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Talyzin, Alexandr V
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Publications (10 of 65) Show all publications
Talyzin, A., Klechikov, A., Korobov, M., Rebrikova, A. T., Avramenko, N. V., Gholami, M. F., . . . Rabe, J. P. (2015). Delamination of graphite oxide in a liquid upon cooling. Nanoscale, 7(29), 12625-12630
Open this publication in new window or tab >>Delamination of graphite oxide in a liquid upon cooling
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2015 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 7, no 29, p. 12625-12630Article in journal (Refereed) Published
Abstract [en]

Graphite oxide (GO) in liquid acetonitrile undergoes a transition from an ordered phase around ambient temperature to a gel-like disordered phase at temperatures below 260 K, as demonstrated by in situ X-ray diffraction. The stacking order of GO layers is restored below the freezing point of acetonitrile (199 K). The reversible swelling transition between a stacked crystalline phase and an amorphous delaminated state observed upon cooling provides an unusual example of increased structural disorder at lower temperatures. The formation of the gel-like phase is attributed to the thermo-responsive conformational change of individual GO flakes induced by stronger solvation. Scanning force microscopy demonstrates that GO flakes deposited onto a solid substrate from acetonitrile dispersions at a temperature below 260 K exhibit corrugations and wrinkling which are not observed for the flakes deposited at ambient temperature. The thermo-responsive transition between the delaminated and stacked phases reported here can be used for sonication-free dispersion of graphene oxide, micro-container applications, or the preparation of new composite materials.

National Category
Materials Chemistry
Identifiers
urn:nbn:se:umu:diva-107187 (URN)10.1039/c5nr02564h (DOI)000358207700046 ()26147576 (PubMedID)
Funder
Swedish Research Council, 621-2012-3654
Available from: 2015-08-19 Created: 2015-08-19 Last updated: 2018-02-07Bibliographically approved
Baburin, I. A., Klechikov, A., Mercier, G., Talyzin, A. & Seifert, G. (2015). Hydrogen adsorption by perforated graphene. International journal of hydrogen energy, 40(20), 6594-6599
Open this publication in new window or tab >>Hydrogen adsorption by perforated graphene
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2015 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 40, no 20, p. 6594-6599Article in journal (Refereed) Published
Abstract [en]

We performed a combined theoretical and experimental study of hydrogen adsorption in graphene systems with defect-induced additional porosity. It is demonstrated that perforation of graphene sheets results in increase of theoretically possible surface areas beyond the limits of ideal defect-free graphene (∼2700 m2/g) with the values approaching ∼5000 m2/g. This in turn implies promising hydrogen storage capacities up to 6.5 wt% at 77 K, estimated from classical Grand canonical Monte Carlo simulations. Hydrogen sorption was studied for the samples of defected graphene with surface area of ∼2900 m2/g prepared using exfoliation of graphite oxide followed by KOH activation. The BET surface area of studied samples thus exceeded the value of single-layered graphene. Hydrogen uptake measured at 77 K and 296 K amounts to 5.5 wt% (30 bar) and to 0.89 wt% (120 bar), respectively. 

Place, publisher, year, edition, pages
Elsevier, 2015
Keyword
Graphene-based nanostructures, Hydrogen storage, High surface area, Porous materials
National Category
Physical Sciences Materials Chemistry
Identifiers
urn:nbn:se:umu:diva-104374 (URN)10.1016/j.ijhydene.2015.03.139 (DOI)000354581100013 ()
Available from: 2015-07-06 Created: 2015-06-10 Last updated: 2018-02-07Bibliographically approved
Klechikov, A. G., Mercier, G., Merino, P., Blanco, S., Merino, C. & Talyzin, A. V. (2015). Hydrogen storage in bulk graphene-related materials. Microporous and Mesoporous Materials, 210, 46-51
Open this publication in new window or tab >>Hydrogen storage in bulk graphene-related materials
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2015 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 210, p. 46-51Article in journal (Refereed) Published
Abstract [en]

