State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China.
J Colloid Interface Sci. 2021 Feb 1;583:340-350. doi: 10.1016/j.jcis.2020.09.029. Epub 2020 Sep 17.
Chitosan-functionalized mesoporous silica MCM-41 (Chi/M41) was prepared by a mild method. In the composite materials, the spherical MCM-41 particles were regarded as supporting skeletons, which reduced the effect of chitosan swelling on the repeatability and reliability of quartz crystal microbalance (QCM) sensors at high relative humidity (RH), and chitosan provided good film-forming properties of the final composite. The composite structure effectively improved the sensitivity of the QCM sensors compared to that of chitosan and MCM-41 sensors. The QCM sensor based on the Chi/M41 composites showed excellent sensitivity (58.4 ± 0.3 Hz/% RH). In addition, the optimal sensor exhibited excellent reliability, such as negligible humidity hysteresis (0.8 ± 0.1% RH), a small variation coefficient (1.1 ± 0.1), short response and recovery times (18 s/15 s) and good long-term stability. Furthermore, the Langmuir adsorption isotherm model and the Gibbs free energy were used to investigate the adsorption mechanism of water molecules on the sensitive films in this work.
壳聚糖功能化介孔硅 MCM-41（Chi/M41）通过一种温和的方法制备。在复合材料中，球形 MCM-41 颗粒被视为支撑骨架，这减少了壳聚糖在高相对湿度（RH）下对石英晶体微天平（QCM）传感器重复性和可靠性的影响，并且壳聚糖为最终复合材料提供了良好的成膜性能。与壳聚糖和 MCM-41 传感器相比，复合结构有效地提高了 QCM 传感器的灵敏度。基于 Chi/M41 复合材料的 QCM 传感器表现出优异的灵敏度（58.4±0.3 Hz/% RH）。此外，最佳传感器表现出优异的可靠性，例如可以忽略不计的湿度滞后（0.8±0.1% RH）、较小的变化系数（1.1±0.1）、较短的响应和恢复时间（18 s/15 s）以及良好的长期稳定性。此外，本工作还使用 Langmuir 吸附等温线模型和吉布斯自由能来研究水分子在敏感膜上的吸附机制。
