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Interfacial capacitance of graphene oxide films electrodes
- 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 radiusThe 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.…
Author details: | Tatiana PessanhaORCiD, Waldemir J. PaschoalinoORCiD, Patricia B. DerocoORCiD, Sergio Kogikoski JuniorORCiD, Ana C. M. de Moraes, Cecilia de Carvalho Castro de SilvaORCiD, Lauro T. KubotaORCiD |
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DOI: | https://doi.org/10.1002/elan.202100220 |
ISSN: | 1521-4109 |
ISSN: | 1040-0397 |
Title of parent work (English): | Electroanalysis : an internatinal journal devoted to electroanalysis, sensors and bioelectronic devices |
Subtitle (English): | Fundamental studies on electrolytes interface aiming (bio)sensing applications |
Publisher: | Wiley-VCH |
Place of publishing: | Weinheim |
Publication type: | Article |
Language: | English |
Date of first publication: | 2021/06/23 |
Publication year: | 2022 |
Release date: | 2024/04/24 |
Tag: | Electrochemical impedance; Functional groups; Graphene derivates; Graphene oxide; Interfacial capacitance |
Volume: | 34 |
Issue: | 4 |
Number of pages: | 9 |
First page: | 692 |
Last Page: | 700 |
Funding institution: | National Institute of Science & Technology in Bioanalytics (INCTBio); National Council for Scientific and Technological Development (CNPq)Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) [303184/2019-1, 465389/2014-7, 434303/2016-0]; Sao Paulo Research Foundation (FAPESP), BrazilFundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2014/50867-3, 2013/22127-2, WJP 2017/05213-3, SKJr 2016/14507-8, PBD 2019/00166] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
Peer review: | Referiert |
Publishing method: | Open Access / Bronze Open-Access |