Your browser doesn't support javascript.
loading
3D-printed holder for drawing highly reproducible pencil-on-paper electrochemical devices.
Faustino, Lucas C; Cunha, João P C; Cantanhêde, Welter; Kubota, Lauro T; Gerôncio, Everson T S.
Afiliação
  • Faustino LC; Department of Chemistry, Federal University of Piauí - UFPI, Teresina, PI, 64049-550, Brazil.
  • Cunha JPC; Department of Chemistry, State University of Piauí - UESPI, Teresina, PI, 64002-150, Brazil.
  • Cantanhêde W; Department of Chemistry, Federal University of Piauí - UFPI, Teresina, PI, 64049-550, Brazil.
  • Kubota LT; Department of Analytical Chemistry, Institute of Chemistry, State University of Campinas - UNICAMP, Campinas, SP, 13084-971, Brazil.
  • Gerôncio ETS; Department of Chemistry, Federal University of Piauí - UFPI, Teresina, PI, 64049-550, Brazil. everson.thiago@ufpi.edu.br.
Mikrochim Acta ; 190(8): 338, 2023 Jul 31.
Article em En | MEDLINE | ID: mdl-37522993
Pencil drawing is one of the simplest and most cost-effective ways of fabricating miniaturized electrodes on a paper substrate. However, it is limited by the lack of reproducibility regarding the electrode drawing process. A 3D-printed pencil holder (3DPH) is proposed here for simple, reproducible, and low-cost hand-drawn fabrication of paper-based electrochemical devices. 3DPH was designed to keep pressure and angulation of the graphite mine constant on the paper substrate using a micromechanical pencil regardless of the user/operator. This approach significantly improved the reproducibility and cost of making reliable pencil-drawn electrodes. The results showed high reproducibility and accuracy of the 3DPH-assisted electrodes prepared by 4 different operators in terms of sheet resistance and electrochemical behavior. Cyclic voltammetric (CV) curves in the presence of [Fe(CN)6]3-/4- redox probe showed only 3.9% variation for the anodic peak currents of different electrodes prepared by different operators when compared with electrodes prepared without the 3D-printed support. SEM analyses revealed a more uniform graphite deposition/design of the electrodes prepared with 3DPH, which corroborates the results obtained by CV. As a proof of concept, 3DPH-assisted pencil-drawn graphite electrodes were employed for dopamine detection in synthetic saliva, showing a proportional increase in anodic peak current at 0.12 V vs. carbon pRE with increasing dopamine (DA) concentration, with a detection limit of 0.39µmol L-1. Moreover recovery was in the range 93-104% of DA (4-7% RSD) in synthetic saliva for three different concentrations, demonstrating the reliability of the approach. Finally, we believe this approach can make pencil-drawn technology more robust, accessible, reliable, and inexpensive for real on-site applications, especially in hard-to-reach locations or research centers with little investment.
Palavras-chave

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Mikrochim Acta Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Brasil País de publicação: Áustria

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Mikrochim Acta Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Brasil País de publicação: Áustria