title: A flower-like nickel oxide nanostructure: synthesis and application for choline sensing.
abstract: Flower-like nickel oxide nanostructure was synthesized by a simple desolvation method. The nanostructure was then employed as the modifier of a carbon paste electrode to fabricate a choline sensor. The mechanism and kinetics of the electrocatalytic oxidation of choline on the modified electrode surface were studied by cyclic voltammetry, steady-state polarization curve, and chronoamperometry. The catalytic rate constant and the charge transfer coefficient of the choline electrooxidation process by an active nickel species, and the diffusion coefficient of choline were reported. An amperometric method was developed for determination of choline with a sensitivity of 60.5 mA mol(-1)Lcm(-2) and a limit of detection of 25.4 μmol L(-1). The sensor had the advantages of high electrocatalytic activity and sensitivity, and long-term stability toward choline, with a simple fabrication method without complications of immobilization steps and using any enzyme or reagent.
authors.affiliation: Pharmaceutical Science Research Center, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Medical Physics, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Nanomedicine, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: N
authors.initials: N
authors.lastname: Sattarahmady
authors.affiliation: Nanomedicine and Nanobiology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Medical Physics, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Nanomedicine, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran. Electronic address: hheli7@yahoo.com.
authors.forename: H
authors.initials: H
authors.lastname: Heli
authors.affiliation: Nanomedicine and Nanobiology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Medical Physics, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: R
authors.initials: R
authors.lastname: Dehdari Vais
mesh_terms: D002384:Catalysis; D002794:Choline / Q000032:analysis*; D004566:Electrodes; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D033362:Powder Diffraction
chemical_list: D009532:Nickel; C028007:nickel monoxide; D002794:Choline
keywords: Choline; Electrocatalysis; Flower-like nanostructure; Nanobiosensor; Nickel oxide