Powder Temperature, Size, and Number Density in Laser-Driven Reactions

Flint, Jane; Marra, Robert A.; Haggerty, J. S.

doi:10.1080/02786828608959091

Cited by 26 publications

(7 citation statements)

References 12 publications

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“…Solid product of silane decomposition is fornned both as aerosol particles [8][9][10][11][12][13][14][15][16][17] and as a deposit on the reactor walls [4,5]. Even at relatively high pressures the contribution from heterogeneous reactions on the surface of a deposited solid product can be comparable with the homogeneous decomposition [18].…”

Section: Introductionmentioning

confidence: 71%

EPR investigation of a-Si:H aerosol particles formed under silane thermal decomposition

et al. 1998

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The dangling bond defects were investigated in a-Si:H particles formed under silane thermal decomposition in flow reactor. EPR together with hydrogen evolution method were used. The experimental results allowed us to conclude that there are two kinds of dangling bond defects in aSi:H aerosol particles. The defects of the first kind are localized on the surface of interconnected microvoids and microchannels (surface dangling bonds) and those of the second kind are embedded in amorphous silicon network (volume dangling bonds). The thermal equilibration of dangling bonds and temperature dependence of equilibrium dangling bond concentration were investigated. It was found that at temperatures >400 K the dangling bond concentration N reversibly depends on sample temperature. The volume dangling bond concentration increases with temperature increasing (the effective activation energy of dangling bond formation U> 0), and the surface dangling bond concentration decreases with temperature increasing (U < 0). It has been found that EPR line is considerably asymmetric for samples with high hydrogen content and for low hydrogen content the EPR line is weakly asymmetric. A conclusion was drawn that the asymmetry degree depends on amorphous silicon lattice distortions. This conclusion has been confirmed by EPR spectra simulations.

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Section: Introductionmentioning

confidence: 71%

EPR investigation of a-Si:H aerosol particles formed under silane thermal decomposition

et al. 1998

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“…Further, the absolute sensitivities with respect to geometric standard deviation are generally greatest for the cases of Flint et al (1986), Nguyen & Flagan (1991) and Onischuk et al (2000) (Fig. 4(a)).…”

Section: Breakdown Of Sensitivitiesmentioning

confidence: 90%

“…There is a wealth of experimental conditions at which the silicon nanoparticle synthesis model can be evaluated (Flint et al, 1986;Frenklach et al, 1996;Körmer et al, 2010;Nguyen & Flagan, 1991;Wu et al, 1987). These are given in Table 3.…”

Section: Analysis Proceduresmentioning

confidence: 99%

Global sensitivity analysis of a model for silicon nanoparticle synthesis

Menz

Brownbridge

Kraft

2014

Journal of Aerosol Science

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“…7 The Lorentz-Mie theory of scattering has been applied to this case by assuming that each particle scatters separately with no optical interference among scattering. If the incident and scattered light are polarized orthogonally to the scattering plane, the scattered light at right angles measured from the detector in a solid angle d is W c and the scatter/extinction ratio is given by Eqn [1], where I 0 and I are the incident and transmitted He-Ne laser intensity, i c the Mie scattering function and C ext the extinction crosssection per particle.…”

Section: Methodsmentioning

confidence: 99%

Particle size control and optical properties of laser-synthesized silicon nanopowders

Botti

Celeste

Coppola

1998

Appl. Organometal. Chem.

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Silicon nanoparticles have been synthesized by heating reactant gases with a 500 W CO2 laser. A technique based on scattering of He–Ne laser light by particulates in a reaction flame has been developed for probing the particle size evolution during the process, in order to scale down the particle diameter (under 10 nm). The optical and structural properties of laser‐synthesized silicon nanopowders obtained in different runs are reported. © 1998 John Wiley & Sons, Ltd.

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Powder Temperature, Size, and Number Density in Laser-Driven Reactions

Cited by 26 publications

References 12 publications

EPR investigation of a-Si:H aerosol particles formed under silane thermal decomposition

EPR investigation of a-Si:H aerosol particles formed under silane thermal decomposition

Global sensitivity analysis of a model for silicon nanoparticle synthesis

Particle size control and optical properties of laser-synthesized silicon nanopowders

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