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Issue 29, 2013
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Containing the catalyst: diameter controlled Ge nanowire growth

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Sub-20 nm diameter Ge nanowires with narrow size distributions were grown from Ag nanoparticle seeds in a supercritical fluid (SCF) growth process. The mean Ge nanowire diameter and size distribution was shown to be dependent upon Ag nanoparticle coalescence, using both spin-coating and a block copolymer (BCP) templating method for particle deposition. The introduction of a metal assisted etching (MAE) processing step in order to “sink” the Ag seeds into the growth substrate, prior to nanowire growth, was shown to dramatically decrease the mean nanowire diameter from 27.7 to 14.4 nm and to narrow the diameter distributions from 22.2 to 6.8 nm. Hence, our BCP-MAE approach is a viable route for controlling the diameters of semiconductor nanowires whilst also ensuring a narrow size distribution. The MAE step in the process was found to have no detrimental effect on the length or crystalline quality of the Ge nanowires synthesised.

Graphical abstract: Containing the catalyst: diameter controlled Ge nanowire growth

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Article information

06 May 2013
11 Jun 2013
First published
11 Jun 2013

J. Mater. Chem. C, 2013,1, 4450-4456
Article type

Containing the catalyst: diameter controlled Ge nanowire growth

O. Lotty, S. Biswas, T. Ghoshal, C. Glynn, C. O' Dwyer, N. Petkov, M. A. Morris and J. D. Holmes, J. Mater. Chem. C, 2013, 1, 4450
DOI: 10.1039/C3TC30846D

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