Preparation of Photonic Crystal Based Tunable Structural Color

Structural color based on photonic crystal was fabricated in this work and then tuned to give visible light. To reach this goal mono size polystyrene latex synthesized first. By deposition of mono disperse polystyrene latex with average size of ۲۲۰ nm on a glass surface, an opal was fabricated as SEM images verify. According to Bragg's law the opal has a green structural color. By change in the space between polystyrene spheres the reflected wavelength varied and another structural color generated. Hydrogels can tune the space between polystyrene spheres by swelling and shrinking when adsorb and desorb water or humidity. Acrylamide monomer and N,N methylene bis-acrylamide crosslinking agent in an aqueous solution injected into the space between PS particles and polymerized. In this stage opal hydrogel composite (OHC) is fabricated and can be used as tunable structural color by means of humidity. This implies a kind of smartness to the composite.

کلیدواژه ها:

Structural Color ، Photonic Crystal ، Opal ، Hydrogel ، polystyrene Latex