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Zinc oxide nanowiresProfessor Zhong Lin Wang at the Georgia Institute of Technology has devised a sensor that can harvest mechanical energy and convert it into electricity.
The green field is an electron microscope image of an array of zinc oxide nanowires. In the middle is a drawing of how the probe, from an atomic force microscope, bends the nanowires. The third field shows the voltages produced by the array as it is scanned.