Optical properties of sol-gel coatings on plastic foils embossed with surface-relief gratings

关键词 Sol-gels;Organic coatings;Plastic products;Diffraction gratings;Optical properties;Substrates;Sols;Titanium dioxide;Coating techniques;Composite materials;Scanning electron microscopy;Ultraviolet spectroscopy;Infrared spectroscopy摘　　要A novel technique has been developed to fabricate surface-relief gratings using sol-gel derived porous coating on plastic foil substrates.Organically modified TiO//2 sol was prepared by roll-coating on OPP foil substrates.The plastic films coated with TiO//2 nano-particles were embossed to form surface-relief gratings with microstructures.The morphology of the porous coatings and the micro-structures were investigated using electron scanning microscopy (SEM).Optical transmission of the films was measured using UV-VIS and IR spectroscopy.The diffraction efficiency of the gratings on the coated plastic foil was examined in terms of fabrication conditions.It was shown that special figures could be seen in the films when the angle of view was changed.The final products of the composite films are transparent and suitable for industry manufacture and applications.

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