Enhanced performance of pencil-drawn paper-based electrodes by laser-scribing treatment

Autor(es)

Ataide, Vanessa N. ^[1] ; Ameku, Wilson A. ^[1] ; Bacil, Raphael R. ^[1] ; Angnes, Lucio ^[1] ; de Araujo, William R. ^[2] ; Paixao, Thiago R. L. C. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo Univ USP, Inst Chem, Dept Fundamental Chem, BR-05508900 Sao Paulo, SP - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Inst Chem, Dept Analyt Chem, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RSC ADVANCES; v. 11, n. 3, p. 1644-1653, JAN 13 2021.
• Citações Web of Science: 0

Resumo

Electrochemical Paper-based Analytical Devices (ePADs) are an alternative to traditional portable analytical techniques due to features such as low-cost, easy surface modification with different materials, and high sensitivity. A fast and simple method to fabricate enhanced ePADs using pencil-drawing which involves the CO2 laser treatment of the carbon surface deposited on paper is described. The electrochemical performances of the devices were evaluated using cyclic voltammetry (CV) with different redox probes and electrochemical impedance spectroscopy (EIS). The electrochemical results show that a treated surface presents a lower resistance to charge transfer and changes the approach of the probe and the overlap of its orbitals with the electrode. To investigate the effects of the laser treatment process, chemical and structural characteristics were evaluated using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. These results indicated that laser treatment promoted the restoration of carbon-carbon double bonds and removed a thin layer of nanodebris present in commercial pencils, resulting in an improvement of the electrochemical kinetics. As a proof-of-concept, the Pencil-Drawing Electrode (PDE) was used for the detection and quantification of furosemide (FUR) in a sample of synthetic urine, exhibiting a limit of detection (LOD) of 2.4 x 10(-7) mol L-1. The percentages of recovery of the FUR added to the samples A and B were 95% and 110%, respectively. The analysis using CO2 laser-treated PDE resulted in a fast, simple, and reliable method for this doping agent. (AU)

• Processo FAPESP: 18/14462-0 - Fabricação de dispositivos eletroquímicos em papel visando à aplicação em amostras de interesse clínico e ambiental
• Beneficiário: Vanessa Neiva de Ataide
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/21070-5 - Espectroscopia vibracional com resolução espacial
• Beneficiário: Mauro Carlos Costa Ribeiro
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• 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
• Processo FAPESP: 16/16477-9 - Fabricação de dispositivos analíticos portáteis baseados em plataformas de papel com sistema de detecção eletroquímica e colorimétrica visando aplicações forenses, clínicas e ambientais
• Beneficiário: William Reis de Araujo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/10522-5 - Desenvolvimento de métodos alternativos para fabricação de sensores eletroquímicos em papel
• Beneficiário: Thiago Regis Longo Cesar da Paixão
• Modalidade de apoio: Auxílio à Pesquisa - Regular