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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Silva, Amanda Araujo [1] ; Pinheiro, Romario Araujo [1] ; Razzino, Claudia do Amaral [2] ; Contin, Andre [1] ; Trava-Airoldi, Vladimir Jesus [1] ; Corat, Evaldo Jose [1]
Total Authors: 6
[1] Natl Inst Space Res, 1758 Astronautas Ave, BR-12227010 Sao Jose Dos Campos - Brazil
[2] Univ Valley Paraiba, 2911 Shishima Hifumi Ave, BR-12244000 Sao Jose Dos Campos - Brazil
Total Affiliations: 2
Document type: Journal article
Source: MRS ADVANCES; v. 2, n. 41, p. 2247-2252, 2017.
Web of Science Citations: 0

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. (AU)

FAPESP's process: 15/02960-7 - Optimization study of large electrochemical active area of nanocomposites VACNT-GO and its application in capacitive deionization
Grantee:Amanda Araujo Silva
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 12/15857-1 - Scientific studies and innovation application on CVD diamond, DLC and carbon nanostructures obtained by chemical vapor deposition technique
Grantee:Vladimir Jesus Trava-Airoldi
Support type: Research Projects - Thematic Grants