Micropencils and microhexagonal cones of ZnO

Ramgir, Niranjan S. ; Mulla, Imtiaz S. ; Pillai, Vijayamohanan K. (2006) Micropencils and microhexagonal cones of ZnO The Journal of Physical Chemistry B, 110 (9). pp. 3995-4001. ISSN 1089-5647

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp056629b

Related URL: http://dx.doi.org/10.1021/jp056629b

Abstract

Shape selective synthesis of ZnO micropencils and microhexagonal cones has been demonstrated using a controlled method of modified vapor deposition. A plausible growth mechanism based on the results of scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetry, and differential thermal analysis is proposed. Our results suggest that growth of micropencil takes place as per the vapor-liquid-solid progression while the microhexagonal cones grow in two steps following a vapor-solid/vapor-liquid-solid mechanism. Moreover, the geometry, the location of substrate and temperature are found to have key roles in governing the morphology. XPS studies clearly demonstrate the presence of Si species as SiO and SiO2, which act as catalysts enabling nucleating sites for ZnO microstructural growth.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:80407
Deposited On:31 Jan 2012 14:16
Last Modified:31 Jan 2012 14:16

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