Na Wei

Shaanxi University of Science and Technology, Syanyan, Shaanxi, China

Are you Na Wei?

Claim your profile

Publications (4)8.43 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The original spherical α-Ni(OH)2 architectures with many cubic particles growing from the surface were successfully synthesized by a microwave-assisted hydrothermal method using urea as hydrolysis-controlling agent and polyethylene glycol (PEG) as surfactant. The NiO architectures with similar morphology were obtained by simple thermal decomposition of the precursor α-Ni(OH)2. The as-obtained products were well characterized by XRD, FTIR, TGA, SEM, TEM, UV–Vis and CVs. The experimental results showed that the diameter of spherical α-Ni(OH)2 architectures was in the range of 2–4 μm. The side length of the cubic particles was uniform about 200 nm. The cyclic voltammetric results showed that the reversible behavior of NiO electrode change better with the increasing of the cycle index. The original NiO we have prepared are expected to have good electrochemical behavior.
    Superlattices and Microstructures 02/2012; 51(2):232–238. · 1.98 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Mesoporous titanium dioxide beads with high surface areas (over 90 m(2)/g) and tunable pore sizes (from 12.8 to 16.5 nm) were synthesized via a solvothermal process heating by microwave irradiation, with ammonia being used as both a source of nitrogen and a control agent for the mesoporous structure. Structural characterization indicated that the mesoporous TiO(2) beads were composed of nanocrystals and pores and the beads possess a optical band gap energy of 3.11 eV. The doping nitrogen was in the form of NH(x) or NO(x) species and was adsorbed on surface of the beads, which caused changes to the surface electronic structure. The results show that the samples which possess higher-order structure, large surface area and well-defined crystallinity have the best performance in photocatalytic activities exhibited as evaluated in the degradation of methylene blue.
    Journal of hazardous materials 03/2011; 190(1-3):133-9. · 4.14 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The Ni(OH)2 architectures with flower-like morphology assembled from nanosheets have been successfully synthesized through a microwave-assisted hydrothermal method using urea as a hydrolysis-controlling agent and polyethylene glycol (PEG) as a surfactant. The NiO architectures with similar morphology were obtained by a simple thermal decomposition process of the precursor Ni(OH)2. The as-obtained products were well characterized by XRD, TG-DTA, SEM, TEM, FTIR and UV–Vis. The experimental results shown that flower-like Ni(OH)2 architectures with a diameter of 2.5–4.0μm are assembled from nanosheets with a thickness of 10–20nm and width of 0.5–1.5μm. The UV–Vis experimental results shown that the absorption edge of the NiO architectures have a blue-shift with the increasing of the calcination temperature.
    Advanced Powder Technology - ADVANCED POWDER TECHNOL. 01/2011; 22(3):422-426.
  • [Show abstract] [Hide abstract]
    ABSTRACT: The TiO2 hollow microspheres were prepared by microwave-assisted solvothermal treatment without template. The morphology and the phase of TiO2 hollow microspheres were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), and BET surface areas. The results show that the particles have hollow structures and the shell was covered by nanocrystals and have higher specific surface area. The possible formation mechanism of hollow TiO2 spherical structures has simply been proposed. The activity was evaluated by the photocatalytic degradation of methyl orange (MO). The results show that the particles having specific surface area show higher photocatalytic activity. It can be attribute to the doped F atoms and the creation of oxygen vacancies.
    Journal of Materials Science 46(4):931-937. · 2.31 Impact Factor