We find that when a falling water droplet spreads on the PTFE surface, it bridges the originally disconnected components (the PTFE/ITO and aluminum electrode) into a closed-loop, electrical
system
Interesting.
Fig. 1 | Design of the DEG. a, Schematic diagram. b, Optical image showing four
parallel DEG devices fabricated on a glass substrate. The volume of each
droplet is 100.0 μl. c, As individual droplets continue to impinge on the asfabricated device, the amount of charge on the PTFE surface increases
gradually and eventually reaches a stable value. d, One hundred commercial
LEDs can be powered when one droplet, released from a height of 15.0 cm, is in
contact with the device. e, Under the same experimental conditions (for
example, the same droplet size and height of release), the output voltage
measured from the DEG (in red, with the frequency of impinging droplets being