What are triboelectric nanogenerators? Explain the different modes of their operation.
Triboelectric nanogenerators are nanoscale energy harvesting devices that convert mechanical energy from ambient motions such as vibration, sliding, contact, or human movement into electrical energy based on the combined effects of triboelectrification and electrostatic induction. When two materials with different electron affinities come into physical contact, surface charges are generated due to electron _____ ____ ________ _____ _______ _____ ___ _______ ____ _________.
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