Liyong Wang

Hebei University, Pao-ting-shih, Hebei, China

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Publications (8)24.04 Total impact

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    ABSTRACT: Monodisperse barium tungstate (BaWO4) hierarchical ellipsoidal particles have been prepared via a simple citrate-assisted hydrothermal method. The as-synthesized particles are non-aggregated with narrow size distribution and are composed of closely packed nanoparticles. The possible formation process of the BaWO4 ellipsoids were investigated by time-dependent experiments. During the hydrothermal process, the chelating agent trisodium citrate plays a crucial role for the formation of BaWO4 hierarchical ellipsoidal particles. The as-synthesized BaWO4:Tb3+ phosphor shows intense green emission under ultraviolet light excitation, which may find potential applications in fields of fluorescent lamps, display systems, and optoelectronic devices. Moreover, this simple synthesis route may be of great significance in the preparation of other well-defined tungstate functional materials.
    Science of Advanced Materials 04/2014; 6(4). DOI:10.1166/sam.2014.1770 · 2.60 Impact Factor
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    ABSTRACT: Uniform and well-dispersed SrWO4 microspheres have been successfully synthesized through a hydrothermal method by using trisodium citrate and SDS as surfactants. XRD and SEM results demonstrate that the as-synthesized SrWO4 particles are high purity well crystallized and exhibit a relatively uniform spherical morphology. The as-obtained SrWO4:Ln3+ (Ln = Tb, Eu, Dy, and Sm) microspheres show intense light emissions with different colors coming from different Ln3+ ions under ultraviolet excitation, which might find potential applications in the fields such as light emitting phosphors, advanced flat panel displays, and light-emitting diodes (LEDs).
    Journal of Nanoscience and Nanotechnology 05/2013; 13(1):611-6. DOI:10.1166/jnn.2013.6856 · 1.56 Impact Factor
  • Liyong Wang · Yongqiang Cheng · Hui Wang · Zhengping Li
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    ABSTRACT: Based on the high efficiency of fluorescence quenching and the different affinities of water-soluble carbon nanoparticles (CNPs) towards single-stranded DNA (ssDNA) and double-stranded DNA/RNA hybrid, a novel, rapid and cost-effective assay for detection of microRNA and nuclease activity was developed. The fluorescein-labeled ssDNA probe (FAM-P) could be adsorbed on the surface of CNPs through π-π stacking interaction giving rise to fluorescence quenching. By introduction of microRNA complementary to the DNA probe, the double-stranded DNA/miRNA hybrid could be formed and released from the surface of CNPs resulting in the fluorescence recovery. Thus, microRNA was successfully detected in homogenous fashion without any amplification or enzyme-involving reactions. Moreover, we demonstrated that the nuclease activities of RNase H and DNase I could also be sensitively monitored by using CNPs based on the fluorescence changing of the DNA probe. So, the CNPs provide an excellent homogeneous sensing platform for studying molecular diagnosis and therapeutics.
    The Analyst 07/2012; 137(16):3667-72. DOI:10.1039/c2an35396b · 4.11 Impact Factor
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    ABSTRACT: Ligase chain reaction (LCR) offers a simple and robust alternative platform for nucleic acid amplification, but its application has been limited because the LCR products are mostly detected by gel electrophoresis separation or heterogeneous analysis. In this paper, we report a novel homogeneous LCR assay by using cationic conjugated polymers (CCPs) as an indicator for detection of single-nucleotide polymorphism (SNP). For LCR, we design two pairs of unique target-complement probes. Each pair of probes contains two adjacent probes, in which one probe is designed with phosphorothioate modification at its 3'-end, and the other probe is labeled with fluorescein at its 5'-end. After the LCR, the two adjacent probes are ligated to form one DNA strand with a fluorescein label at its 5'-end and phosphorothioate modification at its 3'-end, which is resistant to the exonuclease I and exonuclease III degradation. When the CCP is added, because of the strong electrostatic interactions between CCP and DNA, effective fluorescence resonance energy transfer (FRET) from the CCP to the fluorescein-labeled DNA can be observed. In contrast, the unligated fluorescein-labeled probes are degraded to the mononucleotides by exonuclease I and exonuclease III. Introduction of CCP leads to inefficient FRET results because much weaker electrostatic interactions between the fluorescein-labeled mononucleotides and CCP keep the fluorescein far away from CCP. Accordingly, homogeneous LCR for SNP detection is performed successfully. The method is sensitive and specific enough to detect 1 fM (600 zmol) DNA molecules. It is possible to quantify SNP and accurately determine the allele frequency as low as 1.0%. This proposed assay strategy extends the application of LCR and provides a new platform for homogeneous detection of SNP.
