Fig. 12

Chemical functionalization of TENG surface layer. a Fabrication process of TENGs from the thiol-SAM functionalized Au films (i) and from SAM surface functionalized SiO2 (ii) (Reproduced with permission from Ref. [82]). b Synthesis of PVDF-Gn graft copolymers and schematic diagram of the fabrication process for the PVDF-Gn-based TENG (Reproduced with permission from Ref. [83]). c Schematic diagram of polydopamine modification of paper (Reproduced with permission from Ref. [84]). d Schematic illustration of surface treatment of polydimethylsiloxane (PDMS) polymer film and a TENG device (Reproduced with permission from Ref. [85])