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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Band-like transport in high vacuum thermal reduced graphene oxide films
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10304 - Nuclear physics

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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