UV-Vis quantification of the iron content in iteratively steam and HCl purified single-walled carbon nanotubes.

Autor: Martincic M; Institut de Ciència de Materiales de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra, Barcelona, Spain., Tobías-Rossell G; Institut de Ciència de Materiales de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra, Barcelona, Spain.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2024 May 10; Vol. 19 (5), pp. e0303359. Date of Electronic Publication: 2024 May 10 (Print Publication: 2024).
DOI: 10.1371/journal.pone.0303359
Abstrakt: As-produced carbon nanotubes contain impurities which can dominate the properties of the material and are thus undesired. Herein we present a multi-step purification treatment that combines the use of steam and hydrochloric acid in an iterative manner. This allows the reduction of the iron content down to 0.2 wt. % in samples of single-walled carbon nanotubes (SWCNTs). Remarkably, Raman spectroscopy analysis reveals that this purification strategy does not introduce structural defects into the SWCNTs' backbone. To complete the study, we also report on a simplified approach for the quantitative assessment of iron using UV-Vis spectroscopy. The amount of metal in SWCNTs is assessed by dissolving in HCl the residue obtained after the complete combustion of the sample. This leads to the creation of hexaaquairon(III) chloride which allows the determination of the amount of iron, from the catalyst, by UV-Vis spectroscopy. The main advantage of the proposed strategy is that it does not require the use of additional complexing agents.
Competing Interests: The authors have declared that no competing interests exist
(Copyright: © 2024 Martincic, Tobías-Rossell. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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