Nitrite electrochemical sensing platform based on tin oxide films

Our work aims to develop a novel electrochemical sensing platform based on SnO2/Pt/Ti/SiO2/Si for selective nitrite detection. SnO2 coatings were prepared by classic sol-gel and microwave assisted sol-gel technique. In order to establish the best preparation conditions and electrocatalytic properties of the SnO2/Pt/Ti/SiO2/Si a complex investigation using X-ray diffraction (XRD), atomic force (AFM), scanning electron microscopy (SEM) as well as electrochemical methods like cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), differential pulse voltammetry (DPV) and chronoamperometry (CA) was accomplished. The proposed platform demonstrated high sensitivity, selectivity and good stability for nitrite detection being a proper tool in nitrite sensing in real samples. A linear response was obtained on concentration range between 10 and 400 mu M with the limits of detection and quantification of 1.7 (+/- 0.1) mu M and 5.6 (+/- 0.2) mu M, respectively.