Qingyun Liu

Ocean University of China, Tsingtao, Shandong Sheng, China

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Publications (6)10.67 Total impact

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    ABSTRACT: Volvox-like Cdx Zn1-x S solid solutions with a cubic zinc blend structure were synthesized through a template-free ethylene glycol process. Cd(Ac)2 ⋅2 H2 O, Zn(Ac)2 ⋅2 H2 O, and thiourea are used as the starting materials and dissolved in ethylene glycol. These reaction precursors and solvent not only contributed to control over the formation of the volvox-like spherical geometry, but also exerted vigorous domination for existence of cubic-phase Cdx Zn1-x S nanostructures. As-prepared volvox-like Cdx Zn1-x S nanospheres have a diameter of around 100 nm with extensional shells. These samples show excellent photocatalytic H2 evolution activity from water splitting under visible-light irradiation without any cocatalyst or scaffolding, owing to their tunable band gap, cubic zinc blend structure, and unique hierarchical porous structure with a high surface area (as high as 95.2 m(2) g(-1) ).
    Chemistry - An Asian Journal 01/2014; · 4.57 Impact Factor
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    ABSTRACT: Various nanostructures of 5,10,15,20-tetrakis(4-carboxyl phenyl)-porphyrin (H2TCPP) can be easily synthesized by a surfactant-assisted self-assembly (SAS) method at different temperatures. When the DMF solution of porphyrin monomer was injected into cetyltimethylammonium bromide (CTAB) aqueous solution by a syringe, diverse H2TCPP nanostructures dependent on the different temperatures, including hollow nanospheres, solid nanospheres and nanospheres with holes, were successfully obtained. As a result, the suitable concentration of the CTAB aqueous solution used to form nanostructues of porphyrin ranges from 0.15 to 0.2mM. The various morphologies of porphyrin nanostructures were characterized by transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and scanning electron microscopy (SEM). UV-vis adsorption spectra showed that the micro-/nano-aggregate properties of porphyrin transformed from H-aggretates to J-aggregates during the process of self-assembly of porphyrin at different temperatures. Fluorescence spectra revealed a greater fluorescence quenching of various micro-/nano-aggregatess of porphyrin formed at different temperatures in aqueous solution, compared to the DMF solution of porphyrin monomer.
    Materials science & engineering. C, Materials for biological applications. 12/2013; 33(8):4944-4951.
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    ABSTRACT: A simple hydrothermal process was adopted to self-assembly prepare high infrared reflective antimony trioxide with three-dimensional flower-like microstructures. The morphologies of antimony trioxide microstructures were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM) respectively. It is also found that experimental parameters, such as NaOH concentration, surfactant concentration and volume ratio of ethanol–water played crucial roles in controlling the morphologies of Sb2O3 microstructures. A possible growth mechanism of flower-like Sb2O3 microstructure was proposed based on the experimental data. UV–vis–NIR spectra verified that the near infrared reflectivity of the obtained flower-like microstructures could averagely achieve as 92% with maximum reflectivity of 98%, obviously higher than that of other different morphologies of antimony trioxide microstructures. It is expected that the flower-like Sb2O3 nanostructures have some applications in optical materials and heat insulation coatings.
    Journal of Solid State Chemistry 04/2013; 200:136–142. · 2.04 Impact Factor
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    ABSTRACT: Nanotubes of metal-free 5,10,15,20-tetrakis(4-chlorophenyl)porphyrin (H2TClPP) are fabricated by using nanoporous anodized aluminum oxide (AAO) membrane as the template. The morphology and structure of the nanotubes are investigated by using transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). It is found that the outer diameter of the nanotubes matches well with the pore diameter of the AAO membranes, and interestingly, the porphyrin molecules packed orderly within the nanotube walls. The properties of the nanotubes of H2TClPP have been investigated by using UV-vis absorption spectroscopy and steady-state fluorescence spectroscopy. Absorption spectra reveal the formation of J aggregates of the porphyrin molecules within the nanotubes. While fluorescence spectra show a significant fluorescence quenching for the nanotubes dispersed in a water solution in comparison to the solution of H2TClPP in chloroform, due to strong supramolecular π–π and van der Waals interactions.
    RSC Advances 01/2013; 3(8):2765-2769. · 2.56 Impact Factor
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    ABSTRACT: Porous copper oxide (CuO) hollow microspheres have been successfully fabricated by using carbon spheres as templates. The products were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and Fourier transform infrared spectroscopy (FTIR). The influences of different experimental parameters on the morphology of CuO structures have been investigated in detail and the possible formation mechanism of porous CuO hollow microspheres has also been proposed. The specific surface area of the hollow spheres with 74.805 m2/g is measured by BET method. Barrett-Joyner-Halenda (BJH) calculations for the pore size distribution, derived from desorption data, reveal that the average pore radius is 8.56 nm, and the total pore volume (r = 1686.1 A, P/P0 = 0.994296) is 0.107257 cc/g. UV-vis absorption spectrum shows quantum size effect of porous CuO hollow microspheres. Furthermore, the porous CuO hollow microspheres exhibit high efficiency for photodegradation of a sample organic dye, Rhodamine B (RhB), under UV light.
    Journal of Nanoscience and Nanotechnology 11/2011; 11(11):10271-7. · 1.15 Impact Factor
  • Source
    Qingyun Liu, Shengsong Ge, Guangwen Cui
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    ABSTRACT: In the title compound, [CuZnCl(2)(C(19)H(20)N(2)O(4))], the Cu(II) ion exhibits a slightly distorted square-planar coordination geometry defined by two N atoms and two O atoms of the 6,6'-dimeth-oxy-2,2'-[propane-1,3-diylbis(nitrilo-methyl-idyne)]diphenolate Schiff base ligand. The Zn(II) ion is also four-coordinated by the two phenolate O atoms of the Schiff base ligand and by two cis-coordinated chloride anions.
    Acta Crystallographica Section E Structure Reports Online 01/2009; 65(Pt 4):m359. · 0.35 Impact Factor