Tuning electrical and thermoelectric properties of freestanding graphene oxide papers by carbon nanotubes and heat treatment

authors	Okhay, O; Goncalves, G; Dias, C; Ventura, J; Vieira, EMF; Goncalves, LMV; Tkach, A
nationality	International
journal	JOURNAL OF ALLOYS AND COMPOUNDS
author keywords	Graphene; Carbon nanotubes; Electrical conductivity; Seebeck coefficient; Nanocomposite
keywords	HYBRID FILMS; LARGE-AREA
abstract	Electrical conductivity and Seebeck coefficient of freestanding paper of graphene oxide (GO) and GO reduced by heat treatment at 180 degrees C (rGO) are tuned by addition of carbon nanotubes (CNT). The electrical conductivity of rGO with 50% of CNT is raised to similar to 2940 S/m from similar to 613 S/m for pure rGO or similar to 34 S/m for GO with 50% of CNT without reduction. Moreover, Seebeck coefficient of rGO increases with addition of CNT from -7.04 mu V/K for pure rGO to -20.82 mu V/K for rGO with 50% of CNT, presenting n-type conductivity. As result, calculated power factor PF is enhanced with increasing CNT concentration and the highest PF similar to 1.28 mu W/(K(2)m) is obtained for rGO with 50% of CNT. (C) 2018 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE SA
issn	0925-8388
isbn	1873-4669
year published	2019
volume	781
beginning page	196
ending page	200
digital object identifier (doi)	10.1016/j.jallcom.2018.12.033
web of science category	Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category	Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier	WOS:000457845900021