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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.)

Glass varnish-based carbon conductive ink: A new way to produce disposable electrochemical sensors

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Pradel-Filho, Lauro A. [1, 2] ; Andreotti, Isabela A. A. [3] ; Carvalho, Jefferson H. S. [3] ; Araujo, Diele A. G. [1, 2] ; Orzari, Luiz O. [3] ; Gatti, Alexandre [3] ; Takeuchi, Regina M. [1, 2] ; Santos, Andre L. [1, 2] ; Janegitz, Bruno C. [3]
Total Authors: 9
[1] Univ Fed Uberlandia, Inst Chem, BR-38400902 Uberlandia, MG - Brazil
[2] Univ Fed Uberlandia, Inst Exact & Nat Sci Pontal, BR-38304402 Ituiutaba, MG - Brazil
[3] Univ Fed Sao Carlos, Dept Nat Sci Math & Educ, BR-13600970 Araras, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Web of Science Citations: 0

Nowadays, there is growing interest in portable and disposable electrochemical sensors due to the low-cost, simplicity, and excellent analytical performance associated with these devices. Despite recent advances, however, there remains a need to create cheap, high-performance electrode materials. Thus, this study evaluated the suitability of carbon conductive inks prepared by the mixture of glass varnish and graphite powder to produce disposable electrochemical sensors. Two different ink manufacturing processes and compositions were studied to produce different disposable electrodes, each providing high electrical conductivity and adhesion on paper and polyethylene terephthalate (PET) substrates. Electrochemical impedance spectroscopy, scanning electron microscopy, and Fourier-transform infrared spectroscopy were used for the characterization of inks. The electrodes were applied for the electrochemical determination of some compounds. For the paper electrode, the electrochemical detection of dopamine was performed, ranging from 15 mu mol to 100 mu mol L-1, with a detection limit of 4.1 mu mol L-1; the individual electrochemical detection of catechol was performed ranging from 10 mu mol L-1 to 1000 mu mol L-1, with a detection limit of 9.0 mu mol L-1. The detection of hydroquinone was performed, ranging from 10 mu mol L-1 to 1000 mu mol L-1, with a detection limit of 5.3 mu mol L-1. Also, the screen-printed electrode was applied for estriol electrochemical determination in the linear range from 0.1 mu mol L-1 to 8.0 mu mol L-1 with a detection limit of 0.08 mu mol L-1. The glass varnish is an alternative to creating carbon composite electrodes, and the new devices are inexpensive and simple to prepare, with attractive analytical performance. (AU)

FAPESP's process: 16/12697-4 - Nanostructured sensors modified with graphene and tapioca for determination of phenolics compounds and nitrogenous bases
Grantee:Luiz Otávio Orzari
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 17/21898-6 - New conductive devices for application in electrochemical sensing and biosensing
Grantee:Bruno Campos Janegitz
Support type: Regular Research Grants
FAPESP's process: 17/21097-3 - Bee-agriculture interactions: perspectives to sustainable use
Grantee:Osmar Malaspina
Support type: Research Projects - Thematic Grants
FAPESP's process: 19/04085-7 - Disposable and flexible sensors using polyethylene terephthalate (PET) and a new conductive ink for the detection of estriol in environmental and pharmaceutical samples
Grantee:Jefferson Henrique de Souza Carvalho
Support type: Scholarships in Brazil - Scientific Initiation