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Schematic of the fabrication procedures of a 3D graphene material with a sponge as a template. a Preparation route for RGO/PU (or PVC) sponges and their multidimensional sensor applications. Reproduced with permission from Ref. [74]. Copyright 2017 Elsevier Ltd. b The fabrication procedures of the flexible tactile sensor array using PU as a template. Reproduced with permission from Ref. [76]. Copyright 2018 IEEE
