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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.)

Comparison of activation processes for 3D printed PLA-graphene electrodes: electrochemical properties and application for sensing of dopamine

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Kalinke, Cristiane [1] ; Neumsteir, Naile Vacilotto [1] ; Aparecido, Gabriel de Oliveira [1] ; de Barros Ferraz, Thiago Vasconcelos [1] ; dos Santos, Pamyla Layene [1] ; Janegitz, Bruno Campos [2] ; Bonacin, Juliano Alves [1]
Total Authors: 7
[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Nat Sci Math & Educ, BR-13600970 Araras, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ANALYST; v. 145, n. 4, p. 1207-1218, FEB 21 2020.
Web of Science Citations: 0

This paper reports the comparison of the electrochemical properties of 3D PLA-graphene electrodes (PLA-G) under different activation conditions and through different processes. In this work, the performance of the electrodes was evaluated after polishing, electrochemical and chemical treatments and a combination of them. The best results were obtained with hydroxide activation using 1.0 mol L-1 NaOH for 30 min of immersion, which promoted the saponification of PLA exposing the graphene nanoribbon structures. The improvement was more evident also after electrochemical activation, which led to a great increase in surface area, defects, electron transfer rate and amount of edge sites. The analytical performance of the proposed PLA-G(NaOH-30-EC) electrode was evaluated in the presence of dopamine (DA) by three electrochemical techniques, presenting a broad linear range, and limits of detection of 3.49, 2.17 and 1.67 mu mol L-1 were obtained by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and square wave voltammetry (SWV), respectively. The separation and quantification of DA in the presence of AA and UA was also reported. The sensor showed good repeatability and reproducibility and was successfully applied to DA determination in synthetic urine and human serum, showing good recovery, from 88.8 to 98.4%. Therefore, the activation methods were essential for the improvement in the 3D PLA-G electrode properties, allowing graphene surface alteration and electrochemical enhancement in the sensing of molecular targets. (AU)

FAPESP's process: 17/23960-0 - Study of the mechanism of water oxidation by catalysts operating at pH7 and its incorporation in electrodes printed in 3D
Grantee:Juliano Alves Bonacin
Support type: Regular Research Grants
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: BIOTA-FAPESP Program - Thematic Grants
FAPESP's process: 19/00473-2 - Development of 3-dimensional (3D) printed electrochemical biosensors with PLA polymer and graphene for the determination of biomolecules and diagnosis of diseases
Grantee:Cristiane Kalinke
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
Grantee:Lauro Tatsuo Kubota
Support type: Research Projects - Thematic Grants