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Klechikov, Alexey
Publications (2 of 2) Show all publications
Klechikov, A., Sun, J., Vorobiev, A. & Talyzin, A. V. (2018). Swelling of Thin Graphene Oxide Films Studied by in Situ Neutron Reflectivity. The Journal of Physical Chemistry C, 122(24), 13106-13116
Open this publication in new window or tab >>Swelling of Thin Graphene Oxide Films Studied by in Situ Neutron Reflectivity
2018 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 122, no 24, p. 13106-13116Article in journal (Refereed) Published
Abstract [en]

Permeation of multilayered graphene oxide (GO) membranes by polar solvents is known to correlate with their swelling properties and amount of sorbed solvent. However, quantitative estimation of sorption using standard (e.g., gravimetric) methods is technically challenging for few nanometers thick GO membranes/films exposed to solvent vapors. Neutron reflectivity (NR) was used here to evaluate the amount of solvents intercalated into the film which consists of only ∼31.5 layers of GO. Analysis of NR data recorded from the GO film exposed to vapors of polar solvents provides information about change of film thickness due to swelling, amount of intercalated solvent, and selectivity in sorption of solvents from binary mixtures. A quantitative study of GO film sorption was performed for D2O, d-methanol, ethanol, dimethyl sulfoxide (DMSO), acetonitrile, dimethylformamide (DMF), and acetone. Using isotopic contrast, we estimated selectivity in sorption of ethanol/d-methanol mixtures by the GO film. Estimation of sorption selectivity was also performed for D2O/DMF, D2O/DMSO, and D2O/acetonitrile binary mixtures. Sorption of polar solvents was compared for the thin GO film, micrometer thick free standing GO membranes, and graphite oxide powders.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
graphene, graphene oxide, swelling
National Category
Physical Chemistry
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-151273 (URN)10.1021/acs.jpcc.8b01616 (DOI)000436381600057 ()2-s2.0-85047617225 (Scopus ID)
Funder
EU, Horizon 2020
Available from: 2018-08-31 Created: 2018-08-31 Last updated: 2018-10-31Bibliographically approved
Klechikov, A., Sun, J., Hu, G., Zheng, M., Wågberg, T. & Talyzin, A. V. (2017). Graphene decorated with metal nanoparticles: Hydrogen sorption and related artefacts. Microporous and Mesoporous Materials, 250, 27-34
Open this publication in new window or tab >>Graphene decorated with metal nanoparticles: Hydrogen sorption and related artefacts
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2017 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 250, p. 27-34Article in journal (Refereed) Published
Abstract [en]

Hydrogen sorption by reduced graphene oxides (r-GO) is not found to increase after decoration with Pd and Pt nanoparticles. Treatments of metal decorated samples using annealing under hydrogen or air were tested as a method to create additional pores by effects of r-GO etching around nanoparticles. Increase of Specific Surface Area (SSA) was observed for some air annealed r-GO samples. However, the same treatments applied to activated r-GO samples with microporous nature and higher surface area result in breakup of structure and dramatic decrease of SSA. Our experiments have not revealed effects which could be attributed to spillover in hydrogen sorption on Pd or Pt decorated graphene. However, we report irreversible chemisorption of hydrogen for some samples which can be mistakenly assigned to spillover if the experiments are incomplete.

Keywords
Graphene, Hydrogen storage, Graphene oxide, Nanoparticles, Decoration
National Category
Materials Chemistry
Identifiers
urn:nbn:se:umu:diva-135589 (URN)10.1016/j.micromeso.2017.05.014 (DOI)000405045800004 ()
Funder
EU, Horizon 2020
Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2018-06-09Bibliographically approved
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