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Wang Y.,Northwest University for Nationalities | Wang Y.,Key Laboratory for Utility of Environment Friendly Composite Materials and Biomass in Universities of Gansu Province | Su Q.,Northwest University for Nationalities | Su Q.,Key Laboratory for Utility of Environment Friendly Composite Materials and Biomass in Universities of Gansu Province
Journal of Materials Science: Materials in Electronics | Year: 2016

Oxidized nickel/silver (NiO/Ag) nanocomposites were prepared via micro-emulsion method. In the method, the NiO nanospheres were dispersed in ethanol including sodium dodecyl sulfonate (SDS) and sonicated to form homogeneous suspension, and then an appropriate amount of AgNO3 aqueous solution was added to this suspension above, forming a micro-emulsion. In the micro-emulsion, the NiO nanospheres were surrounded with many Ag+ ions. With the adding of NaBH4, Ag+ ions were reduced to Ag nanospheres. Finally, a series of NiO/Ag nanocomposites were prepared successfully. The microstructures of as-prepared samples were characterized by the XRD, SEM. The results showed that NiO and Ag nanospheres formed uniform nanocomposites. The capacitance performance of NiO/Ag nanocomposites electrodes with different Ag loading contents was investigated. The results showed that the capacitance performance of NiO/Ag nanocomposites was accordingly increased as the Ag content increases. The capacitance of the NiO/Ag electrodes with 3 % Ag loading was effective to obtain fully reversible and higher specific capacitance of ~322 F g−1 at 1 A g−1 current density. © 2016 Springer Science+Business Media New York Source


Yin F.,Northwest University for Nationalities | Yin F.,Key Laboratory for Utility of Environment Friendly Composite Materials and Biomass in Universities of Gansu Province | Wu S.,Northwest University for Nationalities | Wu S.,Key Laboratory for Utility of Environment Friendly Composite Materials and Biomass in Universities of Gansu Province | And 8 more authors.
Journal of Solid State Chemistry | Year: 2016

Graphene-enhanced Raman scattering (GERS) has attracted much attention recently. In present study, monolayer of chemically reduced graphene oxide (RGO) nanosheets was chemically bonded on Si substrates and their possible applications in Raman scattering were investigated. In comparison with the mechanically exfoliated graphene, mildly reduced graphene oxide (MR-GO) monolayer is a better substrate to quench the fluorescence (FL) signals and simultaneously enhance the Raman signals of adsorbed Rhodamin 6G (R6G) molecules. Raman and X-ray photoelectron spectra indicate that π-π stacking and the residual polarized oxygen groups on MRGO surface, which can produce a strong local electric field under laser excitation, are mainly responsible for the excellent GERS effect of MR-GO substrate, while the charge transfer between R6G and MR-GO has a relatively low contribution for GERS effect. Our results not only provide a new approach to realize sensitive GERS substrate, but also are helpful for improving the fundamental understanding of GERS effect on RGO substrate. © 2016 Elsevier Inc. All rights reserved. Source

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