Meng Zhang

University of Science and Technology of China, Luchow, Anhui Sheng, China

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Publications (10)78.4 Total impact

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    ABSTRACT: Flexible hetero-nanowire electronics: A simple solution process has been developed for the first time to fabricate macroscopic flexible, ordered Au–Te hetero-nanowire film electronics with tunable resistance from MΩ to Ω at room temperature (see the Figure). Nanowire films with an electrical conductivity as low as 10 000 S cm−1 and a sheet resistance of 15 Ω sq–1 can generate reliable interconnections for light-emitting diode (LED) arrays. The Au–Te hetero-nanowire films remain conductive after bending 6000 times with a maximum bending radius of 2.0 mm without any obvious degradation.
    Advanced Materials 11/2013; 25(41):5909. DOI:10.1002/adma.201370262 · 15.41 Impact Factor
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    ABSTRACT: Large scale greigite with uniform dimensions has stimulated significant demands for applications such as hyperthermia, photovoltaics, medicine and cell separation, etc. However, the inhomogeneity and hydrophobicity for most of the as prepared greigite crystals has limited their applications in biomedicine. Herein, we report a green chemical method utilizing β-cyclodextrin (β-CD) and polyethylene glycol (PEG) to synthesize bioinspired greigite (Fe3S4) magnetic nanocrystals (GMNCs) with similar structure and magnetic property of magnetosome in a large scale. β-CD and PEG is responsible to control the crystal phase and morphology, as well as to bound onto the surface of nanocrystals and form polymer layers. The GMNCs exhibit a transverse relaxivity of 94.8 mM(-1)s(-1) which is as high as iron oxide nanocrystals, and an entrapment efficiency of 58.7% for magnetic guided delivery of chemotherapeutic drug doxorubicin. Moreover, enhanced chemotherapeutic treatment of mice tumor was obtained via intravenous injection of doxorubicin loaded GMNCs.
    Scientific Reports 10/2013; 3:2994. DOI:10.1038/srep02994 · 5.58 Impact Factor
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    ABSTRACT: Ultralong orthorhombic silver trimolybdate nanowires (NWs) can be synthesized by a simple hydrothermal process without using any structure directing agent. Their phase transformation and stability to thermal and modeling sunlight from a Xe lamp have been systematically studied. Well-dispersed Ag nanoparticles can in situ form on the backbone of the nanowires by photoirradiation, and their photocatalytic and optical properties have been investigated. The investigations on photocatalytic, photoluminescent, and surface-enhanced Raman scattering (SERS) of the as-synthesized nanowires indicate that these nanowires loaded with Ag nanoparticles by photoirradiation can be a new kind of photocatalytic and luminescent material and potentially can be used as an efficient SERS substrate. The electrical conductivity of an individual nanowire exhibits almost nonlinear and symmetric current/voltage (I/V) characteristics for bias voltages in the range of -5 to 5 V. Ohmic mechanism, Schottky, and the Poole-Frenkel emission play an important part, respectively, in low, medium, and high electrical fields.
    ACS Nano 08/2011; 5(8):6726-35. DOI:10.1021/nn202296h · 12.03 Impact Factor
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    ABSTRACT: Zn(1 - x)Mn(x)Se (x = 0-0.15) nanobelts and nanotubes can be synthesized via the removal of diethylenetriamine (DETA) in 1-octadecene (ODE) and ethylene glycol (EG), respectively, using [Zn(1 - x)Mn(x)Se](DETA)(0.5) nanobelts as a template. The as-prepared ZnSe nanobelts are single-crystalline and grown along the [001] direction, and the ZnSe nanotubes consist of nanoparticles assembled along the [001] direction. In addition, Mn(2+)-doped Zn(1 - x)Mn(x)Se (x = 0.05, 0.10, 0.15) nanotubes are prepared for the first time if doped [Zn(1 - x)Mn(x)Se](DETA)(0.5) nanobelts are used as the template. The formation process of Zn(1 - x)Mn(x)Se nanobelts and nanotubes has been studied, and a plausible mechanism is proposed. Photoluminescence (PL) and electron paramagnetic resonance (EPR) spectra of Zn(1 - x)Mn(x)Se nanobelts and Zn(1 - x)Mn(x)Se nanotubes have been investigated.
    Langmuir 08/2010; 26(15):12882-9. DOI:10.1021/la101595n · 4.38 Impact Factor
