Nitrogen diffusion in graphene oxide and reduced graphene oxide foils

0547312 - ÚJF 2022 RIV GB eng J - Journal Article
Torrisi, L. - Cutroneo, Mariapompea - Torrisi, A. - Silipigni, L.
Nitrogen diffusion in graphene oxide and reduced graphene oxide foils.
Vacuum. Roč. 194, DEC (2021), č. článku 110632. ISSN 0042-207X. E-ISSN 1879-2715
R&D Projects: GA ČR GA19-02482S; GA MŠMT EF16_013/0001812
Research Infrastructure: CANAM II - 90056
Institutional support: RVO:61389005
Keywords : Graphene oxide * reduced Graphene oxide * Diffusion coefficient * Activation energy
OECD category: Nuclear physics
Impact factor: 4.110, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.vacuum.2021.110632

Measurements of nitrogen diffusion coefficient in graphene oxide (GO) and reduced graphene oxide (rGO) have been performed at different temperatures ranging between 21 degrees C and 101 degrees C. GO and rGO foils have been prepared as thin foils with 15 um in thickness, total surface of about 5 cm(2) and active diffusion surface of about 20 mm(2). The rGO foils have been obtained by thermal annealing at 170 degrees C for 30 min in air. The measured room temperature diffusion coefficients, of 3.43 x 10(-4) cm(2)/s for GO and 5.1 x 10(-4) cm(2)/s for rGO, and, at 101 degrees C, of 5.22 x 10(-4) cm(2)/s for GO and 10.7 x 10(-4) cm(2)/s for rGO, have been obtained with a simple experimental set-up measuring the gas pressure gradient applied to the two faces of the thin foils versus the time. The rGO foils show a significant increasing of the diffusion coefficients with respect to the pristine GO due to the removing of water and some functional oxygen groups which determines the aperture of nanochannels through which the N-2 gas diffuses. The thermal activation energy of nitrogen diffusion is evaluated for the two investigated materials. The experimental apparatus to measure the diffusion coefficients, the obtained results, their correlation with the graphene sheets structure and the comparison with the literature data are presented and discussed.
Permanent Link: http://hdl.handle.net/11104/0323575