Abstract
A technique for increasing the degree of dispergation of TUBALL (OCSiAl) single-walled carbon nanotubes (SWCNTs) and for obtaining individual nanotubes was developed. A combination of steps including preliminary purification of the starting SWCNTs from residues of iron-containing catalyst, ultrasonic dispergation of SWCNTs, chemical shortening of SWCNTs, mild fluorination of SWCNTs in BrF3 vapors, centrifugation of a dispersion of SWCNTs in o-dichlorobenzene, and isolation of individual SWCNTs during supernatant filtration was used. This procedure led to a decrease in the average length of SWCNTs and a noticeable decrease in the diameter of their bundles. A considerable portion of a dispersion of SWCNTs separated in this manner consisted of individual nanotubes with diameters of 1–2 nm, in addition, there were bundles with diameters of up to 6 nm. This technique made it possible to obtain photovoltaic cells based on a composite of a conjugated polymer of poly-3-hexylthiophene (P3HT) and fluorinated SWCNTs with a reproducible photovoltaic effect. The energy of the boundary LUMO of fluorinated SWCNTs was determined to be equal to −4.3 eV by cyclic voltammetry. This is suitable for light-induced electron transfer from P3HT and most other donor polymers to fluorinated SWCNTs.
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Funding
This work was funded by the Russian Foundation for Basic Research (RFBR) and Novosibirsk Region (Project No. 20-43-540025). This research was financially supported by the RFBR (Project No. 18-29-19089mk) and in accordance with the state assignment of V. V. Voevodsky Institute of Chemical Kinetics and Combustion of the Siberian Branch of the Russian Academy of Sciences (No. AAAA-A21-121011390038-1).
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Dedicated to Academician of the Russian Academy of Sciences R. Z. Sagdeev on the occasion of his 80th birthday.
Published in Russian in Izvestiya AkademiiNauk. Seriya Khimicheskaya, No. 12, pp. 2427–2433, December, 2021.
This paper does not contain descriptions of studies on animals or humans.
The authors declare no competing interests.
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Kobeleva, E.S., Nevostruev, D.A., Uvarov, M.N. et al. Fluorination of single-walled carbon nanotubes and their application in organic photovoltaic cells as an electron acceptor. Russ Chem Bull 70, 2427–2433 (2021). https://doi.org/10.1007/s11172-021-3363-4
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DOI: https://doi.org/10.1007/s11172-021-3363-4