文獻名：Electrochemical detection of nitrate ions via reduction of NO2− and oxidation of NO reactions based on Cu@ TiO2 coreshell/nafion/polyalizarin immobilized electrode

作者： Nader Amini^a, Afshin Maleki^a, Paria Maleki^b

^aEnvironmental Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran

^bDepartment of Biomedical Engineering, Hamedan University of Technology, Hamedan, Iran

摘要：In this paper, we synthesized Cu nanoparticles and Cu@TiO₂ core–shell. Regarding the characterization of the Cu nanoparticles and Cu₂O@C core–shell, the transmission electron microscopy (TEM), ultraviolet (UV) absorption spectrum, dynamic light scattering (DLS) and zeta potential techniques were employed. The Cu@ TiO₂ core–shell with conductive polymers such as Nafion (Nf) and Polyalizarin yellowe R (PAR) immobilizing on glassy carbon electrode (Cu@TiO₂-Nf/PAR/GCE). This was used for fabrication of an original electrochemical sensor to measurement nitrate via reduction of NO₂⁻ and oxidation of NO reactions. Cyclic voltammetry and impedimetric techniques were employed to confirm the novel sensor construction. Other electrochemical analysis was done by cyclic voltammetry and differential pulse voltammetry methods. The results shed lights on the matter that, Cu@TiO₂-Nf/PAR/GCE composite has a great electrocatalytic effect for detecting and determining nitrate ion at −0.8V(Red2) and 0.9V(OX). Linear range, sensitivity and limit of detection were calculated for two area potentials.

關鍵詞：Nitrate;Cu@TiO₂ coreshell;Polyalizarin;Nafion;Sensor