Synthesis and modification of carbon nanohorns structure for hyperthermic application

Gurova, Olga A.; Omelyanchuk, L. V.; Dubatolova, T. D.; Antokhin, E.; Eliseev, V. S.; Yushina, I. V.; Окотруб, А. В.

doi:10.1134/s0022476617060191

Cited by 9 publications

(8 citation statements)

References 27 publications

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“…The effective absorption of visible and near-infrared light makes CNT perspective as a heating agent. In particular, laser irradiation on CNTs ablated cancer cells [47][48][49] and provoked significant rise of local temperature of tissues containing injected nanotubes [50][51][52] and myosin molecules adsorbed above them [53]. The laser irradiation induces very fast, high temperature thermal cycles in CNT, which even could produce nanodiamonds [54].…”

Section: Light Irradiation Of Sulfur-contained Swcntsmentioning

confidence: 99%

Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

et al. 2020

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Filling of single-walled carbon nanotubes (SWCNTs) and extraction of the encapsulated species from their cavities are perspective treatments for tuning the functional properties of SWCNT-based materials. Here, we have investigated sulfur-modified SWCNTs synthesized by the ampoule method. The morphology and chemical states of carbon and sulfur were analyzed by transmission electron microscopy, Raman scattering, thermogravimetric analysis, X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopies. Successful encapsulation of sulfur inside SWCNTs cavities was demonstrated. The peculiarities of interactions of SWCNTs with encapsulated and external sulfur species were analyzed in details. In particular, the donor–acceptor interaction between encapsulated sulfur and host SWCNT is experimentally demonstrated. The sulfur-filled SWCNTs were continuously irradiated in situ with polychromatic photon beam of high intensity. Comparison of X-ray spectra of the samples before and after the treatment revealed sulfur transport from the interior to the surface of SWCNTs bundles, in particular extraction of sulfur from the SWCNT cavity. These results show that the moderate heating of filled nanotubes could be used to de-encapsulate the guest species tuning the local composition, and hence, the functional properties of SWCNT-based materials.

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Section: Light Irradiation Of Sulfur-contained Swcntsmentioning

confidence: 99%

Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

et al. 2020

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“…The XPS C 1s spectra were fitted by four components ( Figure 7 a,b). A low-energy asymmetric peak with the full width at half maximum (FWHM) of 1.3 eV located at 284.5 eV corresponds to sp 2 carbon atoms [ 15 , 35 ] constituted a well-ordered region of nanohorns. The symmetric peak at 285.3–285.5 eV can be assigned to C–H bonds [ 57 ] and sp 2 carbon atoms, which are neighbors to C–O moieties.…”

Section: Resultsmentioning

confidence: 99%

“…During the synthesis, the CNHs are combined into spherical particles, which can form large van der Waals associates [ 1 , 2 , 3 , 4 , 5 ]. High pore volume [ 6 , 7 , 8 ] and specific surface area (SSA) [ 9 , 10 ] make CNHs very promising for nanofluids [ 11 , 12 ], catalysis [ 13 , 14 ], medicine [ 15 , 16 , 17 , 18 ], electrochemistry [ 9 , 19 ], electromagnetic [ 2 , 5 , 20 ] and sensing applications [ 6 , 21 , 22 ]. In this regard, the improvement of availability of their pores for guest species, the increase of the SSA value, and the enhancement of the stability of their suspensions become very important.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly for carbon nanotubes, oxidation is the most studied method of chemical modification of CNHs [ 3 , 15 , 23 , 24 ]. The treatment of CNHs with acids [ 15 , 16 , 25 , 26 ] and heating in a presence of oxygen [ 9 , 12 , 22 , 27 , 28 , 29 ] could etch endcaps of nanohorns or/and open nanowindows in their walls resulting in a significant increase of the SSA value ( ca. 2.6 and 4 times, respectively [ 30 ]).…”

Section: Introductionmentioning

confidence: 99%

“…2.6 and 4 times, respectively [ 30 ]). At the same time, the surface modification of CNHs with different oxygen-containing moieties, such as –OH, −COOH, −C=O, −C−O−C− groups [ 1 , 3 , 15 , 31 ], is a basic strategy to improve the stability of aqueous suspensions of CNHs. Therefore, both the thermal and acid oxidation of nanohorns allow increasing the SSA and dispersibility of CNHs in solutions simultaneously.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Toluene Addition in an Electric Arc on Morphology, Surface Modification, and Oxidation Behavior of Carbon Nanohorns and Their Sedimentation in Water

et al. 2021

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Carbon nanohorns (CNHs) are attractive for various applications, where a high specific surface area and long dispersion stability in water are important. In the present work, we study these parameters of CNHs prepared by arc evaporation of graphite depending on the conditions of the synthesis and subsequent oxidation in air. It is shown that the addition of toluene in the reactor during the arcing allows obtaining CNHs functionalized with −CHx groups. Heating of CNHs in air at 400 °C leads to substitution of −CHx groups for oxygen-containing groups. Moreover, the CNH endcaps are opened at 500 °C, and as a result, the specific surface area of CNHs increases 4 times. Aqueous suspensions with a concentration of oxidized CNHs of 100 µg/mL are stable for 8 months.

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