Hydrogen sorption properties of graphene-related materials were studied by gravimetric and volumetric methods at 2931< and 77K. Rapid thermal exfoliation of different types of graphite oxide (GO) precursors yielded samples with maximal surface areas up to 850 m(2)/g, whereas surface areas up to 2300 m(2)/g were achieved by post-exfoliation activation treatments. Therefore, hydrogen storage parameters of graphene materials could be evaluated in a broad range of surface areas. The H-2 uptake vs surface area trend revealed in this study shows that hydrogen storage by graphene materials do not exceed 1 Wt% at 120 Bar H-2 at ambient temperatures. Linear increase of hydrogen adsorption vs surface area was observed at 77 K with maximal observed value of similar to 5 Wt% for 2300 m(2)/g sample. It can be concluded that bulk graphene samples obtained using graphite oxide exfoliation and activation follow standard for other nanostructured carbons hydrogen uptake trends and do not demonstrate superior hydrogen storage parameters reported in several earlier studies. Nevertheless, graphene remains to be one of the best materials for physisorption of hydrogen, especially at low temperatures.

Keyword
Graphene, Graphene oxide, Hydrogen storage
National Category
Physical Sciences Materials Chemistry
Identifiers
urn:nbn:se:umu:diva-103716 (URN)10.1016/j.micromeso.2015.02.017 (DOI)000353733300007 ()
Available from: 2015-06-11 Created: 2015-05-28 Last updated: 2018-02-07Bibliographically approved
Anoshkin, I., Talyzin, A., Nasibulin, N., Krasheninnikov, A., Jiang, H., Nieminen, R. & Kauppinen, E. (2014). Coronene Encapsulation in Single-Walled Carbon Nanotubes: Stacked Columns, Peapods, and Nanoribbons. ChemPhysChem, 15(8), 1660-1665
Open this publication in new window or tab >>Coronene Encapsulation in Single-Walled Carbon Nanotubes: Stacked Columns, Peapods, and Nanoribbons
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2014 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 15, no 8, p. 1660-1665Article in journal (Refereed) Published
Abstract [en]

Encapsulation of coronene inside single-walled carbon nanotubes (SWNTs) was studied under various conditions. Under high vacuum, two main types of molecular encapsulation were observed by using transmission electron microscopy: coronene dimers and molecular stacking columns perpendicular or tilted (45-608) with regard to the axis of the SWNTs. A relatively small number of short nanoribbons or polymerized coronene molecular chains were observed. However, experiments performed under an argon atmosphere (0.17 MPa) revealed reactions between the coronene molecules and the formation of hydrogen-terminated graphene nanoribbons. It was also observed that the morphology of the encapsulated products depend on the diameter of the SWNTs. The experimental results are explained by using density functional theory calculations through the energies of the coronene molecules inside the SWNTs, which depend on the orientation of the molecules and the diameter of the tubes.

Keyword
coronene, encapsulation, graphene, nanoribbons, nanotubes
National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-89582 (URN)10.1002/cphc.201301200 (DOI)000337521700018 ()
Available from: 2014-06-04 Created: 2014-06-04 Last updated: 2017-12-05Bibliographically approved
Vorobiev, A., Dennison, A., Chernyshov, D., Skyrpnychuck, V., Barbero, D. & Talyzin, A. (2014). Graphene oxide hydration and solvation: an in situ neutron reflectivity study. Nanoscale, 6(20), 12151-12156
Open this publication in new window or tab >>Graphene oxide hydration and solvation: an in situ neutron reflectivity study
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2014 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 6, no 20, p. 12151-12156Article in journal (Refereed) Published
Abstract [en]

Graphene oxide membranes were recently suggested for applications in separation of ethanol from water using a vapor permeation method. Using isotope contrast, neutron reflectivity was applied to evaluate the amounts of solvents intercalated into a membrane from pure and binary vapors and to evaluate the selectivity of the membrane permeation. Particularly, the effect of D2O, ethanol and D2O–ethanol vapours on graphene oxide (GO) thin films (25 nm) was studied. The interlayer spacing of GO and the amount of intercalated solvents were evaluated simultaneously as a function of vapour exposure duration. The significant difference in neutron scattering length density between D2O and ethanol allows distinguishing insertion of each component of the binary mixture into the GO structure. The amount of intercalated solvent at saturation corresponds to 1.4 molecules per formula unit for pure D2O (1.4 monolayers) and 0.45 molecules per formula unit (one monolayer) for pure ethanol. This amount is in addition to H2O absorbed at ambient humidity. Exposure of the GO film to ethanol–D2O vapours results in intercalation of GO with both solvents even for high ethanol concentration. A mixed D2O–ethanol layer inserted into the GO structure is water enriched compared to the composition of vapours due to slower ethanol diffusion into GO interlayers

