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Protecting Carbon Nanotubes from Oxidation for Selective Carbon Impurity Elimination

Berrada, Nawal and Desforges, Alexandre and Bellouard, Christine and Flahaut, Emmanuel and Gleize, Jérôme and Ghanbaja, Jaafar and Vigolo, Brigitte Protecting Carbon Nanotubes from Oxidation for Selective Carbon Impurity Elimination. (2019) Journal of Physical Chemistry C, 123 (23). 14725-14733. ISSN 1932-7447

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Official URL: https://doi.org/10.1021/acs.jpcc.8b12554

Abstract

Purity of carbon nanotubes (CNTs) is essential to avoid a dramatic decrease in their performances. In addition to metallic impurities, carbonaceous impurities have been shown to be responsible for pronounced effects. However, they are highly difficult to be selectively removed from CNT samples because of the similar chemical reactivity of these two kinds of carbon species. The existing purification methods often lead to high CNT consumption (>90 wt %). The proposed method consists of a one-pot gas-phase treatment combining chlorine and oxygen. The CNT powder maintained in a chlorine stream is submitted to oxygen at moderate temperature [350 and 500 °C for single-walled CNTs (SWCNTs) and double-walled CNTs (DWCNTs), respectively], and the thermal treatment is then pursued at 900–1000 °C under chlorine alone. Our work reveals that this approach is able to significantly improve the selectivity of elimination of carbonaceous impurities. Thanks to the proposed purification treatment, only 19 and 11 wt % of carbon species (mainly carbon impurities) are lost for DWCNTs and SWCNTs, respectively. The mechanism proposed involves a protective effect by grafting of chlorine favored to the CNT walls. Because our simple one-pot purification method is also versatile and scalable, it opens new perspectives for CNT applications in high-added value fields.

Item Type:Article
HAL Id:hal-02186871
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Lorraine (FRANCE)
Laboratory name:
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Deposited By: cirimat webmestre
Deposited On:17 Jul 2019 12:52

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