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| Cellulose Nanocrystal Photonic Films: Fabrication and Stimuli-responsive Properties |
| Received:June 18, 2025 Revised:July 10, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.11.001 |
| Key Words:cellulose nanocrystals photonic structure color deep eutectic solvents reversible humidity performance |
| Fund Project:博士后科学基金资助项目（2024M760380）；浙江省博士后科研项目（ZJ2024113）；浙江省教育厅一般科研项目（Y202351793）；浙江科技学院青年科学基金项目（2023QN052）；浙江科技大学环境与资源学院青年教师创新研究项目（HZQY202408）。 |
| Author Name | Affiliation | Postcode | | MENG Yahui* | College of Materials Science and Engineering, Northeast Forestry University, Haerbin, Heilongjiang Province, 150006
School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023
Zhejiang Jingxing Paper Industry Co., Ltd., Jiaxing, Zhejiang Province, 314214 | 314214 | | JIA Zhixin* | College of Materials Science and Engineering, Northeast Forestry University, Haerbin, Heilongjiang Province, 150006
School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | GUO Daliang | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | ZHAO Huifang | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | SHA Lizheng | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | SHEN Jing* | College of Materials Science and Engineering, Northeast Forestry University, Haerbin, Heilongjiang Province, 150006 | 150006 |
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| Abstract:In this study， a photonic film with both mechanical properties and tunable structural color was prepared by incorporating deep eutectic solvents (DES) into cellulose nanocrystals (CNC) through layered casting，and it was named CNC/DES photonic film. The results showed that the amount of DES added was a crucial parameter for regulating the structural color， mechanical properties， thermal stability， and responsive characteristics of photonic films. The introduction of DES effectively addressed the defect of insufficient flexibility in photonic films， increasing the elongation at break to （0.74±0.18）%. The film exhibited a wide color gamut (gradually transitioning from blue to orange-red) and enhanced thermal stability. The CNC/DES0.5 photonic film （the addition amount of DES was 0.5%） demonstrated excellent humidity-responsive characteristics， as the realitive humidity increased from 50% to 99%， the film changed from yellow-green to red， while also exhibiting good reversible humidity performance (over 20 cycles). Additionally， the film displayed sensitive identification of trace amounts of water in ethanol/water mixtures， gradually changing from red to yellow-green as the water content decreased. Leveraging the responsive characteristics of CNC to H₂O molecules， photonic films exhibited reversible behavior in humidity sensing and moisture detection. |
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