Band-like transport in high vacuum thermal reduced graphene oxide films

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00505694" target="_blank" >RIV/61389005:_____/19:00505694 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.vacuum.2019.04.025" target="_blank" >https://doi.org/10.1016/j.vacuum.2019.04.025</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.vacuum.2019.04.025" target="_blank" >10.1016/j.vacuum.2019.04.025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Band-like transport in high vacuum thermal reduced graphene oxide films

Popis výsledku v původním jazyce

Measurements of electrical conductivity were carried out at temperatures ranging between 77 K and 450 K on high vacuum thermal reduced graphene oxide (rGO) films. The investigated samples were characterized in composition and structure before being analyzed in terms of electrical conduction. Their electrical conductivity was also measured in air at room temperature. Measurements have demonstrated that at first graphene oxide (GO) was not stable both in air and vacuum. It stabilized after having been subjected to 7 thermal cycles under high vacuum conditions, about 10(-7) torr, up to a T-max of 450 K. At room temperature the initial GO material had a very low conductivity, of the order of 10(-10) Omega(-1) x cm(-1), which increased to about 2.5 Omega(-1) x cm(-1) when it was thermal stabilized in rGO. The stabilization process, induced by the high vacuum heating procedure, seems due to a good reduction of GO, which gives rise to such expansion of the conjugated pi-electron system that a band-like transport with small thermal activation energies (E-a = 10-50 meV) occurs. The performed electrical conductivity measurements are presented and discussed.

Název v anglickém jazyce

Band-like transport in high vacuum thermal reduced graphene oxide films

Popis výsledku anglicky

Measurements of electrical conductivity were carried out at temperatures ranging between 77 K and 450 K on high vacuum thermal reduced graphene oxide (rGO) films. The investigated samples were characterized in composition and structure before being analyzed in terms of electrical conduction. Their electrical conductivity was also measured in air at room temperature. Measurements have demonstrated that at first graphene oxide (GO) was not stable both in air and vacuum. It stabilized after having been subjected to 7 thermal cycles under high vacuum conditions, about 10(-7) torr, up to a T-max of 450 K. At room temperature the initial GO material had a very low conductivity, of the order of 10(-10) Omega(-1) x cm(-1), which increased to about 2.5 Omega(-1) x cm(-1) when it was thermal stabilized in rGO. The stabilization process, induced by the high vacuum heating procedure, seems due to a good reduction of GO, which gives rise to such expansion of the conjugated pi-electron system that a band-like transport with small thermal activation energies (E-a = 10-50 meV) occurs. The performed electrical conductivity measurements are presented and discussed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Vacuum

ISSN

0042-207X

e-ISSN

—

Svazek periodika

165

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

254-261

Kód UT WoS článku

000470047600036

EID výsledku v databázi Scopus

2-s2.0-85064620531