Diameter controlled germanium nanowires with lamellar twinning and polytypes

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Biswas, Subhajit
Doherty, Jessica
Majumdar, Dipanwita
Ghoshal, Tandra
Rahme, Kamil
Conroy, Michele
Singha, Achintya
Morris, Michael A.
Holmes, Justin D.
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American Chemical Society
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One-dimensional nanostructures with controllable morphologies and defects are appealing for use in nanowire devices. This paper details the influence of colloidal magnetite iron oxide nanoparticle seeds to regulate the radial dimension and twin boundary formation in Ge nanowires grown through a liquid-injection chemical vapor deposition process. Control over the mean nanowire diameter, even in the sub-10 nm regime, was achieved due to the minimal expansion and aggregation of iron oxide nanoparticles during the growth process. The uncommon occurrence of heterogeneously distributed multiple layer {111} twins, directed perpendicular to the nanowire growth axis, were also observed in 〈111〉-directed Ge nanowires, especially those synthesized from patterned hemispherical Fe3O4 nanodot catalysts. Consecutive twin planes along 〈111〉-oriented nanowires resulted in a local phase transformation from 3C diamond cubic to hexagonal 4H allotrope. Localized polytypic crystal phase heretostructures were formed along 〈111〉-oriented Ge nanowire using magnetite nanodot catalysts.
Agglomeration , Catalysts , Chemical vapor deposition , Germanium , Iron oxides , Magnetite , Magnetite nanoparticles , Metal nanoparticles , Nanoparticles , Nanostructured materials , Nanostructures , Nanowires , Controllable morphology , Germanium nanowires , Germanium nanowires , Liquid injections , Multiple layers , Nanowire devices , Nanowire growth , One-dimensional nanostructure , Process control
BISWAS, S., DOHERTY, J., MAJUMDAR, D., GHOSHAL, T., RAHME, K., CONROY, M., SINGHA, A., MORRIS, M. A. & HOLMES, J. D. 2015. Diameter-Controlled Germanium Nanowires with Lamellar Twinning and Polytypes. Chemistry of Materials, 27, 3408-3416. http://dx.doi.org/10.1021/acs.chemmater.5b00697
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© American Chemical Society, 2015. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. doi: 10.1021/acs.chemmater.5b00697