Modulating the Electrochemical Response of Eco-Friendly Laser-Pyrolyzed Paper Sensors Applied to Nitrite Determination

Author(s)

Gongoni, Juliana L. M. ; Filho, Lauro A. P. ; De Farias, Davi M. ; Arantes, Iana V. S. ; Paixao, Thiago R. L. C.

• Document type: Journal article
• Source: CHEMELECTROCHEM; v. 10, n. 1, p. 8-pg., 2022-12-21.

Abstract

Miniaturized paper-based electrochemical sensors were fabricated using kraft paper and CO2 laser, dispensing the need for chemical reagents and controlled atmospheric conditions. This study initially evaluated the paper type and laser processing parameters, enhancing the electrodes' robustness, electrochemical response, and electrical resistance. The sensors were also treated by applying -1 V for 60 s in 1.0 molL(-1) KCl, which is a simple and rapid procedure. The electrochemical treatment increased the electroactive area and roughness, confirmed by scanning electron microscopy. These aspects helped modulate the sensors' electrochemical response for nitrite determination, improving selectivity and sensitivity for this compound. The sensors also showed repeatability and batch-to-batch reproducibility, with 2.2 and 10% RSD, respectively. Therefore, this work brings a protocol to fabricating competitive electrochemical sensors through a sustainable strategy, opening possibilities for designing new analytical systems. (AU)

• FAPESP's process: 19/15065-7 - Development of paper-based electrochemical systems aiming flow analysis of forensic samples
• Grantee: Iana Vitória Spadini Arantes
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 21/00205-8 - Miniaturized and/or microfluidic analytical devices for biological applications
• Grantee: Lauro Antonio Pradela Filho
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/00811-5 - EMU granted in process 2018/08782-1: materials deposition system by ink-jet
• Grantee: Mauro Bertotti
• Support Opportunities: Multi-user Equipment Program