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Formation and characterization of germanium nanoparticles

Published online by Cambridge University Press:  31 January 2011

N. J. Welham
N. J. Welham*
Affiliation:
Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 2600, Australia
*
a)e-mail: nicholas.welham@anu.edu.au
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Abstract

Elemental germanium was mechanically milled with magnesium oxide with the intention of forming disperse nanoparticulate germanium in a soluble matrix. The crystallite size was determined by x-ray diffraction (XRD) and Raman spectroscopy using a phonon confinement model. The crystallite size was found to decrease exponentially with milling time; however, the size determined by XRD was typically five to ten times greater than that by Raman. This was attributed to the presence of two separate crystallite sizes, which were averaged when using the Scherrer equation for the XRD data. Sonication of the powder resulted in the breakup of >20 μm aggregates into individual particles of approximately 40 nm. These particles are thought to compose a single crystal core with a crystallite size of approximately 28 nm surrounded by a layer of smaller crystallites (approximately 5 nm), which showed quantization during Raman spectroscopy. Separation of the germanium from the magnesium oxide was readily achieved using a simple acid leach, although some oxidation of germanium was evident when using an aqueous leach.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 11 , November 2000 , pp. 2400 - 2407
Copyright
Copyright © Materials Research Society 2000

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