Yabo Zhu

Cuprous Sulfide/Reduced Graphene Oxide Hybrid Nanomaterials: Solvothermal Synthesis and Enhanced Electrochemical Performance

The cuprous sulfide nanoparticles (CuS NPs)-decorated reduced graphene oxide (rGO) nanocomposites have been successfully prepared via a facile and efficient solvothermal synthesis method. Scanning electron microscopy and transmission electron microscopy images demonstrated that CuS micronspheres composed of nanosheets and distributed on the rGO layer in well-monodispersed form. Fourier-transform infrared spectroscopy analyses and x-ray photoelectron spectroscopy showed that graphene oxide (GO) had been reduced to rGO. The electrochemical performances of CuS/rGO nanocomposites were investigated by cyclic voltammetry and charge/discharge techniques, which showed that the specific capacitance of CuS/rGO nanocomposites was enhanced because of the introduction of rGO.

Electrospinning Preparation of La-Doped SnO2 Hollow Nanofibers: An Improvement of Their Gas Sensing Properties

SnO2 hollow nanofibers with different amount of La-doped were prepared by electrostatic spinning method. Their composition, morphology and structure were characterized by XRD, SEM, BET and XPS respectively and their gas sensing properties were also investigated. The results showed that the hollow nanofibers with the molar ratio of tin to La of 7% had the best sensitivity to ammonia of 500 ppm at the temperature of 300 °C, and the sensitivity value reached 480, which was 10 times that of pure SnO2. And its response time was also significantly shortened.

The resistance characteristic of the polymer carbon microcoil composite with temperature change

ABSTRACT Novel polymer carbon microcoil (CMC) composite has been fabricated by the intercalation of polymer material into free volume contained in CMC sheets grown by chemical vapour deposition process. Then the resistance of composite was measured in two-probe method. It was observed that the resistances of the composite have good reversibility as the temperature cyclic changing near the room temperature; in addition, the intercalation of the organic polymers such as polyvinyl alcohol can improve the resistance sensitivity. We propose that the resistance change is dominantly determined by the contact junctions of CMCs in the composite, which gives a reasonable explanation to the reversibility. The study will be used for sensor research.