Electrochemistry of ZnO@reduced graphene oxides

Raman Spectroscopy vs Voltammetry: A Voltammetric Approach to Elucidate Different Chemicals in a Range of Pharmaceutical Tablets

“…The grey (---) line show the same experiment at CPE. The distinct slopes observed for different drugs is in agreement with the crucial role of structural and chemical properties on the electrode kinetics, in which diffusional and electronic limiting factors play different role [16,17].…”

“…Indeed, for all species to reach the electrode surface to undergo redox reactions, there is a dependence of the overpotential that is closely related to the reaction speed of the analyte. The reaction rate, in turn, is influenced by unique molecular characteristics of the compound that act by limiting or favoring the rate of dispersion for electroactive species in the reaction medium [16,17]. Therefore, when a compound has its mass-transfer controlled by diffusion and this is the limiting step of the reaction on a working electrode, the slope of the calibration curve (peak currents vs different concentrations) is connected to its the diffusion coefficient.…”

Detection of Sudan I in Foods by a MOF‐5/MWCNT Modified Electrode

“…[17][18][19] For example, Najafi et al [20] achieved the determination of Sudan I in the presence of bisphenol A using ZnO/CNTs/ionic liquid paste electrode. Elyasi et al [21] constructed a carbon paste electrode modified by Pt/CNTs nanocomposite ionic liquid to detect Sudan I. Hao et al [22] synthesized zinc oxide decorated reduced graphene nanocomposite which named ZnO@rGO composites and modified it on a glassy carbon electrode (GCE) for sensitive detection of Sudan I. These methods provide new ideas for us to better explore the better ways for the detection of Sudan I in foodstuffs.…”

Room-Temperature Reduction of Graphene Oxide in Water by Metal Chloride Hydrates: A Cleaner Approach for the Preparation of Graphene@Metal Hybrids

“…The presence of oxygen atoms and metal particles in the composite can change dramatically the physical, electronic and chemical properties of graphene-based devices [ 4 ]. GO@M/MO materials have shown great promises in various hi-tech application fields such as paramagnetic agents for magnetic resonance imaging (M = Fe) [ 6 , 7 , 8 ], capacitive electrodes for lithium batteries (M = Fe, Co, Sn) [ 9 , 10 ], supercapacitors (M = Cu, Ti, Mn) [ 11 , 12 , 13 , 14 ], photocatalysts (M = Ti, Sn, W) [ 15 , 16 , 17 , 18 , 19 , 20 ], electrocatalysts (M = Au, Pd, Pt) [ 21 , 22 , 23 ], catalysts for chemical transformation (M = Au, Pt) [ 24 , 25 ], electrodes (M = Ti, Zn) [ 26 , 27 ], conductive transparent films (M = Cu) [ 28 ], sensing [ 29 , 30 ] (M = Sn, Pd, Zn) [ 31 , 32 , 33 , 34 , 35 ], water remediation (M = Fe) [ 36 , 37 ], molecular separation [ 38 ] and antibacterial nanocomposites (M = Ag, Cu, Zn, Mn, Se) [ 39 , 40 ]. According to previous reports [ 41 ], C–OH on GO can easily react with metal cations to form C–O–M.…”

“…Several methods [ 1 , 2 ] are available to prepare GO@M/MO composites on a gram scale using the solution mixing method [ 42 ], the sol–gel method [ 43 ], the hydrothermal/solvothermal method under pressure and heat [ 38 ], by self-assembly [ 44 ] or conjugation [ 30 ] with preformed particles, by spontaneous redox reaction between metal and GO in solution [ 31 ] or by dry mechanomecanical metal reduction of GO [ 45 ]. When mixed together in solution, metal ions of different nature can be coprecipitated to form binary metals systems on GO [ 46 , 47 , 48 ].…”