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In-situ reduction by Joule heating and measurement of electrical conductivity of graphene oxide in a transmission electron microscope

AuthorsHettler, S.; Sebastián del Río, David ; Peláez-Fernández, Mario; Benito, Ana M. ; Maser, Wolfgang K. ; Arenal, Raúl
KeywordsTransmission electron microscopy
In-situ electrical measurements
Graphene oxide
Reduced graphene oxide
Joule heating
Microscopía electrónica de transmisión
Medidas eléctricas in-situ
Óxido de grafeno
Óxido de grafeno reducido
Calentamiento Joule
Issue Date6-Apr-2021
PublisherIOP Publishing
Citation2D Materials 8(3): 031001 (2021)
AbstractGraphene oxide (GO) is reduced by Joule heating using in-situ transmission electron microscopy (TEM). The approach allows the simultaneous study of GO conductivity by electrical measurements and of its composition and structural properties throughout the reduction process by TEM, electron diffraction and electron energy-loss spectroscopy. The small changes of GO properties observed at low applied electric currents are attributed to the promotion of diffusion processes. The actual reduction process starts from an applied power density of about 2 × 1014 Wm−3 and occurs in a highly uniform and localized manner. The conductivity increases more than 4 orders of magnitude reaching a value of 3 × 103 Sm−1 with a final O content of less than 1%. We discuss differences between the reduction by thermal annealing and Joule heating.
Description4 figures.-- Supporting information available on the website of the publisher.
Publisher version (URL)http://dx.doi.org/10.1088/2053-1583/abedc9
Appears in Collections:(INMA) Artículos
(ICB) Artículos
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