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Piezoelectric Nanogenerators Based on Zinc Oxide Nanowire Arrays
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Piezoelectric Nanogenerators Based on Zinc Oxide Nanowire Arrays 14 APRIL 2006 VOL 312 SCIENCE Zhong Lin Wang and Jinhui Song We have converted nanoscale mechanical energy into electrical energy by means of piezoelectric zinc oxide nanowire (NW) arrays. The aligned NWs are deflected with a conductive atomic force microscope tip in contact mode. The coupling of piezoelectric and semiconducting properties in zinc oxide creates a strain field and charge separation across the NW as a result of its bending. The rectifying characteristic of the Schottky barrier formed between the metal tip and the NW leads to electrical current generation. The efficiency of the NW-based piezoelectric power generator is estimated to be 17 to 30%. This approach has the potential of converting mechanical, vibrational, and/or hydraulic energy into electricity for powering nanodevices. http://free.elmo.net.cn/?phdl |
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