Thermoplastic Starch and Graphite Biocomposite Electrode for Electrochemical Catechol Sensor

Author(s)

de Freitas, Amanda de S. M. ; Maciel, Cristiane C. ; Lemes, Ana Paula ; Ferreira, Marystela

• Document type: Journal article
• Source: ECS ADVANCES; v. 1, n. 3, p. 7-pg., 2022-09-01.

Abstract

There is interest in obtaining alternative materials for application in electrochemical sensing. Thermoplastic starch (TPS) was used because it is a polymer with high availability and biodegradability, which can be incorporated into graphite (Gr) forming a conductive material. This work describes the characterization of the material produced by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), contact angle, X-ray diffraction (XRD) and Raman spectroscopy. The techniques used allowed to show a good interaction between graphite and TPS and confirmed the predicted conductive properties, showing the potential of application as a substrate, in the development of electrochemical sensors. Electrochemical characterization by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) was also carried out, which allowed defining the best proportion of graphite:TPS as the composite of 60:40 w/w. The technique of differential pulse voltammetry (DPV) was used to determine the catechol molecule over a range of 0.1 to 2.0 mmol l-1, showing a linear regression (R2) of 0.9996 and limit of detection (LOD) and limit of quantitation (LOQ) values equal to 1.85 x 10-6 mol l-1 and 6.18 x 10-7 mol l-1, respectively. The results showed good precision, selectivity, and stability, proving the application as an electrochemical sensor to detect catechol (CC) in contaminated water. (AU)

• FAPESP's process: 19/15976-0 - Biodegradation as treatment proposal and recovery of carbon nanotubes arising from residues of biodegradable polymeric nanocomposites
• Grantee: Ana Paula Lemes
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/50869-6 - INCT 2014: on Organic Electronics
• Grantee: Roberto Mendonça Faria
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 20/12659-0 - Poly (butylene adipate-co-terephthalate) (PBAT) and carbon materials composite used in the development of flexible and biodegradable electrochemical devices
• Grantee: Marystela Ferreira
• Support Opportunities: Regular Research Grants