Nitrogen diffusion in graphene oxide and reduced graphene oxide foils

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F21%3A00547312" target="_blank" >RIV/61389005:_____/21:00547312 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.vacuum.2021.110632" target="_blank" >https://doi.org/10.1016/j.vacuum.2021.110632</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.vacuum.2021.110632" target="_blank" >10.1016/j.vacuum.2021.110632</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Nitrogen diffusion in graphene oxide and reduced graphene oxide foils

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Nitrogen diffusion in graphene oxide and reduced graphene oxide foils

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Vacuum

ISSN

0042-207X

e-ISSN

1879-2715

Svazek periodika

194

Číslo periodika v rámci svazku

DEC

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

110632

Kód UT WoS článku

000706061600004

EID výsledku v databázi Scopus

2-s2.0-85116015296