Circularly Polarized Luminescent Chiral Photonic Films Based on theCoassembly of Cellulose Nanocrystals and Gold Nanoclusters br

In this work, we studied the formation and properties ofcompositefilms coassembled by cellulose nanocrystals (CNCs) and bovineserum albumin-stabilized gold nanoclusters (BSA-AuNCs). The influences ofthe BSA-AuNC concentration on the structure and optical properties ofCNC-based compositefilms were further studied. It was found that thecompositefilm retained the chiral nematic structure and optical activity. Theself-assembled CNC and BSA-AuNC helical superstructures can producestrong, left-handed, circularly polarized luminescence with dissymmetryfactors up to 0.287. Meanwhile, the third component, polyethylene glycol,was introduced without affecting the structural color andfluorescencecharacteristics of the compositefilm to enhance theflexibility of thefilm. Thesimplicity of thefilm preparation, the abundance of CNCs, and theflexibility and stability of the compositefilms pave the way for theproduction of functional materials with integrated functions.