Liyang Lin

Facile synthesis of NiO nanowires and their gas sensing performance

The NiO nanowires were prepared by a facile PEG assisted hydrothermal method using NiC2O4·2H2O as a precursor compound. The microstructure of the samples was characterized by SEM and XRD. The gas sensing properties of the NiO nanowires toward ethanol was also investigated. The results show that PEG plays a key role in the synthesis of wire-like NiO. The NiO nanowires show excellent sensing performances to ethanol gas. This morphology holds substantial promise for applying NiO as a potential gas sensing material for future sensor application.

Effect of different structures on the gas sensing property of ZnO

We have successfully reported a new diamond-like morphology of zinc oxide (ZnO) structures via a simple hydrothermal method and discussed its probable growth mechanism. Compared with other morphologies of ZnO structures (microrods and nanosheets), nanodiamonds have excellent gas-sensing property owning to its large specific surface area, holding the perfect promise for ZnO powders as underlying gas-sensing materials. Furthermore, the as-prepared nanosheets assisted with the sodium citrate as an additive were found to show better gas-sensing property due to the smaller size than microrods. We found the positive role of the sodium citrate and reaction time in the growth of nanosheets and nanodiamonds respectively and the corresponding influences on growth mechanism were discussed.

Core–shell NiCo 2 O 4 @ZnWO 4 nanosheets arrays electrode material deposited at carbon-cloth for flexible electrochemical supercapacitors

Three dimensional (3D) hierarchical NiCo2O4 nanosheet arrays (NSAs)@ZnWO4 nanoflakes (NFs) core–shell structures have been successfully grown on a carbon cloth (CC) using two-step hydrothermal approach, following a heat treatment route. Compared with the pure CC@NiCo2O4 NSAs electrode, the binder-free CC@NiCo2O4@ZnWO4 hybrid system gives rise to a higher specific capacitance of 872.0 Fg−1 at a low current density of 1 Ag−1 and 791.1 Fg−1 at a quite high current density of 20 Ag−1, and retains ~ 92.9% of the initial capacitance even after 5000 cycles of charge and discharge. The excellent electrochemical performance of CC@NiCo2O4@ZnWO4 electrode is attributed to its high specific surface area of the 3D structures, fast electron transport property of NiCo2O4 material as the skeleton, and the synergistic effect between NiCo2O4 and ZnWO4 materials, demonstrating that CC supported NiCo2O4 NSAs@ZnWO4 NFs composite as the high-performance electrode materials are highly desirable for the application of flexible supercapacitors.