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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.)

Reactive oxygen plasma treatment of 3D-printed carbon electrodes towards high-performance electrochemical sensors

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Author(s):
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Pereira, Jian F. S. [1] ; Rocha, Raquel G. [1] ; Castro, Silvia V. F. [1] ; Joao, Afonso F. [1, 2] ; Borges, Pedro H. S. [1] ; Rocha, Diego P. [3, 1] ; de Siervo, Abner [4] ; Richter, Eduardo M. [1] ; Nossol, Edson [1] ; Gelamo, V, Rogerio ; Munoz, Rodrigo A. A. [1]
Total Authors: 11
Affiliation:
[1] Univ Fed Uberlandia, Inst Chem, BR-38408100 Uberlandia, MG - Brazil
[2] Pungue Univ, Dept Math & Nat Sci, Chimoio - Mozambique
[3] Univ Sao Paulo, Inst Chem, BR-05508000 Sao Paulo, SP - Brazil
[4] Univ Estadual Campinas, Inst Phys Gleb Wataghin, Appl Phys Dept, BR-13083859 Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 347, NOV 15 2021.
Web of Science Citations: 0
Abstract

Conductive 3D-printed platforms have been recognized an emerging class of materials with great potential to electrochemistry. However, such 3D-printed electrodes require a surface treatment to remove excess of polymer that hinders the electron transfer. We report a fast (2-min) and chemical-free protocol for the surface treatment of 3D-printed conductive electrodes based on reactive cold oxygen plasma. A dramatic improvement of electrochemical activity of 3D-printed carbon black-polylactic acid (CB-PLA) electrodes was verified by the decrease in the peak-to-peak separation of the voltammetric response for the {[}Fe(CN)(6)](3-)/{[}Fe(CN)(6)](4-) couple and in the resistance of change transfer. The O-2 plasma treatment increased oxide groups and graphitic groups at the CB-PLA surface (verified by XPS) and provided higher rugosity (SEM images) thus higher exposure of conducting carbon sites and increased electroactive area in comparison with CO2-plasma, which explains the improved electrochemical performance using O-2-plasma treated electrodes. This protocol is faster and provided improved electrochemical activity compared with electrochemical, chemical, or biological treatments. As proofs-of concept, the benefits of surface plasma treatment of the 3D-printed electrodes were demonstrated towards the electrochemical sensing of dopamine and nitrite, molecules of biological interest, including the analysis of human saliva. Values of sensitivity and detection limit were greatly improved when using O-2 plasma treatment for both molecules (up to 100-fold increase in sensitivity for the voltammetric detection of dopamine), suggesting great promises for the development of highly-sensitive electrochemical sensors. (AU)

FAPESP's process: 20/00325-0 - Production of conductive filaments containing carbon nanomaterials and metal nanoparticles for the development of low cost enzymeless electrochemical biosensors via additive manufacturing
Grantee:Diego Pessoa Rocha
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 07/08244-5 - Study of the magnetic properties of Pd and PdAu ultrathin films and nanoparticles by using XMCD
Grantee:Abner de Siervo
Support Opportunities: Regular Research Grants
FAPESP's process: 07/54829-5 - Electronic and geometric structure of nano-materials: synchrotron radiation studies
Grantee:Richard Landers
Support Opportunities: Research Projects - Thematic Grants