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:umu:diva-96477 (URN)10.1039/c4nr03621b (DOI)000343000800070 ()25208613 (PubMedID)
Available from: 2014-11-21 Created: 2014-11-21 Last updated: 2017-12-05Bibliographically approved
Rezania, B., Severin, N., Talyzin, A. V. & Rabe, J. P. (2014). Hydration of bilayered graphene oxide. Nano letters (Print), 14(7), 3993-3998
Open this publication in new window or tab >>Hydration of bilayered graphene oxide
2014 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 14, no 7, p. 3993-3998Article in journal (Refereed) Published
Abstract [en]

The hydration of graphene oxide (GO) membranes is the key to understand their remarkable selectivity in permeation of water molecules and humidity-dependent gas separation. We investigated the hydration of single GO layers as a function of humidity using scanning force microscopy, and we determined the single interlayer distance from the step height of a single GO layer on top of one or two GO layers. This interlayer distance grows gradually by approximately 1 A upon a relative humidity (RH) increase in the range of 2 to similar to 80% and the immersion into liquid water increases the interlayer distance further by another 3 A. The gradual expansion of the single interlayer distance is in good agreement with the averaged distance measured by X-ray diffraction on multilayered graphite oxides, which is commonly explained with an interstratification model. However, our experimental design excludes effects connected to interstratification. Instead we determine directly if insertion of water into GO occurs strictly by monolayers or the thickness of GO layers changes gradually. We find that hydration with up to 80% RH is a continuous process of incorporation of water molecules into single GO layers, while liquid water inserts as monolayers. The similarity of hydration for our bilayer and previously reported multilayered materials implies GO few and even bilayers to be suitable for selective water transport.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014
Keyword
graphene oxide, graphene, hydration, scanning force microscopy
National Category
Chemical Sciences Nano Technology Materials Engineering Condensed Matter Physics
Identifiers
urn:nbn:se:umu:diva-91854 (URN)10.1021/nl5013689 (DOI)000338979700045 ()
Available from: 2014-08-26 Created: 2014-08-18 Last updated: 2017-12-05Bibliographically approved
Talyzin, A. V., Luzan, S., Anoshkin, I., Nasibulin, A., Esko, K., Dzwilewski, A., . . . Grennberg, H. (2014). Hydrogen-Driven Cage Unzipping of C60 into Nano-Graphenes. The Journal of Physical Chemistry C, 118(12), 6504-6513
Open this publication in new window or tab >>Hydrogen-Driven Cage Unzipping of C60 into Nano-Graphenes
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2014 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, no 12, p. 6504-6513Article in journal (Refereed) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014
National Category
Natural Sciences
Identifiers
urn:nbn:se:umu:diva-89580 (URN)10.1021/jp500377s (DOI)
Available from: 2014-06-04 Created: 2014-06-04 Last updated: 2017-12-05Bibliographically approved
Talyzin, A. V., Luzan, S., Anoshkin, I. V., Nasibulin, A. G., Kauppinnen, E. I., Dzwilewski, A., . . . Grennberg, H. (2014). Hydrogen-Driven Cage Unzipping of C-60 into Nano-Graphenes. The Journal of Physical Chemistry C, 118(12), 6504-6513
Open this publication in new window or tab >>Hydrogen-Driven Cage Unzipping of C-60 into Nano-Graphenes
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2014 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, no 12, p. 6504-6513Article in journal (Refereed) Published
Abstract [en]

