Temperature dependence of nucleation and growth of nanoparticles in low pressure Ar/CH4 RF discharges

J. Beckers, W.W. Stoffels, G.M.W. Kroesen

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

24 Citaties (Scopus)

Uittreksel

The gas temperature (Tg) dependence of nucleation and growth processes of hydrocarbon nanoparticles in low pressure Ar/CH4 RF discharges has been investigated. Measuring the electron density with the microwave cavity resonance technique allowed us to monitor nucleation processes on small (µs) time scales. On larger time scales, coagulation times and growth rates are determined by means of measuring the phase angle between the RF voltage and current in correlation with laser light scattering. The experimental results show a significant gas temperature dependence of both powder nucleation and growth processes. Within the measured gas temperature range (20-130 °C) the particle growth rate decreases by a factor of ~3.7, while the coagulation time increases by a factor of ~6.5 with increasing Tg. Moreover, in this paper we present a simplified model which uses the experimentally determined growth rates and coagulation times to predict the value of the critical density of nanometre sized neutral particles, necessary to initiate coagulation. This model estimates a critical density of 3.5 × 1015 m-3 at room temperature which decreases with increasing temperature.
TaalEngels
Pagina's155206-1/10
TijdschriftJournal of Physics D: Applied Physics
Volume42
Nummer van het tijdschrift15
DOI's
StatusGepubliceerd - 2009

Vingerafdruk

Discharge (fluid mechanics)
coagulation
Coagulation
Nucleation
low pressure
nucleation
Nanoparticles
nanoparticles
temperature dependence
gas temperature
Gases
Temperature
neutral particles
Hydrocarbons
Light scattering
Powders
Carrier concentration
light scattering
phase shift
hydrocarbons

Citeer dit

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abstract = "The gas temperature (Tg) dependence of nucleation and growth processes of hydrocarbon nanoparticles in low pressure Ar/CH4 RF discharges has been investigated. Measuring the electron density with the microwave cavity resonance technique allowed us to monitor nucleation processes on small (µs) time scales. On larger time scales, coagulation times and growth rates are determined by means of measuring the phase angle between the RF voltage and current in correlation with laser light scattering. The experimental results show a significant gas temperature dependence of both powder nucleation and growth processes. Within the measured gas temperature range (20-130 °C) the particle growth rate decreases by a factor of ~3.7, while the coagulation time increases by a factor of ~6.5 with increasing Tg. Moreover, in this paper we present a simplified model which uses the experimentally determined growth rates and coagulation times to predict the value of the critical density of nanometre sized neutral particles, necessary to initiate coagulation. This model estimates a critical density of 3.5 × 1015 m-3 at room temperature which decreases with increasing temperature.",
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Temperature dependence of nucleation and growth of nanoparticles in low pressure Ar/CH4 RF discharges. / Beckers, J.; Stoffels, W.W.; Kroesen, G.M.W.

In: Journal of Physics D: Applied Physics, Vol. 42, Nr. 15, 2009, blz. 155206-1/10.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Temperature dependence of nucleation and growth of nanoparticles in low pressure Ar/CH4 RF discharges

AU - Beckers,J.

AU - Stoffels,W.W.

AU - Kroesen,G.M.W.

PY - 2009

Y1 - 2009

N2 - The gas temperature (Tg) dependence of nucleation and growth processes of hydrocarbon nanoparticles in low pressure Ar/CH4 RF discharges has been investigated. Measuring the electron density with the microwave cavity resonance technique allowed us to monitor nucleation processes on small (µs) time scales. On larger time scales, coagulation times and growth rates are determined by means of measuring the phase angle between the RF voltage and current in correlation with laser light scattering. The experimental results show a significant gas temperature dependence of both powder nucleation and growth processes. Within the measured gas temperature range (20-130 °C) the particle growth rate decreases by a factor of ~3.7, while the coagulation time increases by a factor of ~6.5 with increasing Tg. Moreover, in this paper we present a simplified model which uses the experimentally determined growth rates and coagulation times to predict the value of the critical density of nanometre sized neutral particles, necessary to initiate coagulation. This model estimates a critical density of 3.5 × 1015 m-3 at room temperature which decreases with increasing temperature.

AB - The gas temperature (Tg) dependence of nucleation and growth processes of hydrocarbon nanoparticles in low pressure Ar/CH4 RF discharges has been investigated. Measuring the electron density with the microwave cavity resonance technique allowed us to monitor nucleation processes on small (µs) time scales. On larger time scales, coagulation times and growth rates are determined by means of measuring the phase angle between the RF voltage and current in correlation with laser light scattering. The experimental results show a significant gas temperature dependence of both powder nucleation and growth processes. Within the measured gas temperature range (20-130 °C) the particle growth rate decreases by a factor of ~3.7, while the coagulation time increases by a factor of ~6.5 with increasing Tg. Moreover, in this paper we present a simplified model which uses the experimentally determined growth rates and coagulation times to predict the value of the critical density of nanometre sized neutral particles, necessary to initiate coagulation. This model estimates a critical density of 3.5 × 1015 m-3 at room temperature which decreases with increasing temperature.

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