title: Enhancement of electrogenerated chemiluminescence of luminol by ascorbic acid at gold nanoparticle/graphene modified glassy carbon electrode.
abstract: Gold nanoparticle/graphene (GNP/GR) nanocomposite was one-pot synthesized from water soluble graphene and HAuCl₄ by hydrothermal method and characterized by TEM, Raman spectroscopy, XRD, XPS, UV-vis spectroscopy, and electrochemical impedance spectroscopy (EIS). Electrogenerated chemiluminescence (ECL) of luminol was investigated at the GNP/GR modified glassy carbon electrode (GNP/GR/GCE) and the GNP modified glassy carbon electrode (GNP/GCE) in aqueous solution respectively. The results revealed that one strong anodic ECL peak could be observed at ∼0.8 V at two modified electrodes compared with that at the bare electrode. The intensity of the anodic ECL at the GNP/GR/GCE is weaker than that at the GNP/GCE, which should be due to the synergic effect of the enhancing effect of gold nanoparticles and the inhibiting effect of graphene on anodic luminol ECL. One strong cathodic ECL peak located at ∼-0.8 V could be observed at the GNP/GR/GCE but not at the GNP/GCE, which should be result from the adsorbed oxygen at the graphene film. In the presence of ascorbic acid, the anodic ECL at the GNP/GR/GCE was enhanced more than 8-times, which is more apparent than that at the GNP/GCE. Whereas, the cathodic ECL peak was seriously inhibited at the GNP/GR/GCE. The enhanced ECL intensity at the GNP/GR/GCE varied linearly with the logarithm of ascorbic acid concentration in the range of 1.0 × 10(-8) to 1.0 × 10(-6)mol L(-1) with a detection limit of 1.0 × 10(-9) mol L(-1). The possible ECL mechanism was also discussed.
authors.affiliation: School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China. Electronic address: dongyp@ahut.edu.cn.
authors.forename: Yongping
authors.initials: Y
authors.lastname: Dong
authors.affiliation: School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Gao
authors.affiliation: School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, China.
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Chu
authors.affiliation: Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei 230026, China. Electronic address: chmwang@ustc.edu.cn.
authors.forename: Chengming
authors.initials: C
authors.lastname: Wang
mesh_terms: D001205:Ascorbic Acid / Q000032:analysis* / Q000737:chemistry; D058266:Dielectric Spectroscopy; D055664:Electrochemical Techniques / Q000295:instrumentation* / Q000379:methods; D004566:Electrodes; D004867:Equipment Design; D006046:Gold / Q000737:chemistry; D006108:Graphite / Q000737:chemistry; D057230:Limit of Detection; D008163:Luminescent Measurements / Q000379:methods*; D008165:Luminol / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013059:Spectrum Analysis, Raman; D014961:X-Ray Diffraction
chemical_list: D008165:Luminol; D006046:Gold; D006108:Graphite; D001205:Ascorbic Acid
keywords: Ascorbic acid; Electrogenerated chemiluminescence (ECL); Gold nanoparticle; Graphene; Luminol