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


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.




Chemistry; Materials Science; Metallurgy & Metallurgical Engineering


Okhay, O; Goncalves, G; Dias, C; Ventura, J; Vieira, EMF; Goncalves, LMV; Tkach, A

nossos autores


O.O. and G.G. also thank Portuguese Foundation for Science and Technology (FCT) for the GrantsNo. SFRH/BPD/77704/2011 and SFRH/BPD/84419/2012, respectively, as well as UID/EMS/00481/2013-FCT and CENTRO-01-0145-FEDER-022083. C.D. is thankful to FCT for grant SFRH/BD/101661/2014. E.M.F.V. is grateful for financial support through the FCT grant SFRH/BPD/95905/2013. A.T. acknowledges funds by FEDER through Programa Operacional Factores de Competitividade - COMPETE and national funds through FCT within CICECO Project No. - FCOMP-01-0124-FEDER-037271 (FCT Ref. PEst-C/CTM/LA0011/2013) and independent researcher grant No. IF/00602/2013. Seebeck coefficient measurements were supported by FCT with the reference project UID/EEA/04436/2013, by FEDER funds through the COMPETE 2020 - Programa Operacional Competitividade e Internacionalizacao (POCI) with the reference project POCI-01-0145-FEDER-006941 and by the project PTDC/CTM - NAN/5414/2014 (POCI-01-0145-FEDER-016723). M Ferro is acknowledged for STEM analysis.

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