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Abstract: A sensitive and selective molecularly imprinted electrochemical sensor for p-nitrophenol detection has been developed based on ZnO nanoparticles/multiwall carbon nanotubes (MWNTs)-chitosan (CTS) nanocomposite. This nanocomposite was dripped onto an indium tin oxide electrode and then imprinted sol-gel solution was electrodeposited onto the modified electrode to construct the proposed sensor. The morphologies and electrochemical behaviors of the imprinted sensor were characterized by scanning electron microscope, X-ray diffraction, electrochemical impedance spectroscopy, square wave voltammetry and cyclic voltammetry. The imprinted sensor displayed excellent selectivity towards the target molecule p-nitrophenol. Meanwhile, the introduced nanocomposite increased surface area and active sites for electron transfer, thus remarkably enhancing the sensitivity of the imprinted sensor. Under optimal conditions, the peak current was linear to p-nitrophenol concentration ranging from 1.0 x 10-8 to 2.0 x 10-4 mol L-1 with a detection limits of 1.0 x 10-9 mol L-1 (S/N = 3). This proposed sensor was applied to the detection of p-nitrophenol in various water samples successfully
Template and target information: p-nitrophenol
Author keywords: Imprinted thin films, electrochemical sensors, Multi-wall carbon nanotube, Zinc oxide, chitosan, p-nitrophenol, composites, cyclic voltammetry