仅有效提高了基于GO的纳米复合材料包覆的QCM传感器的灵敏度，而且在整个湿度范围内显著保持了高稳定性。PDA@CNC/GO30包覆的QCM湿度传感器表现出高达54.66 Hz/%相对湿度（RH）的优异响应灵敏度，而该传感器在11.3 - 97.3% RH湿度范围内的动态电阻变化率仅为14%，远小于CNC/GO包覆的QCM。此外，还研究了PDA@CNC含量对基于GO的纳米复合材料包覆的QCM湿度传感器灵敏度和稳定性的影响。此外，还系统研究了PDA@CNC/GO包覆的QCM湿度传感器的其他性能，包括湿度滞后、快速响应和恢复以及长期稳定性。这项工作表明，PDA@CNC/GO纳米复合材料是在整个湿度检测范围内实现高灵敏度和高稳定性QCM湿度传感器的有前途的候选材料。
