Sensor de cobre por deposição a plasma para monitoramento eletroquímico de substâncias de relevância ambiental

Abstract

Recent studies in the area of electrochemistry have shown promising results in optimizing the quantification of chemical substances using electrochemical sensors. These sensors have proven to be efficient compared to conventional chemical quantification methods, offering high reproducibility, sensitivity and the possibility of on-site analysis. In this work, the production of an easy-to-produce flexible electrochemical sensor was developed, manufactured by deposition of copper metal on a polyvinyl chloride (PVC) substrate using the sputtering technique. The developed sensor was electrochemically characterized using voltammetry techniques, using the ferrocyanide/potassium ferricyanide redox couple, demonstrating that the electrode meets the expected voltammetric profiles, analytical sensitivity and stability. The data obtained showed that the electrode produced presents attractive results and can be used as an electrochemical sensor. The use of this technique to produce sensors presents an innovative approach with potential in the development of analytical devices and a sustainable alternative. Finally, studies were carried out on the use of copper electrodes in electroanalytical applications, with the aim of investigating the feasibility of using the sensor to detect analytes of chemical interest. The application of the sensor for the detection of Glyphosate, a herbicide widely used in several crops, was carried out by means of electrochemical techniques in a PBS buffer medium 0.1 mol L–1 as a supporting electrolyte, obtaining in the best conditions a linear range of 2.0 – 4.0 μmol L–1, with a detection limit of 0.27 μmol L–1. Thus, it is expected that the presented technique will aid in the development of new sensors with low cost and benefits for society.