Self-Powered Nanosystems DOI: 10.1002/anie.201201656 Nanotechnology-Enabled Energy Harvesting for Self- Powered Micro-/Nanosystems Zhong Lin Wang* and Wenzhuo Wu A ngewandte Chemi e Keywords: energy conversion · nanogenerators · nanotechnology · photovoltaics · self-powered nanosystems . Angewandte Reviews Z.L. Wang and W. Wu 11700 www.angewandte.org  2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Angew. Chem. Int. Ed. 2012, 51, 11700 – 11721