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Ding Y.,Materials and Biomolecular Engineering | Wang Y.,Materials and Biomolecular Engineering | Su L.,Materials and Biomolecular Engineering | Zhang H.,University of Connecticut | Lei Y.,Materials and Biomolecular Engineering
Journal of Materials Chemistry | Year: 2010

Following a facile two-step synthesis route, NiO-Ag hybrid nanofibers, NiO nanofibers, and porous Ag were prepared. Scanning electron microscopy and transmission electron microscopy were employed to characterize the morphology of the as-prepared samples. Fourier transform infrared spectroscopy was used to confirm the complete degradation of the polymer matrix and the conversion of metal salts to metal oxides. X-Ray diffraction and X-ray photoelectron spectroscopy were performed to investigate the crystal structures and compositions of the final products. The as-prepared samples were then applied to construct non-enzymatic sensors for glucose detection. The NiO-Ag hybrid nanofiber-based sensor shows much higher sensitivity, lower detection limit and wider linear range in glucose detection compared to the NiO nanofibers or the porous Ag based sensor. A synergistic effect was achieved between NiO and Ag. High selectivity against uric acid and ascorbic acid was also achieved from the NiO-Ag nanofibers and NiO nanofiber-based sensors at an applied potential of 0.6 V. A mechanism of the excellent selectivity was proposed for the first time. The application of NiO-Ag nanofibers for selective glucose detection was also demonstrated using human serum sample, and the result is in good agreement with that of commercial glucose meter. The excellent performance of the developed inorganic nanofiber-based glucose sensor, combined with good reproducibility, low cost and inherent stability of inorganic materials, indicates great commercial value in clinical diagnosis of diabetes. © 2010 The Royal Society of Chemistry. Source


Ding Y.,Materials and Biomolecular Engineering | Wang Y.,Materials and Biomolecular Engineering | Zhang L.,University of Connecticut | Zhang H.,University of Connecticut | Lei Y.,Materials and Biomolecular Engineering
Journal of Materials Chemistry | Year: 2012

In this work, novel NiO-CdO composite nanofibers with excellent conductivity and electrocatalytic property are reported. The hybrid nanofibers are fabricated by a facile two-step synthetic route consisting of electrospinning and subsequent calcination at 500 °C. EDX element mapping indicates the homogeneous distribution of CdO and NiO along the hybrid nanofiber. The incorporation of CdO into the NiO nanofibers is found to significantly suppress the grain size of the NiO crystallites. HRTEM images clearly reveal the dislocation areas with the displacement of lattice lines between CdO and NiO, which might contribute to the significantly improved properties of NiO nanofibers after CdO-doping. The as-prepared NiO-CdO nanofibers are further applied to the non-enzymatic glucose detection and their glucose response is around 9-fold and 1650-fold higher than those obtained with pristine NiO nanofibers and CdO nanofibers, respectively, in the cyclic voltammetry studies. The simple strategy of doping conductive CdO into a semi-conductive metal oxide with dislocation feature opens a new route to generate novel conductive metal oxide composite nanofibers with outstanding functions, which may have great potential applications ranging from sensors to energy area. © The Royal Society of Chemistry 2011. Source

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