Paper-based electrochemical sensors with reduced graphene nanoribbons for simultaneous detection of sulfamethoxazole and trimethoprim in water samples

Author(s)

Martins, Thiago S. ^[1] ; Bott-Neto, Jose L. ^[2] ; Oliveira, Jr., Osvaldo N. ^[2] ; Machado, Sergio A. S. ^[1]

Affiliation

^[1] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13560970 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13560970 Sao Paulo - Brazil

• Document type: Journal article
• Source: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 882, FEB 1 2021.
• Web of Science Citations: 1

Abstract

Failure to control the levels of emerging pollutants in water supply can affect the quality of human life, and this maybe mitigated with a low-cost, real-time monitoring system. Herein, we describe a paper-based fully printed electrochemical sensor with reduced graphene nanoribbons (rGNR) capable of detecting sulfamethoxazole (SMX) and trimethoprim (TMP) antibiotics simultaneously in real water samples. The electrodes were printed on parchment paper, which is environmentally friendly and has an efficient printing capacity. Deposition of rGNRs in the matrix was confirmed with Raman spectroscopy, transmission electron microscopy (TEM), and X-ray photoemission spectroscopy (XPS). Optimized sensing performance was obtained using an electrochemical treatment of the electrodes at neutral pH. The paper-based sensor displayed a linear response from 1 mu mol l-1 to 10 mu mol l-1 for both antibiotics, with detection limits of 0.09 mu mol l-1 and 0.04 mu mol l-1 for SMX and TMP, respectively. The sensor was reproducible, with an RSD below 5%,and selective for the antibiotics including in real samples, in a demonstration of its potential for realtime monitoring of water supply systems. <comment>Superscript/Subscript Available</comment (AU)

• FAPESP's process: 19/13514-9 - Electrochemical sensors with a matrix containing graphene quantum dots or nanoribbons for the detection of biomarkers
• Grantee: Jose Luiz Bott Neto
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis
• Grantee: Osvaldo Novais de Oliveira Junior
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/01777-5 - Manufacture of disposable electrochemical devices composed of hollow carbon nanospheres and carbon nanowires decorated with silver nanoparticles for the quantification of endocrine disruptors in supply water samples
• Grantee: Sergio Antonio Spinola Machado
• Support Opportunities: Regular Research Grants