Synthesis of Amorphous Silicon Colloids by Trisilane Thermolysis in High Temperature Supercritical Solvents
- 8 July 2004
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 20 (16), 6546-6548
- https://doi.org/10.1021/la048671o
Abstract
Colloidal submicrometer-diameter amorphous silicon (a-Si) particles are synthesized with >90% yield by thermal decomposition of trisilane (Si3H8) in supercritical hexane at temperatures ranging from 400 to 500 °C and pressures up to 345 bar. A range of synthetic conditions was explored to optimize the quality of the product. Under the appropriate synthetic conditions, the colloids are spherical and unagglomerated. The colloids can be produced with average diameters ranging from 50 to 500 nm by manipulating the precursor concentration, temperature, and pressure. Relatively narrow particle size distributions, as measured by transmission electron microscopy (TEM), with standard deviations about the mean as low as ∼ ±10% could be obtained in some cases. We explored the thermal annealing of the amorphous silicon particles after isolation from the reactor and found that crystallization to diamond structure silicon occurred at temperatures as low as 650 °C. The amorphous and crystalline materials were characterized by X-ray diffraction and high resolution scanning and transmission electron microscopy.Keywords
This publication has 9 references indexed in Scilit:
- Pressure Dependence of Solvation Dynamics of Coumarin 480 in EthanolThe Journal of Physical Chemistry A, 2002
- Preparation of fine silicon particles from amorphous silicon monoxide by the disproportionation reactionJournal of Crystal Growth, 2001
- Mechanism of thermal decomposition of silanesRussian Chemical Reviews, 2001
- Chemical Approaches to Three-Dimensional Semiconductor Photonic CrystalsAdvanced Materials, 2001
- Control of Thickness and Orientation of Solution-Grown Silicon NanowiresScience, 2000
- Thermochemistry and Kinetics of Silicon Hydride Cluster Formation during Thermal Decomposition of SilaneThe Journal of Physical Chemistry B, 1998
- Mechanically Attrited Silicon for High Refractive Index NanocompositesChemistry of Materials, 1997
- Surface chemistry of Luminescent Silicon NanocrystallitesAdvanced Materials, 1997
- Controlled growth of monodisperse silica spheres in the micron size rangeJournal of Colloid and Interface Science, 1968