Embodiments relate to an apparatus for energy harvesting and electric power generators, especially at the nano-scale. The apparatus includes two electrodes positioned proximate to each other. The first electrode has a first work function value and the second electrode has a different second work function value. A separation material is positioned between the first and second electrodes. The separation material includes a first surface in at least partial physical contact with the first electrode and a second surface positioned opposite from the first surface. The second surface is in at least partial physical contact with the second electrode. The first and second electrodes and the separation material form an at least partially arcuate energy harvesting device.
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