Germanium nanowire synthesis from fluorothiolate-capped gold nanoparticles in supercritical carbon dioxide
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Accepted version
Date
2010-08-20
Authors
Collins, Gillian
Koleśnik-Gray, Maria M.
Krstić, Vojislav
Holmes, Justin D.
Journal Title
Journal ISSN
Volume Title
Publisher
American Chemical Society (ACS)
Published Version
Abstract
Ge nanowires seeded from Au nanoparticles capped with fluorothiolate ligands were synthesized in supercritical carbon dioxide (sc-CO2) by the thermal decomposition of diphenylgermane (DPG) at a temperature of 380 °C and a pressure of 25.7 MPa. Both perfluorinated and semifluorinated capped Au nanoparticles acted as effective catalysts for growing Ge nanowires, with mean diameters of 11 nm (σ = 2.8) and 14 nm (σ = 3.5), respectively. The mean diameter of the Ge nanowires grown from the fluorous-capped Au nanoparticles were considerably smaller than those synthesized from dodecanethiol-capped nanoparticles in sc-toluene, under the same reaction conditions, i.e., 28 nm and σ = 10.3. Differences in the ligand conformations on the surface of the Au nanoparticles and phase separation of the fluorocarbon/CO2 and hydrocarbon/toluene systems gave rise to greater steric stabilization of the fluorous-capped Au nanoparticles in CO2, resulting in small diameter nanowires with a relatively narrow size distribution. Electrical analysis of the nanowires showed them to be p-type (hole) semiconductors.
Description
Keywords
Gold , Carbon dioxide , Electric wire , Germanium , Ligands , Nanoparticles , Nanowires , Phase separation , Pyrolysis , Supercritical fluid extraction , Synthesis (chemical) , Toluene , Germanium nanowires
Citation
Collins, G., Koleśnik, M., Krstić, V. and Holmes, J. D. (2010) 'Germanium Nanowire Synthesis from Fluorothiolate-Capped Gold Nanoparticles in Supercritical Carbon Dioxide', Chemistry of Materials, 22(18), pp. 5235-5243. doi: 10.1021/cm1012137
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Copyright
© 2010 American Chemical Society. 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. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/cm1012137