纤维素纳米晶体用于环境友好的自组装激励掺杂多传感光子学材料《ACS Applied Polymer Materials》

纤维素纳米晶体用于环境友好的自组装激励掺杂多传感光子学材料

摘要

纤维素及其衍生物等材料正吸引着全世界越来越多的关注，以认识到它们在应对日益复杂的技术要求方面的潜力。通过使用自组装技术，可以通过可控功能来满足对多功能材料日益增长的需求。基于纤维素的光子刺激响应材料在响应外部输入时可以可逆地改变颜色。纤维素纳米晶体（CNCs）是一种可生物更新的材料，可自组装成具有彩虹色的手性向列有序结构。由于结构着色机制，CNC在响应环境刺激时显示出独特的光学特征。本文综述了基于CNC的多传感光子结构对外部掺杂的响应。在CNC前体中加入功能性聚合物、小分子或其他光学活性成分，可以增强和稳定其均匀性，从而更好地刺激与CNC的相互作用。本文综述了纤维素基纳米材料在智能纺织品、智能包装、安全编码、光子纸、湿度传感器等领域的多种应用中，是设计先进功能光子学材料的潜在候选材料，但仍有一些局限性需要克服。

关键词：纤维素纳米晶体、结构颜色、光子学、刺激响应、自组装

Cellulose Nanocrystals for Environment-Friendly Self-Assembled Stimuli Doped Multisensing Photonics

REVIEW

Chhavi Verma, Monika Chhajed, Shiva Singh, and Pradip K. Maji*

Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur - 247001, Uttar Pradesh, India

ACS Appl. Polym. Mater. 2022, 4, 6, 4047–4068

ABSTRACT

Materials such as cellulose and its derivatives are attracting growing attention worldwide to recognize their potential in responding to increasingly complex technological requirements. The rising demand for multifunctional materials may be fulfilled with controllable functionalities by using self-assembling techniques. Photonic stimuli-responsive materials based on cellulose can shift color reversibly when responding to external inputs. Cellulose nanocrystals (CNCs) are biorenewable materials that self-assemble themselves into a chiral nematic ordering exhibiting iridescent colors. The CNCs display unique optical features in response to environmental stimuli due to the structural coloration mechanism. This review summarizes the CNC-based multisensing photonic structures in response to external dopants. The inclusion of functional polymers, small molecules, or other optically active components into CNC precursors can enhance and stabilize their uniformity, allowing better stimuli interaction with the CNCs. This review reveals that cellulose-based nanomaterials are a potential candidate for designing advanced functional photonics materials in diverse applications for smart textiles, intelligent packaging, security coding, photonic papers, humidity sensors, etc., with some limitations to overcome.

KEYWORDS: cellulose nanocrystals, structural color, photonics, stimuli-responsive, self-assembly

来源：《ACS Applied Polymer Materials》

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