Figure 3
Proposed mechanism for DC power generation from the ZnO nanosheet-based nanogenerator.
a, A nanogenerator is electrically neutral under no external force. b, When ZnO nanosheets are subjected to an external force, the nanosheets are buckled and generate piezoelectric potential. A positive potential is produced at the stretched side of the nanosheets and a negative potential is induced at the compressed side. Also, a positive charge layer of the LDH that is interfaced with nanosheets is compensated with the free electrons transported from the ZnO nanosheets. Consequently, the LDH layer is of a dominated negative potential. c, Electrons injected from the top electrode by overcoming a Schottky barrier between the top electrode and the ZnO nanosheets reduce the piezoelectric potential as time goes on at holding time.
