Multicomponent structural color membrane based on soft lithography array for high-sensitive Raman detection

Hydroxypropyl cellulose (HPC) photonic films with ordered surface arrays were successfully prepared by double-imprint soft lithography, doping and regulation of cellulose nanocrystals (CNC) can improve their optical and mechanical properties. Furthermore, SiO2@PDA was loaded on the substrate to help prepare highly saturated plasma film by in-situ reduction of Ag/Au nanoparticles, which showed high SERS activity and sensitivity, stability and reproducibility. [Display omitted] Inspired by ordered photonic crystals and structural color materials in nature, we successfully prepared hydroxypropyl cellulose (HPC) photonic films with ordered surface arrays by double-imprint soft lithography. Then we introduced another important material of the cellulose family, cellulose nanocrystals (CNC), which has liquid crystal nature and birefringent properties of the particles, into the system to realize the single-point shrinkage of the film array and the control of structural color. Through multi-component doping and concentration control, we further optimized the multi-scale structure of the materials, and obtained HPC/CNCs composite photonic films with excellent properties in color, stability and flexibility, whose elastic modulus and tensile properties are significantly higher than those of single-component. Further loading of SiO2@PDA enhances the color saturation and realizes the in-situ reduction of metal ions on the film surface. This plasma film can track a variety of substances with high sensitivity and long-term stability, showing potential application prospects in the field of surface-enhanced Raman scattering (SERS), which provides a potential possibility for chiral structures to be used in the field of biosensor detection and circularly polarized luminescence.