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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.)

Interfacial Capacitance of Graphene Oxide Films Electrodes: Fundamental Studies on Electrolytes Interface Aiming (Bio)Sensing Applications

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Author(s):
Pessanha, Tatiana M. [1] ; Paschoalino, Waldemir J. [1] ; Deroco, Patricia B. [1] ; Kogikoski, Sergio [1, 2] ; De Moraes, Ana C. M. [1, 3] ; Castro Silva, Cecilia Carvalho [4] ; Kubota, Lauro T. [1]
Total Authors: 7
Affiliation:
[1] Univ Estadual Campinas, Inst Chem, Dept Analyt Chem, POB 6154, BR-13084971 Campinas, SP - Brazil
[2] Univ Potsdam, Inst Chem, Phys Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam - Germany
[3] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 - USA
[4] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, BR-01302907 Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Electroanalysis; JUL 2021.
Web of Science Citations: 0
Abstract

The understanding of bidimensional materials dynamics and its electrolyte interface equilibrium, such as graphene oxide (GO), is critical for the development of a capacitive biosensing platform. The interfacial capacitance (C-i) of graphene-based materials may be tuned by experimental conditions such as pH optimization and cation size playing key roles at the enhancement of their capacitive properties allowing their application as novel capacitive biosensors. Here we reported a systematic study of C-i of multilayer GO films in different aqueous electrolytes employing electrochemical impedance spectroscopy for the application in a capacitive detection system. We demonstrated that the presence of ionizable oxygen-containing functional groups within multilayer GO film favors the interactions and the accumulation of cations in the structure of the electrodes enhancing the GO C-i in aqueous solutions, where at pH 7.0 (the best condition) the C-i was 340 mu F mg(-1) at -0.01 V vs Ag/AgCl. We also established that the hydrated cation radius affects the mobility and interaction with GO functional groups and it plays a critical role in the Ci, as demonstrated in the presence of different cations Na+=640 mu F mg(-1), Li+=575 mu F mg(-1) and TMA(+)=477 mu F mg(-1). As a proof-of-concept, the capacitive behaviour of GO was explored as biosensing platform for standard streptavidin-biotin systems. For this system, the C-i varied linearly with the log of the concentration of the targeting analyte in the range from 10 pg mL(-1) to 100 ng mL(-1), showing the promising applicability of capacitive GO based sensors for label-free biosensing. (AU)

FAPESP's process: 17/05213-3 - Investigation of the electrocatalytic activity of sensors based on graphene oxide decorated with Pt, Au or Ag nanoparticles by scanning electrochemical microscopy.
Grantee:Waldemir José Paschoalino Junior
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
Grantee:Lauro Tatsuo Kubota
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis
Grantee:Marco Aurelio Zezzi Arruda
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 16/14507-8 - Structural and Electrochemical Studies of Nanostructures films based on DNA
Grantee:Sergio Kogikoski Junior
Support Opportunities: Scholarships in Brazil - Post-Doctoral