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

Author(s)

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]

Affiliation

^[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

• Document type: Journal article
• Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 305, FEB 15 2020.
• Web of Science Citations: 0

Abstract

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 Opportunities: 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 Opportunities: Regular Research Grants
• FAPESP's process: 17/21097-3 - Bee-agriculture interactions: perspectives to sustainable use
• Grantee: Osmar Malaspina
• Support Opportunities: BIOTA-FAPESP Program - 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 Opportunities: Scholarships in Brazil - Scientific Initiation