Patterning (Electro)chemical Treatment-Free Electrodes with a 3D Printing Pen

Autor(es)

Pradela-Filho, Lauro A. A. ; Veloso, William B. B. ; Medeiros, Debora N. ; Lins, Renato S. O. ; Ferreira, Bruno ; Bertotti, Mauro ; Paixao, Thiago R. L. C.

• Tipo de documento: Artigo Científico
• Fonte: Analytical Chemistry; v. 95, n. 28, p. 10-pg., 2023-06-22.

Resumo

A simple fabrication method to make electrochemical sensorsisreported. The electrodes were fabricated with a commercial filamentbased on polylactic acid and carbon black (PLA/CB). They were engineeredwith a three-dimensional (3D) printing pen and poly(methyl methacrylate)template. The optimization parameters included the thickness and diametersof the electrodes. The electrode diameter was restricted by the 3Dprinting pen's nozzle dimension, and larger diameters generatedsmall cracks on the electrode surface, compromising their analyticalsignal. The electrode thickness can increase the electrical resistance,affecting their electrochemical response. The fabrication showed reproducibility(RSD = 4%). The electrode surface was easily renewed by sanding theelectrodes, making them reusable. Additionally, the proposed sensorprovided comparable electrochemical responses over traditional glassycarbon electrodes. Moreover, no (electro)chemical surface treatmentwas required for sensing applications due to the compromise betweenthe thickness and diameters of the electrodes, effectively translatingthe filaments' electrical properties to resulting materials.The electrodes' analytical performance was shown for organicand inorganic species, including paraquat, Pb2+, and caffeicacid. As proof of concept, the analytical applicability was demonstratedfor total polyphenolic quantification in tea samples. Therefore, thiswork provides an alternative to fabricating miniaturized electrodes,bringing valuable insights into PLA/CB 3D-printed sensors and openingpossibilities for designing electrode arrays. Moreover, the proposedelectrodes are promising platforms for paper-based microfluidic systems. (AU)

• Processo FAPESP: 21/00205-8 - Dispositivos analíticos miniaturizados e/ou microfluídicos para aplicações biológicas
• Beneficiário: Lauro Antonio Pradela Filho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/00811-5 - EMU concedido no processo 2018/08782-1: sistema para deposição de materiais por jato de tinta
• Beneficiário: Mauro Bertotti
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 18/08782-1 - Sensores químicos miniaturizados e integrados: novas plataformas de fabricação para aplicações biológicas, clínicas e ambientais
• Beneficiário: Mauro Bertotti
• Modalidade de apoio: Auxílio à Pesquisa - Temático