Low Temperature Physics: 39, 1090 (2013); https://doi.org/10.1063/1.4830421
Fizika Nizkikh Temperatur: Volume 39, Number 12 (December 2013), p. 1397-1404    ( to contents , go back )

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

A.V. Dolbin, V.B. Esel'son, V.G. Gavrilko, V.G. Manzhelii , N.A. Vinnikov, R.M. Basnukaeva, V.V. Danchuk, and N.S. Mysko

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: dolbin@ilt.kharkov.ua

E.V. Bulakh

Institute of Radio Astronomy of the National Academy of Sciences of Ukraine 4 Krasnoznamennaia Str., Kharkov 61002, Ukraine

W.K. Maser and A.M. Benito

Instituto de Carboquímica ICB-CSIC, 4 Miguel Luesma Castán, Zaragoza E-50018, Spain
pos Анотація:

Received July 10, 2013

Abstract

Sorption 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 temperature 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.

PACS: 68.43.Jk Diffusion of adsorbates, kinetics of coarsening and aggregation;
PACS: 68.43.Mn Adsorption kinetics.

Key words: graphene oxide, glucose-reduced graphene oxide, hydrazine-reduced graphene oxide, gas impurities, sorption, desorption, diffusion coefficients, tunneling.

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