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Synthesis and Characterization of Carbon Fiber Based Porous CNTs-RGO/BDD for Application as Microelectrodes

Published online by Cambridge University Press:  08 May 2017

Amanda Araújo Silva ,
Romário Araújo Pinheiro ,
Cláudia do Amaral Razzino ,
André Contin ,
Vladimir Jesus Trava-Airoldi  and
Evaldo José Corat
Amanda Araújo Silva*
Affiliation:
National Institute for Space Research, 1758, Astronautas Avenue, CEP: 12227-010 São José dos Campos, Brazil
Romário Araújo Pinheiro
Affiliation:
National Institute for Space Research, 1758, Astronautas Avenue, CEP: 12227-010 São José dos Campos, Brazil
Cláudia do Amaral Razzino
Affiliation:
University of the Valley of Paraíba, 2911, Shishima Hifumi Avenue, CEP: 12244-000 São José dos Campos, Brazil
André Contin
Affiliation:
National Institute for Space Research, 1758, Astronautas Avenue, CEP: 12227-010 São José dos Campos, Brazil
Vladimir Jesus Trava-Airoldi
Affiliation:
National Institute for Space Research, 1758, Astronautas Avenue, CEP: 12227-010 São José dos Campos, Brazil
Evaldo José Corat
Affiliation:
National Institute for Space Research, 1758, Astronautas Avenue, CEP: 12227-010 São José dos Campos, Brazil
*
*(Email: [email protected])
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Abstract

Microelectrodes have attracted great interest for electroanalysis because of their unique properties, such as nonlinear diffusion, increased rate of mass transport and reduced capacitance, which allows a fast response. In this work, we created a porous nanocomposite of boron doped diamond (BDD) deposited on carbon nanotubes – reduced graphene oxide (CNTs – RGO) by Hot Filament Chemical Vapor Deposition (HFCVD) technique. The resulting material yielded porous BDD microelectrodes. On the first step, we have grown the CNTs on carbon fiber (CF) surface by Thermal CVD in a tubular reactor. Camphor solution and Fe-Co were carbon and catalyst source, respectively. For exfoliation, CNTs were treated by hydrogen plasma and oxygen plasma. We applied a seeding solution containing nanodiamond dispersed in KCl aqueous solution. Diamond nanoparticles interact with oxygen-containing groups on CNTs, promoting an efficient seeding. We deposited BDD films in an HFCVD reactor using methane/hydrogen gas mixtures. For doping, a partial hydrogen flow bubbled in a closed vessel containing a solution of boron oxide dissolved in methanol. The microelectrodes were characterized by Raman Scattering Spectroscopy, Scanning Electron Microscopy with Field Emission Gun and Cyclic Voltammetry. The crystalline quality of CNTs and BDD doping level were studied by Raman analysis. SEM micrographs showed that nanocomposite presented high porosity. Electrochemical analysis showed that the deposition of BDD on CNTs-RGO increased the electrochemical response of the microelectrode. Besides, this electrode presented a low capacitive current in comparison with BDD grown on flat substrates. Further, the porous BDD nanocomposite showed itself to be promising in electroanalysis.

Keywords

diamondnanostructurechemical vapor deposition (CVD) (deposition)
Type
Articles
Information
MRS Advances , Volume 2 , Issue 41: Electronics, Magnetics and Photonics , 2017 , pp. 2247 - 2252
Copyright
Copyright © Materials Research Society 2017 

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