The evolution of pseudo-spherical silicon nanocrystals to tetrahedra, mediated by phosphonic acid surfactants

Christopher A. Barrett; Calum Dickinson; S. Ahmed; Thomas Hantschel; Kai Arstila; Kevin M. Ryan

doi:10.1088/0957-4484/20/27/275605

The evolution of pseudo-spherical silicon nanocrystals to tetrahedra, mediated by phosphonic acid surfactants

Christopher A. Barrett, Calum Dickinson, S. Ahmed, Thomas Hantschel, Kai Arstila, Kevin M. Ryan

Research output: Contribution to journal › Article › peer-review

Abstract

Silicon nanocrystals were synthesized at high temperatures and high pressures by the thermolysis of diphenylsilane using a combination of supercritical carbon dioxide and phosphonic acid surfactants. Size and shape evolution from pseudo-spherical silicon nanocrystals to well-faceted tetrahedral-shaped silicon crystals with edge lengths in the range of 30-400nm were observed with sequentially decreasing surfactant chain lengths. The silicon nanocrystals were characterized by transmission electron microscopy (TEM), energy-dispersive x-ray spectroscopy (EDX), x-ray diffraction (XRD), photoluminescence (PL), scanning electron microscopy (SEM) and Raman scattering spectroscopy.

Original language	English
Article number	275605
Journal	Nanotechnology
Volume	20
Issue number	27
DOIs	https://doi.org/10.1088/0957-4484/20/27/275605
Publication status	Published - 2009

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AU - Ryan, Kevin M.

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The evolution of pseudo-spherical silicon nanocrystals to tetrahedra, mediated by phosphonic acid surfactants

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