Unsafe food cause serious threat to public health and the economy, exploiting effective food quality assessment strategies has attracted concerns worldwide. Herein, inspired by Canna micro-nano hierarchical structure, a generic, facile, and highly processable roll-to-roll and solvent evaporation-induced self-assembly fabrication method is introduced to fabricate regenerated cellulose based superhydrophobic and icephobic hierarchical colorimetric sensing film for real-time visual monitoring of food freshness. The synergistic effect from macromolecular chains attraction and nanoscaled aggregation renders the colorimetric sensing film with excellent mechanical strength of 105.07 MPa and superhigh shear modulus of 17.28 GPa. Upon applied tension, the vigorous intermolecular interactions make the film extraordinary structure stability. The optimized colorimetric sensing film exhibits microscaled pores for sensing performance and three-dimensional nanoflower morphologies for superhydrophobic (water contact angle of 155.1 °and roll-off angle of 7.8°) and icephobic that delay the freezing time of 40 μL water droplets (45 s to 265 s) and reduce the bonding strength of ice (599.72 kPa to 45.53 kPa). What counts is the first time bestowed with icephobicity to food freshness colorimetric sensing film, which mitigating the interference of the covered ice layer against the colorimetric, and providing a more reasonable monitoring in food freshness. These results benefit for stimulating new design principles of colorimetric sensing films, and also provide promising applications in extremely cold environments.

不安全食品对公众健康和经济造成严重威胁，利用有效的食品质量评估策略已引起全世界的关注。在此，受到美人蕉的启发微纳分级结构，一种通用、简便、高度可加工的卷对卷和溶剂蒸发诱导自组装制造方法，用于制造基于再生纤维素的超疏水和疏冰分级比色传感薄膜，用于实时视觉监测食物新鲜度。大分子链吸引力和纳米级聚集的协同效应使比色传感薄膜具有105.07 MPa的优异机械强度和17.28 GPa的超高剪切模量。在施加张力时，剧烈的分子间相互作用使薄膜具有非凡的结构稳定性。优化的比色传感薄膜具有微尺度孔隙，可实现传感性能和三维超疏水（水接触角为155.1°，滚降角为7.8°）和疏冰的纳米花形态，延迟了40μL水滴的冻结时间（45秒至265秒）并降低了冰的结合强度（599.72kPa至45.53 kPa）。重要的是，首次赋予食品新鲜度比色传感膜以疏冰性，减少覆盖冰层对比色的干扰，为食品新鲜度提供更合理的监测。这些结果有利于激发比色传感薄膜的新设计原理，并在极冷环境中提供有前景的应用。