Browsing by Author "Sorokin, Pavel B."

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Adhesion of Single-Walled Carbon Nanotube Thin Films with Different Materials
(2020-01-16) M Rajanna, Pramod; Luchkin, Sergey; Larionov, Konstantin V.; Grebenko, Artem; Popov, Zakhar I.; Sorokin, Pavel B.; Danilson, Mati; Bereznev, Sergei; Lund, Peter D.; Nasibulin, Albert G.
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Single-walled carbon nanotubes (SWCNTs) possess extraordinary physical and chemical properties. Thin films of randomly oriented SWCNTs have great potential in many opto-electro-mechanical applications. However, good adhesion of SWCNT films with a substrate material is pivotal for their practical use. Here, for the first time, we systematically investigate the adhesion properties of SWCNT thin films with commonly used substrates such as glass (SiO2), indium tin oxide (ITO), crystalline silicon (C-Si), amorphous silicon (a-Si:H), zirconium oxide (ZrO2), platinum (Pt), polydimethylsiloxane (PDMS), and SWCNTs for self-adhesion using atomic force microscopy. By comparing the results obtained in air and inert Ar atmospheres, we observed that the surface state of the materials greatly contributes to their adhesion properties. We found that the SWCNT thin films have stronger adhesion in an inert atmosphere. The adhesion in the air can be greatly improved by a fluorination process. Experimental and theoretical analyses suggest that adhesion depends on the atmospheric conditions and surface functionalization.
Single-step extraction of small-diameter single-walled carbon nanotubes in the presence of riboflavin
(2022-12-22) Kalachikova, Polina M.; Goldt, Anastasia E.; Khabushev, Eldar M.; Eremin, Timofei V.; Zatsepin, Timofei S.; Obraztsova, Elena D.; Larionov, Konstantin V.; Antipina, Liubov Yu; Sorokin, Pavel B.; Nasibulin, Albert G.
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
We propose a novel approach to disperse and extract small-diameter single-walled carbon nanotubes (SWCNTs) using an aqueous solution of riboflavin and Sephacryl gel. The extraction of small-diameter semiconducting SWCNTs was observed, regardless of the initial diameter distribution of the SWCNTs. Dispersion of SWCNTs occurs due to the adsorption of π-conjugated isoalloxazine moieties on the surface of small-diameter nanotubes and interactions between hydroxy groups of ribityl chains with water. During the SWCNT extraction, specific adsorption of riboflavin to SWCNTs leads to the minimization of interactions between the SWCNTs and gel media. Our experimental findings are supported by ab initio calculations demonstrating the impact of the riboflavin wrapping pattern around the SWCNTs on their interaction with the allyl dextran gel.