Fig. 2

Characterization of the Cu-based hydrogel. A Photographs of the sol-to-gel transition and SEM image of the surface of the hydrogel. B Storage and loss modulus changes of the hydrogel at 37 °C, a frequency of 1 Hz and a strain of 1%. C.Temperature variation curve of hydrogel, CuCl₂ solution and HA-SH solution with NIR laser irradiation. D Release profiles of NO from hydrogel with or without NIR laser irradiation. E Cumulative release profiles of HSA protein from hydrogel in different buffer solution (pH = 5.4 and 7.4). F MB degradation rate of Cu-based hydrogel after addition of GSH with different concentration of H₂O₂. G Generation of ·OH through the reaction of hydrogel and H₂O₂ by oxidation of TMB