468432 PMMA/TiO2 One-Dimensional Photonic Crystal Films with Structural Colors
Here, nanoparticle-nanoparticle based organic-inorganic complex one-dimensional photonic crystal films were first designed with poly(methyl methacrylate) (PMMA) nanoparticles as low refractive index material and TiO2 nanoparticles as a high refractive index one, and PMMA/TiO2 stacks with structural colors were assembled through layer-by-layer spin coating. PMMA and TiO2 nanoparticles with average diameter of about 40nm were first prepared. We used PMMA nanoparticles as low refractive index material and TiO2 nanoparticles as the high refractive index one, and assembled PMMA/TiO2 one-dimensional photonic crystals with structural colors through layer-by-layer spin coating. By adjusting the parameters of the nanoparticle dispersion and spin coating, such as the concentration of nanoparticles, rate and times of spin coating, and the stack number, we prepared angle-dependent structure colors of wide range from violet to nearly red. The morphology, reflective spectra and color properties of the one-dimensional photonic crystal films were investigated. This method can be effectively used for assembling other functional organic/inorganic complex one-dimensional photonic crystals for a wide usage.