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

• Published in: Materials letters 2023-01, Vol.330, p.133211, Article 133211
• Main Authors: Kavai, Mathias Stahl, de Lima, Lucas Felipe, de Araujo, William Reis
• Format: Article
• Language: English
• Subjects: Disposable device; Electrochemical sensor; Laser fabrication; Simultaneous detection
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2022.133211

[Display omitted] •A new disposable LSG sensor was fabricated using Polyetherimide substrate.•The LSG sensor presented high reproducibility, sensitivity, and selectivity.•The LSG sensor was applied for simultaneous detection of emerging pollutants.•A porous graphene-like material with high electrochemical performance was developed. 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°) of 3.20 × 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 × 10−8, 3.23 × 10−7, and 2.95 × 10−7 mol/L for HQ, PA, and MP, respectively.