Flexible Photonic Cellulose Nanocrystal Films as a Platform with Multisensing Functions
Flexible Photonic Cellulose Nanocrystal Films as a Platform with Multisensing Functions
复制标题
柔性光子纤维素纳米晶体薄膜作为具有多传感功能的平台
DOI：
10.1021/acssuschemeng.0c06174
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发表时间：
2020-12-21
影响因子：
8.4
通讯作者：
Wang, Yu-zhong
中科院分区：
文献类型：
--
作者：
Bai, Lan;Wang, Zi-li;Wang, Yu-zhong
仿生光学纤维纳米晶材料因其简单的肉眼识别能力，在比色传感、防伪、装饰涂层等方面显示出巨大的应用潜力，但如何同时解决其固有的脆性，同时实现多传感功能仍是一个巨大的挑战。在这里，我们提出了一种新的碳纳米管与柠檬酸(CA)共组装的策略来制备独立的光子数控薄膜。通过改变CA的含量，可以在较宽的颜色范围内调节手性向列相结构和可见结构颜色。由于具有塑化作用，所制得的NC-CA膜具有很高的柔韧性，可以自由折叠。值得注意的是，这类薄膜可以通过改变外观结构颜色来感知不同的外部信号，包括压缩、乙醇和碱。此外，对于挥发性化学物质，颜色变化是可逆的，确保重复使用。该方法具有较高的机械性能和多传感性能，是构建高柔性多功能光子数控材料的一种简单而有效的方法。
Biomimetic optical cellulose nanocrystal (CNC) materials have shown great potential for application in colorimetric sensing, anticounterfeiting, and decorative coatings because of simple recognition by the naked eye; however, how to simultaneously solve the inherent brittleness of CNCs as well as achieve multisensing functions is still a big challenge. Here, we propose a new coassembly strategy of CNCs and citric acid (CA) to fabricate freestanding photonic CNC films. The chiral nematic structure and visible structural colors can be adjusted in a wide color range by varying the CA content. Owing to the plasticizing effect, the resulting CNC-CA films display high flexibility and can be folded freely. Notably, such films can sense different external signals, including compression, ethanol and alkali, by changing apparent structural colors. Additionally, for volatile chemicals, the color changes are reversible, ensuring repeating applications. Given the high mechanical performance and multisensing performance, this method represents a simple but effective way to construct highly flexible and multifunctional photonic CNC materials.