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Sorption of 4He, H2, Ne, N2, CH4 and Kr impurities in graphene oxide at low temperatures. Quantum effects

AuthorsDolbin, A. V.; Maser, Wolfgang K. ; Benito, Ana M.
KeywordsGraphene oxide
Glucose-reduced graphene oxide
Hydrazine-reduced graphene oxide
Gas impurities
Issue Date20-Dec-2013
PublisherAmerican Institute of Physics
CitationLow Temperature Physics 39(12): 1390-1395 (2013)
AbstractSorption and the subsequent desorption of 4He, H2, Ne, N2, CH4, and Kr gas impurities by graphene oxide(GO), glucose-reduced GO (RGO-Gl) and hydrazine-reduced GO (RGO-Hz) powders have been investigated in the temperature interval 2¿290 K. It has been found that the sorptive capacity of the reduced sample RGO-Hz is three to six times higher than that of GO. The reduction of GO with glucose has only a slight effect on its sorptive properties. The temperature dependences of the diffusion coefficients of the GO, RGO-Gl and RGO-Hz samples have been obtained using the measured characteristic times of sorption. It is assumed that the tempera-ture dependences of the diffusion coefficients are determined by the competition of the thermally activated and tunneling mechanisms, the tunneling contribution being dominant at low temperatures.
Publisher version (URL)http://dx.doi.org/10.1063/1.4830421
Identifiersdoi: 10.1063/1.4830421
issn: 1063-777X
e-issn: 1090-6517
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