Piezoelectric ZnO Nanostructure for Energy Harvesting, by Yamin Leprince-Wang

By Yamin Leprince-Wang

Over the prior decade, ZnO as an incredible II-VI semiconductor has attracted a lot realization in the medical group over the realm because of its quite a few special and wealthy homes. This fabric, regarded as a “future material”, particularly in nanostructural structure, has aroused many fascinating learn works because of its huge variety of functions in electronics, photonics, acoustics, power and sensing. The bio-compatibility, piezoelectricity & affordable fabrication make ZnO nanostructure a truly promising fabric for power harvesting.

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5(b) and (c) reveal the detail of the PMMA coating on the ZnO nanowire arrays. After an ultraviolet (UV) treatment of the PMMA, top electrode arrays were sputtered through a shadow mask on the surface of ZnO nanowires. 5(d) shows the SEM image of the square-shaped aluminum pads (80 μm in width) on the ZnO, on which we can see that the ZnO nanowire array has been quiet well recovered by an Al layer [BRO 14]. 6(a) and (b) show the characteristic I–V curves from the asymmetric configuration (Al/ZnO/Au), measured both on the electrodeposited ZnO thin films and nanowire arrays, respectively.

Effect of the growth time The growth time has also an important influence on the morphology of ZnO nanowire in the hydrothermal process. 0), a series of samples, of which the growth time varies from 30 min to 6 h, has been performed to better understand the growth kinetic. 5 μm-length for 6 h growth. 17. SEM images of ZnO nanowires synthesized for growth time of 30 min a), 1 h b), 2 h c), 3 h d), 5 h e) and 6 h f), respectively. 5 nm/min. These results are in agreement with those reported in literature.

1. Electrochemical deposition for ZnO nanostructure The synthesis of ZnO nanowires by electrodeposition is a soft chemistry method at low temperatures (T < 100°C). It is cheap in capital investment and low energy consumption during the synthesis. In addition, it is mainly carried out in aqueous media making it one of the most environmentally friendly methods. In 1996, Izaki et al. [IZA 96] and Lincot et al. [PEU 96] were the first to simultaneously synthesize the nanostructural ZnO polycrystalline films by electrodeposition.

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