Cu^(2+)is a bio-accumulative and toxic environmental pollutant,so its sensitive and selective detection is of great importance.In this work,gold nanoparticles were electrochemically deposited on fluorine-doped tin oxi...Cu^(2+)is a bio-accumulative and toxic environmental pollutant,so its sensitive and selective detection is of great importance.In this work,gold nanoparticles were electrochemically deposited on fluorine-doped tin oxide and characterized by scanning electron microscope and cyclic voltammetry.4-Mercaptobenzoic acid(4-MBA),which contained carboxyl chelator,was self-assembled on the surface of gold nanoparticles through S-Au bond.The strong chelation of Cu^(2+)with 4-MBA formed a stable Cu^(2+)-4-MBA complex,which was confirmed by energy-dispersive X-ray spectroscopy.Square wave voltammetry was applied to determine the concentration of Cu^(2+).Under optimized condition,the oxidation peak current was proportional to the concentration of Cu^(2+)in the range of 10-1500 nM with limit detection of 8 nM.The proposed electrochemical sensor showed excellent selectivity towards Cu^(2+).In addition,the applicability of the developed sensor was evaluated by determin-ing the concentrations of Cu^(2+)in river water samples,which were consistent with the results of inductively coupled plasma mass spectroscopy.展开更多
基金This research is supported by the National Natural Science Foundation of China(Nos.61571278,61571280).
文摘Cu^(2+)is a bio-accumulative and toxic environmental pollutant,so its sensitive and selective detection is of great importance.In this work,gold nanoparticles were electrochemically deposited on fluorine-doped tin oxide and characterized by scanning electron microscope and cyclic voltammetry.4-Mercaptobenzoic acid(4-MBA),which contained carboxyl chelator,was self-assembled on the surface of gold nanoparticles through S-Au bond.The strong chelation of Cu^(2+)with 4-MBA formed a stable Cu^(2+)-4-MBA complex,which was confirmed by energy-dispersive X-ray spectroscopy.Square wave voltammetry was applied to determine the concentration of Cu^(2+).Under optimized condition,the oxidation peak current was proportional to the concentration of Cu^(2+)in the range of 10-1500 nM with limit detection of 8 nM.The proposed electrochemical sensor showed excellent selectivity towards Cu^(2+).In addition,the applicability of the developed sensor was evaluated by determin-ing the concentrations of Cu^(2+)in river water samples,which were consistent with the results of inductively coupled plasma mass spectroscopy.
