A generator includes a first conductive layer, a plurality of elongated piezoelectric nanostructures and a conductive electrode. The piezoelectric nanostructures extend upwardly from the first conductive layer and include a carbon nanotube core and a piezoelectric sheath enveloping at least a portion...http://www.google.es/patents/US8022601?utm_source=gb-gplus-sharePatente US8022601 - Piezoelectric-coated carbon nanotube generators
