Fig. 1
From: Triboelectric nanogenerators as flexible power sources

a Theoretical model for dielectric-to-dielectric mode. Reproduced with permission.19 Copyright 2013 American Chemical Society. b Construction of the first flexible TENGE. Reproduced with permission.7 Copyright 2012 Elsevier. c Proposed mechanism of the TENG. Reproduced with permission.23 Copyright 2012 American Chemical Society