Fig. 1

Physicochemical Characteristics of GelAlg and GelAlg@rGO hydrogels. (A) SEM images of GelAlg formed from 100 mg ml^− 1 Gel and 75 mg ml^− 1 Alg (left) as well as GelAlg@rGO formed from 100 mg ml^− 1 Gel, 75 mg ml^− 1Alg and 0.2 mg ml^− 1rGO (right). (B) Texture analysis with time and distance via uniaxial compression experiments. (C) Rheological analysis of the hydrogels together with mechanical stability at different temperatures. (D) Photothermal analysis of hydrogels when immersed in water for 5 min and illuminated at 808 nm with P = 2 W cm^− 2