Disposable carbon dots modified screen printed carbon electrode electrochemical sensor strip for selective detection of ferric ions

A disposable electrochemical sensor strip based on carbon nanodots (c-dots) modified screen printed carbon electrode (spce) was fabricated for selective detection of ferric ions (fe3+) in aqueous solution. c-dots of mean diameters within the range of 1-7 nm were synthesized electrochemically fromspent battery carbon rods.the analytical performance of this electrochemical sensor strip was characterized using cyclic voltammetry (cv) and electrochemical impedance spectroscopy (eis).the deposition ofc-dots had enhanced the electron-transfer kinetics and current intensity of the spce remarkably by 734% as compared to that of unmodified spce. under optimized conditions,the electrochemical sensor strip exhibited a linear detection range of 0.5 to 25.0 ppmfe3+ with a limit of detection (lod) of 0.44 ± 0.04 ppm (at s/n ratio = 3). validation of results by the electrochemical sensor strip was done by comparing analysis results obtained using an atomic absorption spectrometer (aas). copyright © 2017 shao chien tan et al.