In Situ Optical Emission Spectroscopic Investigations During Arc Plasma Synthesis of Iron Oxide Nanoparticles by Thermal Plasma

Investigations using in situ precursor spectroscopy during the growth of nanoparticles of iron oxide by thermal plasma induced gas phase condensation method have been shown to be useful for correlating the size of nanoparticles with existing plasma parameters. The relative abundance of ionized Fe sp...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2006-08, Vol.34 (4), p.1175-1182
Main Authors: Banerjee, I., Joshi, N.K., Sahasrabudhe, S.N., Kulkarni, N.V., Karmakar, S., Pasricha, R., Ghorui, S., Tak, A.K., Murthy, S.P.S.S., Bhoraskar, S.V., Das, A.K.
Format: Article
Language:English
Subjects:
Anodes
Argon
Atomic measurements
Coagulation
Correlation
Inductors
Iron
Iron oxides
Nanoparticles
Particle size
Plasma
Plasma arc device
plasma-materials processing applications
Plasmas
Spectroscopy
Spectrum analysis
Stimulated emission
Synthesis
Thermal plasmas
Transmission electron microscopy
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Summary:Investigations using in situ precursor spectroscopy during the growth of nanoparticles of iron oxide by thermal plasma induced gas phase condensation method have been shown to be useful for correlating the size of nanoparticles with existing plasma parameters. The relative abundance of ionized Fe species inside the plasma plume is seen to directly establish the relation between particle size, arc current, arc length, and ambient pressure of the reacting oxygen gas. The argon plasma from a transferred arc reactor is made to impinge on the anode that is allowed to vaporize and react with oxygen. The spectral line profiles of both Ar and Fe along the plasma column during the synthesis of nanoparticles have been proved to be useful in understanding the growth mechanism. Band intensities of FeO molecular states indicated the inverse relation with particle sizes that have been correlated to the two competitive processes in which energy is released, namely: 1) one involving the radiative transition and 2) the other that of the growth by coagulation. Atomic Boltzmann plots are used for estimating the temperatures of the zones, whereas particle sizes have been inferred using transmission electron microscopic measurements
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2006.878430