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Nanohardness (a) and elastic modulus (b) for different amount of ZnO NPs incorporated CS films. * denotes significant difference between CS films containing different percentage of ZnO NPs (p<0.05). ● denotes significant difference in CS films containing different percentage of ZnO NPs compared with CS only film (p<0.05). Nanohardeness and elastic modulus increase with the increase of ZnO NPs in the CS film.
