title: Electrodeposited nitrogen-doped graphene/carbon nanotubes nanocomposite as enhancer for simultaneous and sensitive voltammetric determination of caffeine and vanillin.
abstract: A nitrogen-doped graphene/carbon nanotubes (NGR-NCNTs) nanocomposite was employed into the study of the electrochemical sensor via electrodeposition for the first time. The morphology and structure of NGR-NCNTs nanocomposite were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. Meanwhile, the electrochemical performance of the glassy carbon electrode (GCE) modified with electrodeposited NGR-NCNTs (ENGR-NCNTs/GCE) towards caffeine (CAF) and vanillin (VAN) determination was demonstrated by cyclic voltammetry (CV) and square wave voltammetry (SWV). Under optimal condition, ENGR-NCNTs/GCE exhibited a wide linearity of 0.06-50 μM for CAF and 0.01-10 μM for VAN with detection limits of 0.02 μM and 3.3×10(-3) μM, respectively. Furthermore, the application of the proposed sensor in food products was proven to be practical and reliable. The desirable results show that the ENGR-NCNTs nanocomposite has promising potential in electrocatalytic biosensor application.
authors.affiliation: Department of Chemistry, Shanghai University, Shanghai 200444, PR China.
authors.forename: Lin
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Department of Chemistry, Shanghai University, Shanghai 200444, PR China. Electronic address: wdingyp@sina.com.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Ding
authors.affiliation: Department of Chemistry, Shanghai University, Shanghai 200444, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Jiang
authors.affiliation: Department of Chemistry, Shanghai University, Shanghai 200444, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Chemistry, Shanghai University, Shanghai 200444, PR China.
authors.forename: Fan
authors.initials: F
authors.lastname: Mo
mesh_terms: D001547:Benzaldehydes / Q000032:analysis*; D002110:Caffeine / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon; D009584:Nitrogen / Q000737:chemistry*; D015203:Reproducibility of Results
chemical_list: D001547:Benzaldehydes; D037742:Nanotubes, Carbon; D002110:Caffeine; D006108:Graphite; C100058:vanillin; D009584:Nitrogen
keywords: Electrochemical sensor; Electrodeposition; Nitrogen-doped graphene/carbon nanotubes; Ultrasensitive