Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi, 214122, PR China; Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Jinan, 250353, China.
College of Light Industry and Food Science, Nanjing Forestry University, Nanjing, 210037, China.
Carbohydr Polym. 2020 Jul 15;240:116281. doi: 10.1016/j.carbpol.2020.116281. Epub 2020 Apr 17.
Herein, we fabricated flexible and humidity-sensitive composite films employing cellulose nanocrystal (CNC) and polyols, i.e., glycerol (G), xylitol (X) and sorbitol (S). The effects of polyols with different molecular weights on the structure, optical properties, mechanical strength and humidity response of the composite films were investigated. Notably, the CNC-S film exhibited obvious reversible colour changes from light green to red upon a relative humidity (RH) change from 30 % to 95 %. Moreover, it was found that the composite films had a large colour-change range, good reversibility (>10 cycles), and excellent stability (>10 weeks). Overall, the results demonstrated that the CNC-S composite film can be used as a functional material for the preparation of flexible humidity sensors for the detection of environmental humidity changes in agriculture, industry, and other fields.
在此，我们采用纤维素纳米晶体（CNC）和多元醇，即甘油（G）、木糖醇（X）和山梨糖醇（S），制备了柔性和湿度敏感的复合薄膜。研究了不同分子量多元醇对复合薄膜结构、光学性能、力学强度和湿度响应的影响。值得注意的是，CNC-S 薄膜在相对湿度（RH）从 30%变化到 95%时，颜色从浅绿变为红色，表现出明显的可逆颜色变化。此外，研究发现复合薄膜具有较大的颜色变化范围、良好的可逆性（>10 个循环）和优异的稳定性（>10 周）。总的来说，结果表明，CNC-S 复合薄膜可用作制备柔性湿度传感器的功能材料，用于检测农业、工业等领域的环境湿度变化。
