A disposable and low-cost laser-scribed graphene electrochemical sensor for simultaneous detection of hydroquinone, paracetamol and methylparaben

Author(s)

Kavai, Mathias Stahl ; de Lima, Lucas Felipe ; de Araujo, William Reis

• Document type: Journal article
• Source: Materials Letters; v. 330, p. 4-pg., 2023-01-01.

Abstract

A novel and inexpensive laser-scribed graphene (LSG) sensor using polyetherimide (PEI) substrate was fabricated using CO2 laser. The material was characterized by scanning electron microscopy (SEM), Raman spectroscopy, and electrochemical techniques, demonstrating a high porous carbonaceous material, which resulted in an electroactive area with 2.4-fold enhancement compared to geometric area and a high heterogeneous electron transfer rate constant (k degrees) of 3.20 x 10-2 cm/s for ferricyanide redox probe. As a proof of applicability, the LSG-PEI sensor was applied for simultaneous detection of hydroquinone (HQ), paracetamol (PA), and methylparaben (MP) emerging pollutants (EP) in tap water and natural (lake) water samples, providing recoveries between 93.1 % and 118 % with limits of detection of 9.42 x 10-8, 3.23 x 10-7, and 2.95 x 10-7 mol/L for HQ, PA, and MP, respectively. (AU)

• FAPESP's process: 18/08782-1 - Miniaturized and integrated chemical sensors: new fabrication platforms for biological, clinical and environmental applications
• Grantee: Mauro Bertotti
• Support Opportunities: Research Projects - Thematic Grants