Qingyun Liu

Shandong University of Science and Technology, Tsingtao, Shandong Sheng, China

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Publications (17)24.15 Total impact

  • [Show abstract] [Hide abstract]
    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: 5,10,15,20-tetrakis(4-carboxyl phenyl)-porphyrin (H2TCPP)-Fe3O4 nanocomposites were demonstrated to possess intrinsic peroxidase-like activity and a higher catalytic activity, compared to that of Fe3O4 NPs alone.
    Materials Science and Engineering: C. 01/2014; 41:142–151.
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    ABSTRACT: 5,10,15,20-tetrakis(4-carboxyl phenyl)-porphyrin (H2TCPP)–CdS nanohybrids were demonstrated to possess intrinsic peroxidase-like activity and used for a glucose colorimetric sensor.
    Materials Science and Engineering: C. 01/2014; 42:177–184.
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    ABSTRACT: 5,10,15,20-Tetrakis(4-carboxyl phenyl)-porphyrin functionalized Co3O4 nanocomposites (H2TCPP–Co3O4 NCs) were demonstrated to exhibit more excellent intrinsic peroxidase-like activity with higher catalytic activity than that of pure Co3O4 NPs and the sensitive detection limit for glucose determination was as low as 8.6 × 10− 7 M.
    Materials Science and Engineering: C. 01/2014; 43:321–329.
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    ABSTRACT: 5,10,15,20-tetrakis(4-carboxyl phenyl)-porphyrin functionalized CdS nanocomposites (H2TCPP-CdS NCs) were prepared by a facile method under mild conditions and were demonstrated to exhibit higher photocatalytic degradation activity toward Rhodamine B (RhB) irradiated by solar light than that irradiated by UV light. It is clear that the intense red color of the starting solution gradually disappears with increasingly longer exposure time.
    Materials Science and Engineering: B. 01/2014; 188:106–113.
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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. · 3.71 Impact Factor
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    ABSTRACT: Highly ordered nanorods of CdCl2·H2O were found to grow on the Langmuir film surface of the sandwich-type (phthalocyaninato) [tetrakis(4-pyridyl)porphryrinato] cerium double-decker complex [Ce(Pc)(TPyP)]. Experimental results revealed the important template role the Langmuir monolayer of [Ce(Pc)(TPyP)] played during the formation of well orientated CdCl2·H2O nanorods because of the metal–ligand coordination interaction between the Cd2+ cations in the subphase solution and the pyridyl groups of the double-decker molecules. The CdCl2·H2O nanorods formed were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), atomic force microscopic (AFM) and X-ray photoelectron spectroscopy (XPS).
    CrystEngComm 01/2012; 14(3):1105-1110. · 3.88 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
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    ABSTRACT: Interfacial assembly of sandwich mixed (phthalocyaninato)(porphyrinato) rare earth triple-decker complexes [(Pc)Eu(Pc)Eu(TPyP)] (1) and [(TPyP)Sm(Pc)Sm(TPyP)] (2) (Pc = phthalocyaninate, TPyP = meso-tetrakis(4-pyridyl)porphyrinate) has been comparatively studied at the air/pure water and the air/CdCl2 aqueous solution subphase interfaces. Surface pressure-area isotherms revealed the remarkable increase of limiting mean molecular area of the triple-deckers with the presence of Cd2+, suggesting the occurrence of in situ interfacial coordination. The formation of coordination bonds between the pyridyl groups of TPyP macrocycles in the triple-deckers and Cd2+ ions from the subphase was further supported by FT-IR spectroscopic data. Electronic absorption measurements showed the formation of J-aggregates of the triple-decker molecules in the interfacial assembled films.
    Materials Science and Engineering: C. 01/2011; 31(5):950-953.
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    ABSTRACT: Silver dendritic nanostructures and nanoplates were prepared at the solid/liquid interfaces via electroless deposition. Langmuir monolayers of 5,10,15,20-tetra-4-oxy(2-stearic acid) phenyl porphyrin (TSPP) and arachidic acid (AA) were formed at the air/AgNO3 aqueous solution interface. These nanostructures were produced when carbon-coated copper grids were covered on the Langmuir monolayers at lower (<20 °C) and higher (20–50 °C) temperature, respectively, and the branches are composed of parallel aligned nanobelts with their (110) face parallel to the interface. The formation of the nanostructures should be attributed to the galvanic reduction of Ag+ ions by copper, the electronic conductivity of the carbon layer, the templating effect of the Langmuir monolayer, and the non-equilibrium growth and aggregation of silver nanoparticles at the interface. This is a convenient avenue to produce metal nanostructures.
    Colloids and Surfaces A Physicochemical and Engineering Aspects 01/2010; 353:166-171. · 2.11 Impact Factor
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    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
