期刊
JOURNAL OF APPLIED PHYSICS
卷 109, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3599893
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资金
- German Research Foundation (DFG) [SFB-TR24 B13]
- Australian Research Council
- CSIRO
Quantum cascade laser absorption 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 nanoparticle nucleation and growth. The absorption spectroscopy technique was found to be very effective for the time-resolved measurement of the hydrocarbon content in nanoparticle-generating plasmas. (C) 2011 American Institute of Physics. [doi:10.1063/1.3599893]
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