“…In addition, from the environmentally sustainable viewpoint, it is important to utilize biodegradable polymers such as alginate for the synthesis of the blocking layer. Alginate is a natural polysaccharide made up of two linear block copolymer structure l -guluronic acids (G) and d -mannuronic acids (M) which has been excessively used for the synthesis of various edible coatings and shielding materials because of its biocompatibility, ease of functionalization, and outstanding film-forming ability. , Moreover, it can be cross-linked with divalent and multivalent cations like calcium, iron, zinc, and nickel, performs gelation easily, and becomes insoluble and hence can be widely used in the food industry, in electronic devices, in pharmaceutical industries, for cell immobilization, in tissue engineering, and so on. , However, pure alginate and cross-linked alginate films exhibit several drawbacks during practical application including low performance of mechanical and gas barrier properties and weak water resistivity, electrical, and thermal properties. , There have been various approaches taken to overcome those obstacles, including the blending of other polymers, the addition of cross-linkers, and the most recent use of organic or inorganic additives. Recently, inorganic additives including ZnO, TiO 2 , CeO 2 , and nanoparticles , have been used with polymeric reinforced materials.…”