    Analytical Chemistry 03/2012; 84(8):3739-44. DOI:10.1021/ac300314c · 5.64 Impact Factor
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    ABSTRACT: Uniform and well-dispersed quasi-spherical YVO4:Ln3+ (Ln = Eu, Dy) nanoparticles have been successfully synthesized through a solvothermal approach using EG and PVP as solvent and surfactant, respectively. SEM and TEM images indicate that the as-obtained quasispheres are composed of tiny packed nanocrystallites. The YVO4:Eu3+ and YVO4:Dy3+ samples show strong red and yellow light emissions under ultraviolet excitation. The luminescence intensities of the phosphors are greatly enhanced by co-doping Ba2+ ions into the YVO4host lattice. Nitrogen adsorption–desorption measurements reveals that the as-synthesized luminescent quasi-spherical nanoparticles have a porous structure, which might find potential applications in the fields of luminescence, drug delivery, and disease therapy.
    CrystEngComm 12/2011; 14(2):573-578. DOI:10.1039/C1CE05725A · 4.03 Impact Factor
  • Guang Jia · Cuimiao Zhang · Shiwen Ding · Liyong Wang
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    ABSTRACT: Uniform upconversion luminescent gadolinium oxide hollow spheres were successfully synthesized via a homogeneous precipitation method with carbon spheres as template followed by a calcination process. During the annealing process, the carbon spheres template can be effectively removed and the amorphous precursor has converted to crystalline Gd2O3, which can be confirmed by the XRD and TG-DSC analysis. SEM and TEM images indicate that the Gd2O3 hollow spheres with diameters of 300-400 nm are uniform in size and distribution. The rare earth activator ions Ln3+-doped Gd2O3 hollow spheres exhibit intense upconversion luminescence with different colors under 980 nm light excitation, which may find potential applications in the fields such as drug delivery or biological labeling. Moreover, the upconversion luminescent mechanisms of the hollow spherical phosphors were investigated in detail.
    Journal of Nanoscience and Nanotechnology 08/2011; 11(8):6875-9. DOI:10.1166/jnn.2011.4207 · 1.56 Impact Factor
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    ABSTRACT: Well-dispersed lutetium oxide (Lu2O3) hollow spheres have been obtained by a template-directed method with carbon spheres as template followed by a heat treatment. The main synthesis process was carried out in aqueous condition without any organic solvents, surfactant, or etching agents. SEM and TEM images reveal that the Lu2O3 hollow spheres inherit the spherical shape and good dispersion of carbon spheres, and the shells of the hollow spheres are composed of a large amount of uniform nanoparticles. The lanthanide activator ions doped Lu2O3 hollow spheres show intense down- and upconversion luminescence with different colors under ultraviolet or 980nm light excitation, which may find potential applications in the fields of drug delivery or biological labeling. Furthermore, the luminescent mechanisms of the luminescent hollow spheres were investigated.
    Journal of Alloys and Compounds 06/2011; 509(22):6418-6422. DOI:10.1016/j.jallcom.2011.03.075 · 3.00 Impact Factor
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    ABSTRACT: Polycrystalline BiFeO3 nanoparticles (size 30-50 nm) were prepared by a simple microwave synthesis technique. The nanoparticles were characterized by XRD, TEM and TG-DTA. The applied experiments show that they are very efficient for photo-catalytic decomposition of organic contaminants under irradiation ultraviolet frequency. The as-obtained BiFeO3 nanoparticles also demonstrate strong ferromagnetism of about 0.045 microB/Fe at room temperature, which is in good agreement with theoretical calculations.
    Journal of Nanoscience and Nanotechnology 06/2011; 11(6):5207-9. DOI:10.1166/jnn.2011.4197 · 1.56 Impact Factor