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Reaction kinetics and temperature effects in syngas photo-initiated chemical vapor deposition on single-walled carbon nanotubes

Seyedehsan Hosseininasab, Nathalie Faucheux, Gervais Soucy and Jason Robert Tavares

Article (2019)

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Abstract

Photo-initiated chemical vapor deposition (PICVD) is a solvent-free process that can be used to produce thin films on a variety of substrates, with applications in fields ranging from biomedicine to optics and microelectronics. This study presents a kinetic analysis for this process using syngas (CO + H2) as a precursor for the surface treatment of single-walled carbon nanotubes (SWCNT) with average dimensions of 1.5 × 100 nm (diameter × length), and addresses the role of iron pentacarbonyl (Fe(CO)5), a photo-active contaminant found in CO. This work builds upon previously developed reaction schemes for PICVD, based mainly on surface characterizations, by coupling these analyses with gas-phase monitoring. This allows us to propose two separate reaction schemes for the gas and surface phase reactions and consider temperature effects. Online FTIR, offline GC-MS, and online GC characterized the gas phase, while for surface characterizations, XPS and TGA were used. Characterizations showed that a coating with a general formula of CnO3nFen was deposited, corresponding to 0.29 ± 0.04 mg carbon and 0.49 ± 0.03 mg iron on the SWCNT substrate over the course of treatment. The Fe(CO)5 was identified as the key reactant in syngas/PICVD reactions and was nearly completely consumed (94%). Mass balances derived from the gas phase characterization showed that Fe(CO)5 inputted to the plug flow reactor could potentially contribute all the amount of 0.49 ± 0.03 mg of Fe and 0.29 ± 0.04 mg of C to the coating on the SWCNT, indicating that syngas/PICVD can be optimized in the future to decrease gas throughput. Temperature did not show a significant effect in the case of PICVD. However, in the absence of ultraviolet light, its role becomes determinant, with rising temperatures causing more Fe deposition.

Uncontrolled Keywords

PICVD; Photo-initiator; Coating; Iron Pentacarbonyl; Surface Treatment

Subjects: 1700 Design and manufacturing > 1702 Advanced manufacturing
1800 Chemical engineering > 1800 Chemical engineering
2000 Materials science and technology > 2001 Materials structure, properties and testing
2000 Materials science and technology > 2004 Polymers and coatings
Department: Department of Chemical Engineering
Funders: Fonds de recherche du 516 Québec - Nature et technologies (FRQNT)
Grant number: 173942
PolyPublie URL: https://publications.polymtl.ca/10440/
Journal Title: Journal of Nanoparticle Research (vol. 21, no. 6)
Publisher: Springer
DOI: 10.1007/s11051-019-4558-6
Official URL: https://doi.org/10.1007/s11051-019-4558-6
Date Deposited: 29 Aug 2022 10:49
Last Modified: 24 May 2023 03:11
Cite in APA 7: Hosseininasab, S., Faucheux, N., Soucy, G., & Tavares, J. R. (2019). Reaction kinetics and temperature effects in syngas photo-initiated chemical vapor deposition on single-walled carbon nanotubes. Journal of Nanoparticle Research, 21(6). https://doi.org/10.1007/s11051-019-4558-6

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