Journal article
Polymer-like C : H thin film coating of nanopowders in capacitively coupled RF discharge
Plasma chemistry and plasma processing, v 24(2), pp 189-216
01 Jun 2004
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Nanopowders of amorphous SiO2, with typical particle sizes of 30 - 80 nm, were treated under the non-equilibrium plasma conditions, created by a capacitively coupled (CC) RF discharge formed in pure methane or ethane. The plasma gas flow rate varied between 0.02 and 0.06 slpm, with reactor pressures between 1000 and 5000 Pa, and applied RF power inputs between 700 and 1500 W. The plasma properties were monitored through measurements of the rotational temperature, as derived from the C-2 5160 Angstrom Swan band and N-2 second positive 3577 Angstrom band, and the atomic hydrogen excitation temperature, from the H-beta, H-gamma and H-delta lines during the powder treatment process. The compositions of the gases that passed through the plasma were analyzed by mass spectrometry. In spite of the evidence for the presence of CnH2n+2 and CnH2n (n = 1 - 3) species and acetylene in the discharge, the homogeneous formation of soot was not observed. At the same time, the introduced nanoparticles were observed to act as centers for the inception and growth of C: H thin coatings in the form of a polymer-like hydrocarbon layers, of thickness between < 5 and 30 nm. The results of TEM, IR spectroscopy, thermo-gravimetric and precision calorimetric analysis performed on the treated powders provide evidence to the formation of an amorphous, high density C: H matrix on the particles' surfaces.
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Details
- Title
- Polymer-like C : H thin film coating of nanopowders in capacitively coupled RF discharge
- Creators
- A Kouprine - Université de SherbrookeF Gitzhofer - Université de SherbrookeM Boulos - Université de SherbrookeA Fridman - Drexel University
- Publication Details
- Plasma chemistry and plasma processing, v 24(2), pp 189-216
- Publisher
- Kluwer Academic/Plenum Publ
- Number of pages
- 28
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000188423900004
- Scopus ID
- 2-s2.0-3543117186
- Other Identifier
- 991019168212204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Engineering, Chemical
- Physics, Applied
- Physics, Fluids & Plasmas