Technical Report 102, c4e-Preprint Series, Cambridge

Synthesis of silicon nanoparticles with a narrow size distribution: a theoretical study

ref: Technical Report 102, c4e-Preprint Series, Cambridge

Authors: William J. Menz, Shraddha Shekar, George Brownbridge, Richard Körmer, Wolfgang Peukert, and Markus Kraft

Associated Themes: Nanoparticles and Particle Processes

Abstract

This work presents a fully-coupled gas-phase and particle model for the synthesis of narrowly-distributed silicon nanoparticles from the thermal decomposition of silane, which simultaneously solves the kinetic mechanism of Swihart & Girshick (1999, J. Phys. Chem. B 103 64-76) with a detailed particle model. The model was applied to simulate the hot-wall reactor and process conditions of Körmer et al. (2010, J. Aerosol Sci. 41 998-1007). It was found that after a short burst of inception and condensation, growth occurred through coagulation and sintering of small particles into larger primaries. The sintering parameters were estimated by fitting the mode and variance of the experimental primary particle PSD to experimental data. Excellent agreement was obtained for four cases at a range of temperatures and residence times. The model is additionally in qualitative correspondence with homogeneous nucleation theory and comparison of TEM-style images is encouraging.

Material from this preprint has been published in: Journal of Aerosol Science 44, 46-61, (2012)

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