3D printed noise-cancelling triboelectric nanogenerator

The table of contents entry: A fully-packaged and noise canceled, cylinder-shaped TENG with polydimethylsiloxane bumpy balls is fabricated by a 3D printer. The device generates an output power of 45 mW, enough DC power for charging a battery of smart watch. The noise occurring during the operation is canceled to the noise level (~ 50 dB) of a normal conversation, by approximately 20 dB, by using Ag nanowires-embedded polyurethane sponge.210