Real-time monitoring of nucleation-growth cycle of carbon nanoparticles in acetylene plasmas
Hundt, Morten, Sadler, Patrick, Levchenko, Igor, Wolter, Matthias, Kersten, Holger, & Ostrikov, Kostya (2011) Real-time monitoring of nucleation-growth cycle of carbon nanoparticles in acetylene plasmas. Journal of Applied Physics, 109(12), pp. 123305-1.
Quantum cascade laserabsorption spectroscopy was used to measure the absolute concentration of acetylene in situ during the nanoparticle growth in Ar + C2H2 RF plasmas. It is demonstrated that the nanoparticle growth exhibits a periodical behavior, with the growth cycle period strongly dependent on the initial acetylene concentration in the chamber. Being 300 s at 7.5% of acetylene in the gas mixture, the growth cycle period decreases with the acetylene concentration increasing; the growth eventually disappears when the acetylene concentration exceeds 32%. During the nanoparticle growth, the acetylene concentration is small and does not exceed 4.2% at radio frequency (RF) power of 4 W, and 0.5% at RF power of 20 W. An injection of a single acetylene pulse into the discharge also results in the nanoparticlenucleation and growth. The absorption spectroscopy technique was found to be very effective for the time-resolved measurement of the hydrocarbon content in nanoparticle-generatingplasmas.
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|Item Type:||Journal Article|
|Divisions:||Current > QUT Faculties and Divisions > Science & Engineering Faculty|
|Copyright Owner:||Copyright 2011 American Institute of Physics|
|Deposited On:||10 Jul 2014 04:18|
|Last Modified:||11 Jul 2014 01:58|
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