Masoud Taleb; Irina Hussainova; Roman Ivanov; Iwona Jasiuk
Abstract
The present study reports the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA) in 0.1 M phosphate buffer solution (pH = 7.0) using a novel electrode material prepared from oxide ceramic nanofibers by applying a single step chemical vapor deposition method. Electron-transfer ...
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The present study reports the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA) in 0.1 M phosphate buffer solution (pH = 7.0) using a novel electrode material prepared from oxide ceramic nanofibers by applying a single step chemical vapor deposition method. Electron-transfer kinetics at the electrode/solution interface was studied by standard redox reaction of 5 mM Fe(CN)6 3-/4- in 1 M KCl. Electrochemical and sensing measurements such as cyclic voltammetry and differential pulse voltammetry were performed to detect DA and UA in the presence of AA. The developed electrode was shown to separate the overlapping voltammetric responses of three analytes into the individual voltammetric peaks, totally eliminate the interference from AA, and distinguish DA from UA. Linear relationship was observed between current intensities and concentrations of all three compounds, and the limits of detection (LOD) were reached 0.57 µM, 0.77 µM and 0.84 µM for DA, UA and AA, respectively. The electrode of graphenated nanofibers displayed a very good reproducibility and stability, and was successfully tested for detection of DA, UA and AA in real urine samples.
Mete Bakir; Iwona Jasiuk
Abstract
Covetics are a novel class of metal-carbon nanomaterials. The covetics are fabricated using a conventional induction furnace wherein an electric current is applied into an activated carbon infused molten metal medium. In situ generated arc discharge induces a chemical conversion reaction where the amorphous ...
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Covetics are a novel class of metal-carbon nanomaterials. The covetics are fabricated using a conventional induction furnace wherein an electric current is applied into an activated carbon infused molten metal medium. In situ generated arc discharge induces a chemical conversion reaction where the amorphous carbon attains a crystalline structure and forms covalent bonding with host metal matrix. Such fabrication approach also promotes higher carbon solubility in the molten metal than that in traditional metal-carbon alloys. Nanoscale structure analyses revealed single-phase carbon-metal lattice morphologies in the covetics. The covetics have also been shown to possess improved thermos-physical properties as compared to their parent metals. We herein present a review of the literature on the covetics. First, we introduce the covetic materials, and then provide a brief overview on metal-carbon nanocomposites. Then, we summarize experimental results on covetics. Finally, we discuss characterization challenges and future directions in the covetics research.
