Containing the catalysts: diameter controlled Ge nanowire growth

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Lotty, Olan
Biswas, Subhajit
Ghoshal, Tandra
Glynn, Colm
O'Dwyer, Colm
Petkov, Nikolay
Morris, Michael A.
Holmes, Justin D.
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Royal Society of Chemistry
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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.
Crystalline quality , Diameter distributions , Growth substrates , Metal assisted etchings , Narrow size distributions , Particle depositions , Semiconductor nanowire , Templating method , Coalescence , Effluent treatment , Germanium , Nanoparticles , Nanowires , Size distribution , Supercritical fluids , Silver
LOTTY, O., BISWAS, S., GHOSHAL, T., GLYNN, C., O' DWYER, C., PETKOV, N., MORRIS, M. A. & HOLMES, J. D. 2013. Containing the catalyst: diameter controlled Ge nanowire growth. Journal of Materials Chemistry C, 1, 4450-4456.
© Royal Society of Chemistry 2013.