Annealing of C-60 in hydrogen at temperatures above the stability limit of C H bonds in C60Hx (500-550 degrees C) is found to result in direct collapse of the cage structure, evaporation of light hydrocarbons, and formation of solid mixture composed of larger hydrocarbons and few-layered graphene sheets. Only a minor part of this mixture is soluble; this was analyzed using matrix-assisted laser desorption/ionization MS, Fourier transform infrared (FTIR), and nuclear magnetic resonance spectroscopy and found to be a rather complex mixture of hydrocarbon molecules composed of at least tens of different compounds. The sequence of most abundant peaks observed in MS, which corresponds to C2H2 mass difference, suggests a stepwise breakup of the fullerene cage into progressively smaller molecular fragments edge-terminated by hydrogen. A simple model of hydrogen-driven C-60 unzipping is proposed to explain the observed sequence of fragmentation products. The insoluble part of the product mixture consists of large planar polycyclic aromatic hydrocarbons, as evidenced by FTIR and Raman spectroscopy, and some larger sheets composed of few-layered graphene, as observed by transmission electron microscopy. Hydrogen annealing of C-60 thin films showed a thickness-dependent results with reaction products significantly different for the thinnest films compared to bulk powders. Hydrogen annealing of C-60 films with the thickness below 10 nm was found to result in formation of nanosized islands with Raman spectra very similar to the spectra of coronene oligomers and conductivity typical for graphene.

National Category
Physical Chemistry
Identifiers
urn:nbn:se:umu:diva-88396 (URN)10.1021/jp500377s (DOI)000333578300059 ()
Available from: 2014-05-20 Created: 2014-05-05 Last updated: 2018-03-15Bibliographically approved
Talyzin, A., Hausmaninger, T., You, S. & Szabo, T. (2014). The structure of graphene oxide membranes in liquid water, ethanol and water – ethanol mixtures. Nanoscale, 6, 272-281
Open this publication in new window or tab >>The structure of graphene oxide membranes in liquid water, ethanol and water – ethanol mixtures
2014 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 6, p. 272-281Article in journal (Refereed) Published
Abstract [en]

The structure of graphene oxide (GO) membranes was studied in situ in liquid solvents using synchrotron radiation X-ray diffraction in a broad temperature interval. GO membranes are hydrated by water similarly to precursor graphite oxide powders but intercalation of alcohols is strongly hindered, which explains why the GO membranes are permeated by water and not by ethanol. Insertion of ethanol into the membrane structure is limited to only one monolayer in the whole studied temperature range, in contrast to precursor graphite oxide powders, which are intercalated with up to two ethanol monolayers (Brodie) and four ethanol monolayers (Hummers). As a result, GO membranes demonstrate the absence of “negative thermal expansion” and phase transitions connected to insertion/de-insertion of alcohols upon temperature variations reported earlier for graphite oxide powders. Therefore, GO membranes are a distinct type of material with unique solvation properties compared to parent graphite oxides even if they are composed of the same graphene oxide flakes.

Place, publisher, year, edition, pages
RSC Publishing, 2014
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:umu:diva-82861 (URN)10.1039/c3nr04631a (DOI)000328673000030 ()24189605 (PubMedID)
Available from: 2013-11-12 Created: 2013-11-12 Last updated: 2018-02-12Bibliographically approved
Talyzin, A. (2013). Comment on "Laser controlled magnetism in hydrogenated fullerene films": [J. Appl. Phys. 109, 083941 (2011)]. Journal of Applied Physics, 113(3), 036101
Open this publication in new window or tab >>Comment on "Laser controlled magnetism in hydrogenated fullerene films": [J. Appl. Phys. 109, 083941 (2011)]
2013 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 113, no 3, p. 036101-Article in journal, Editorial material (Other academic) Published
Abstract [en]

Hydrogenation of C-60 films with formation of single hydrogen adduct reported by Makarova et al. [J. Appl. Phys. 109, 083941 (2011); Phys. Status Solidi B 246, 2778 (2009)] was supported only by several features found in Raman spectra of treated samples. However, no spectra were shown for untreated samples. Data shown in this comment prove that all Raman peaks assigned by Makarova et al. [J. Appl. Phys. 109, 083941 (2011); Phys. Status Solidi B 246, 2778 (2009)] to effects of hydrogenation can be found in spectra of pristine untreated commercial C-60 powder. These peaks represent some second order vibrations of C-60 as well as some possible solvent impurities. Therefore, all magnetic effects reported in this study should be assigned to unknown effects but not necessarily to hydrogenation. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4775821]

National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-66649 (URN)10.1063/1.4775821 (DOI)000313670600078 ()
Available from: 2013-03-05 Created: 2013-02-26 Last updated: 2017-12-06Bibliographically approved
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