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Nanorod arrays as photocatalysts

By Paul Grad |

Many ZnO@TiO2 core-shell nanorod arrays (the notation means ZnO is the core inside the TiO2 shell) with good photocatalytic activity have been designed and synthesized. There has been an increasing interest in the design and synthesis of those arrays to improve the quantum efficiency of dye-sensitized solar cells, to produce highly transparent self-cleaning coatings for LEDs, and to use as photocatalysts for the decomposition of organic pollutants in wastewater. However, it is still necessary to develop a low-temperature, low-cost and environmentally friendly way to prepare those arrays over a large area for future device applications. Now a team from Huaibei Normal University (Huaibei, China; www.hbcnc.edu.cn), has reported a facile, green and efficient route for the preparation of ZnO@TiO2 nanorod arrays with a highly uniform core-shell structure over a large area on a Zn wafer. The team uses a vapor-thermal method at relatively low temperature. The team said the photocatalytic decomposition of methylene blue revealed that the arrays have excellent photocatalytic activity compared with the performance of the ZnO nanorod arrays. According to the team, the superior photocatalytic performance could be attributed to the fact that…
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