▎ 摘　　要

Considerable attention has been drawn for fabricating novel systems imitating natural structures, but progress remains slow in the practical applications. In this direction, hydrogel films with a nacre-like structure based on Chitosan (CS) and Graphene Oxide (GO) have been synthesized with metal ion crosslinking. Several characterization techniques were utilized for establishing the successful synthesis and optimization of the hydrogel films. Fourier Transform Infrared Spectroscopy distinctly confirms Mg2+ ion coordination with the layers of GO. SEM images depict the nacre-like layered structure of the metal ion crosslinked hydrogels. Enhanced thermal properties observed is due to the metal ion crosslinking. The pH-responsive behavior of the films is revealed by the swelling study performed for the hydrogels in basic, water, and acidic media. Incorporation of metal ion inside the gel film has rendered improved mechanical properties to the film. Mimicking the strength of natural costal cartilage, the elongation at break and tensile strength of the metal ion modified hydrogel films are found to be 2.51% and 38.0 MPa, respectively. The hydrogel films are found to have 84% increase in tensile strength and 83% increase in Young's modulus. The gel films exhibit remarkable shape memory behavior at around 25 degrees C in alcoholic solutions.