Nanopicture of the Day

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February 6, 2004

ZnO Hexagonal Nanocrystallites

Source:  Yicheng Lu, Sriram Muthukumar, and Nuri Emanetoglu,

 

      References:

"Selective MOCVD growth of ZnO nanotips", Muthukumar, S. Haifeng Sheng, Jian Zhong, Zheng Zhang, Emanetoglu, N.W., Yicheng Lu; Nanotechnology, IEEE, Volume 2, Issue 1, Mar 2003.


Description:

ZnO nano materials are promising candidates for nano electronic and photonics. Compared with other semiconductor materials, ZnO has higher exciton binding engery(60 meV), is more resistant to radiation, and is multifunctional with uses in the areas as a piezoelectric, ferroelectric and ferromagnetic. Well-aligned ZnO nanowires can be grown on various substrates at low temperature by MOCVD.  The selective growth of ZnO nanowires on patterned SOS(silicon on r-sapphire) has also been demonstrated, which promises the integration of ZnO-based semiconductor and nanowire devices on a single chip. So far, the various applications of ZnO nano materials such as biosensors, UV detetors and FED are under way.

Different shaped ZnO nanopillars can be obtained by varying the deposition conditions. This SEM photograph shows hexagonal ZnO nanocrystallites.

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