On-line Measurement of the Size of Silicon Carbide (SiC) Nanoparticles Introduction Silicon carbide (SiC) has physical and chemical properties suited to the most demanding industries. Its use is therefore very widespread, not just in electronics on account of its wide band semi-conductor performance, but also in the nuclear field where it is used for its excellent resistance to ionising radiation and its chemical and thermal stability. This material may be synthesised using conventional powder metallurgy techniques. More recently, the production of SiC nanoparticles on an industrial scale has been carried out by dry process by means of laser or plasma pyrolysis. Figure 1 : Laser pyrolysis nanoparticles synthsis Laser pyrolysis Laser pyrolysis consists in radiating a gas, a liquid or a suspension by a CO2 laser beam in order to form nanoparticles (figure 1). This process is based on a step of absorption of the infrared radiation of the laser by the molecular compounds (gas, liquid or suspension) followed by the homogenous nucleation and growth of the nanoparticles. The production of nanoparticles using this technique enables yields greater than several hundreds of grams per hour to be attained. Argon Argon Argon Precursors Laser beam The syntheses of SiC nanoparticles by laser pyrolysis developed at the CEA (French Commision for Atomic Energy) are conducted using a silane, for example SiH4, and acetylene, C 2 H 4 , as precursor reagents. This synthesis process produces nanoparticles in the form of aggregates. The input flows of the precursor gases thus makes it possible to obtain structures organised into more or less compact strings (figure 2). Synthesis of SiC nanoparticles 200 nm Figure 2 : Aggregate morphology as a function of synthesis parameters 012 www.cilas.com [email protected]
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012-On-line Measurement of the Size of Silicon Carbide (SiC) Nanoparticles
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On-line Measurement of the Size of Silicon Carbide (SiC) Nanoparticles
Introduction
Silicon carbide (SiC) has physical and chemical properties suited to the most demanding industries. Its
use is therefore very widespread, not just in electronics on account of its wide band semi-conductor
performance, but also in the nuclear field where it is used for its excellent resistance to ionising radiation
and its chemical and thermal stability.
This material may be synthesised using conventional powder metallurgy techniques. More recently, the production of SiC nanoparticles on an industrial scale has been carried out by dry process by means of
laser or plasma pyrolysis.
Figure 1: Laser pyrolysis nanoparticles synthsis
Laser pyrolysis
Laser pyrolysis consists in radiating a gas, a liquid or
a suspension by a CO2 laser beam in order to form
nanoparticles (figure 1).
This process is based on a step of absorption of the
infrared radiation of the laser by the molecular
compounds (gas, liquid or suspension) followed by
the homogenous nucleation and growth of the
nanoparticles.
The production of nanoparticles using this technique
enables yields greater than several hundreds of grams per hour to be attained.
Argon Argon
ArgonPrecursors
Laser beam
The syntheses of SiC nanoparticles by laser
pyrolysis developed at the CEA (French Commision
for Atomic Energy) are conducted using a silane, for
example SiH4, and acetylene, C2H4, as precursor
reagents.
This synthesis process produces nanoparticles in
the form of aggregates.
The input flows of the precursor gases thus makes it
possible to obtain structures organised into more or