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    ABSTRACT: Nanotubes of sandwich-type mixed (porphyrinato)(phthalocyaninato)europium(III) double-decker, H{Eu(TClPP)[Pc(α-OC4H9)8]} [TClPP = 5,10,15,20-tetrakis(4-chlorophenyl)poprhyrinate; Pc(α-OC4H9)8 = 1,4,8,11,15,18,22,25-octakis(1-butyloxy)phthalocyaninate] were fabricated by using nanoporous anodized aluminum oxide (AAO) membrane as the template. The tubular structure was investigated by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and UV−visible spectroscopy. It was found that the outer diameter of the nanotubes was matched with the pore diameter of AAO membrane very well. HRTEM micrographs reveal that the walls of the nanotubes have orderly layered structure and the distance between the adjacent layers is 0.58 nm, which agrees well with the size (thickness) of one double-decker molecule, indicating that the nanotubes are supramolecular structures formed from the double-decker molecules due to π−π interaction between the macrocycles. UV−vis spectroscopic results of the nanotubes also confirmed the formation of J-aggregates of the complex molecules, consistent with HRTEM investigation results.
    Journal of Physical Chemistry C - J PHYS CHEM C. 05/2007; 111(20).
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    ABSTRACT: Regular square, wirelike, quadrate, and rodlike nanocrystal arrays of Cd2+, Hg2+, or Ag+ metal-cation-mediated sandwich-type mixed (phthalocyaninato) [5,10,15,20-tetrakis(4-pyridyl)poprhyrinato] cerium(III) double-decker complex Ce(Pc)(TPyP) have been successfully prepared at the water-chloroform interface. The nanocrystal growth processes were monitored by transmission electron microscopy (TEM), which reveals that different morphologies of nanocrystals have been fabricated from double-decker molecules connected by different kinds of metal cations, forming coordination polymers. These nanoscaled coordination polymers were characterized by FT-IR spectra and energy-dispersive X-ray spectra (EDS). EDS results clearly revealed the elements of the nanocrystals and the FT-IR spectra give evidence for the coordination interaction between the double-decker molecules and metal cations. The UV-vis absorption spectrum indicates the formation of J-aggregates of the double-decker molecules in the nanocrystals formed.
    Journal of Colloid and Interface Science 01/2007; 304(2):431-6. · 3.17 Impact Factor
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    ABSTRACT: Three 1,8,15,22-tetrasubstituted phthalocyaninato nickel complexes Ni[Pc(alpha-OR)(4)] [H(2)Pc(alpha-OC(5)H(11))(4) = 1,8,15,22-tetrakis(3-pentyloxy)phthalocyanine; H(2)Pc(alpha-OC(7)H(15))(4) = 1,8,15,22-tetrakis(2,4-dimethyl-3-pentyloxy)phthalocyanine; H(2)Pc(alpha-OC(10)H(7))(4) = 1,8,15,22-tetrakis(2-naphthyloxy)phthalocyanine] (1-3) have been prepared by treating the corresponding metal-free phthalocyanines H(2)Pc(alpha-OR)(4) with Ni(acac)(2)2H(2)O in refluxing n-pentanol. Structures of the Langmuir monolayers of these compounds at different temperature have been investigated. Compound 1 formed nano-ring structures with the outer diameter of 70-150 nm and inner diameter of 50 nm at 25.0 degrees C while 2 and 3 formed round particles. This difference can be ascribed to the different substituents at alpha position. The morphologies of the aggregates of 1 in monolayers have been found to change with temperature. Decreasing in temperature induced the formation of regular quadrate crystals. UV-vis absorption spectra revealed strong intermolecular interactions in the nano-ring aggregates. Polarized UV-vis absorption spectra suggest a titled orientation with respect to the surface of substrate for phthalocyanine macrocycles in the nano-ring aggregates.
    Journal of Colloid and Interface Science 09/2006; 300(1):298-303. · 3.17 Impact Factor
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    ABSTRACT: The Raman spectroscopic data in the range of 500-1800 cm-1 for two series of thirty homoleptic bis(phthalocyaninato) rare earth complexes M(Pc)2 and M[Pc(OC8H17)8]2 [M = Y, La-Lu except Pm; H2Pc = unsubstituted phthalocyanine, H2Pc(OC8H17)8 = 2,3,9,10,16,17,23,24-octakis(octyloxy)phthalocyanine] have been collected and comparatively studied using laser excitation sources emitting at 633 and 785 nm. Under both laser excitations, the marker Raman band of Pc2- and [Pc(OC8H17)8]2- in the Raman spectra of Ce(Pc)2 and Ce[Pc(OC8H17)8]2 appears as a strong scattering at 1498-1501 cm-1 with contributions from both pyrrole C=C and aza C=N stretches together with isoindole stretchings. This band has been found to upshift to 1502-1528 cm-1 in the Raman spectra of MIII(Pc)2 and MIII[Pc(OC8H17)8]2 as the marker Raman band of phthalocyanine monoanion radicals, Pc•- or [Pc(OC8H17)8]•-. With laser excitation at 633 nm, Raman vibrations derived from isoindole ring and aza stretchings in the range of 1300-1600 cm-1 for both series are selectively intensified. In contrast, when excited with laser radiation of 785 nm, the ring radial vibrations of isoindole moieties and dihedral plane deformations between 500 and 1000 cm-1 for M(Pc)2 and M[Pc(OC8H17)8]2 intensify to become the strongest scatterings. The present Raman results also reveal that the frequencies of Pc breathing, pyrrole stretching, isoindole stretchings, aza stretchings and coupling of pyrrole and aza stretchings depend on the rare earth ionic size, shifting to higher wavenumbers along with the lanthanide contraction due to the increased ring-ring interaction across the series. Moreover, under these laser excitations, in particular under 785 nm laser line, the Raman spectrum appearance, i.e. the pattern of relative intensities, also changes systematically depending on the rare earth ionic size.
    03/2006;

Publication Stats

6 Citations
24.15 Total Impact Points

Institutions

  • 2009–2014
    • Shandong University of Science and Technology
      Tsingtao, Shandong Sheng, China
  • 2013
    • Ocean University of China
      • College of Chemistry and Chemical Engineering
      Tsingtao, Shandong Sheng, China
  • 2006–2007
    • Shandong University
      • Department of Chemistry
      Jinan, Shandong Sheng, China