Fig. 1

A Gel formed with various concentrations of PVA and ROS-sensitive linker (TSPBA). B Scanning electron microscopy (SEM) visualization of Gel-3 (6%PVA: 6%TSPBA = 1:1) (scale bar = 60 μm). C Frequency spectra and D strain spectra of the elastic (G') and viscous (G") moduli of Gel-1 (6%PVA: 9%TSPBA = 1:1), Gel-2 (9%PVA: 9%TSPBA = 1:1), Gel-3 (6%PVA: 6%TSPBA = 1:1) and Gel-4 (9%PVA: 6%TSPBA = 1:1). E The swelling ratio of Gel with different concentration ratios (n = 3). *** indicates p < 0.001