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A chemically cross-linked polyacrylamide gel (AM) prepared without graphene and a series of hybrid graphene-polyacrylamide gels (AMGX, being X the graphene concentration used in mg mL −1) were
The chemical structures of the samples (alginate, polyacrylamide and CLIP-printed hydrogel with ionic crosslinking) were examined by a Fourier transform infrared (FTIR) spectrometer (Nicolet Magna-IR 550, USA) in the wavenumber range from 600 to 4000 cm −1 with a resolution of 2 cm-1. For the printed hydrogel sample with ionic crosslinking