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    ABSTRACT: Uniform and ultralong single-crystalline tellurium (Te) nanowires with a diameter of 20 nm and length of tens of micrometers can be rapidly synthesized by a microwave-assisted method. The formation process of high-quality Te nanowires is strongly dependent on the reaction conditions such as the amount of polyvinylpyrrolidone (PVP), pH value of initial solution, reaction time, and the choice of surfactant. The hydrophilic Te nanowires display a broadened luminescent emission from shortwave ultraviolet to visible region excited by vacuum-ultraviolet (VUV) under synchrotron radiation at room temperature. Based on the examination of the chemical stability of the as-prepared Te nanowires stored in water, the relationship between the synthetic methodology and chemical stability of Te nanostructures has been discussed.
    Langmuir 07/2010; 26(13):11372-7. DOI:10.1021/la100772n · 4.38 Impact Factor
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    ABSTRACT: Highly hierarchical structures of silver indium tungsten oxide (AgIn(WO4)2) mesocrystals can be rationally fabricated via the microwave-assisted synthesis method by tuning the initial concentrations of the precursors. Photoluminescence spectra of hierarchical AgIn(WO4)2 mesocrystals were measured to investigate the correlation between the morphology, pressure, and temperature and their luminescence properties. The materials showed interesting white emission when excited by visible light of wavelength 460 nm. AgIn(WO4)2 materials having different morphologies displayed notable differences in photogenerated emission performance. The emission was strongly correlated with the surface nanostructures of outgrowths, with larger amounts of outgrowths leading to stronger emission intensities. The pressure- and temperature-dependent photoluminescence properties of these materials have also been investigated under hydrostatic pressures up to 16 GPa at room temperature and in the temperature range from 10 to 300 K. KeywordsPhotoluminescence-AgIn(WO4)2 -mesocrystal-morphology-high-pressure-temperature
    Nano Research 06/2010; 3(6):395-403. DOI:10.1007/s12274-010-1044-y · 6.96 Impact Factor
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    ABSTRACT: Mn-substituted 1D [Zn1−xMnxSe](DETA)0.5(DETA = diethylenetriamine, x = 0−0.3) inorganic−organic hybrid nanobelts have been synthesized by a solvothermal reaction in a mixed solvent media. Strong Mn2+ internal transition (4T1 → 6A1) emission peaks at 585 nm (2.12 eV) are detected at room temperature photoluminescence (PL) spectra, and the highest emission intensity is obtained when the nominal Mn content x = 0.15. Temperature- and pressure-dependent photoluminescent properties as well as the electron paramagnetic resonance (EPR) spectra of [Zn1−xMnxSe](DETA)0.5 nanobelts have been studied for the first time. Temperature-dependent PL spectra show that the lower the temperature, the higher the intensity of the emission intensity. Under high pressure, a large red shift of Mn2+-related orange luminescence is observed and luminescent intensity is greatly decreased as the pressure increases to 10.5 GPa. Pressure dependence of the Mn2+ PL integrated intensity and energy have the same kink point at 2.54 GPa, which give birth to two PL pressure coefficients in different pressure range.
    Chemistry of Materials 11/2009; 21(22). DOI:10.1021/cm902406e · 8.54 Impact Factor
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    ABSTRACT: ZnO nanorods/Au nanocomposites with Au nanocrystals growing at tips of ZnO nanorods or located along the surface of the nanorods can be synthesized via a facile low-cost solution method. The number of Au nanoparticles grown on ZnO nanorods can be controlled by tuning the molar ratio of ZnO to HAuCl4; thus, the ZnO/Au heterostructures displayed tunable UV and visible emission intensity. The cytotoxic studies on two different cell lines (CHO cells and Hela cells) indicated that ZnO/Au hybrid nanocrystals are biologically nontoxic. The MTT assays of these two cells are consistent, showing that ZnO/Au hybrid nanomaterials were low cytotoxic at concentrations of 10 μg/mL. It is found that cytotoxicity of ZnO/Au hybrid nanocomposites mainly comes from ZnO nanorods. Cellular uptake experiments revealed the ZnO/Au hybrid nanocrystals can enter into the endosomes and the cytosol. The as-prepared ZnO/Au hybrid nanocomposites with good biocompatibility may have potential applications in biomedicine.
    The Journal of Physical Chemistry C 11/2008; 112(50). DOI:10.1021/jp804547e · 4.84 Impact Factor
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    ABSTRACT: A simple solvothermal method has been discovered to synthesize single-walled flux-closure Ni-Co magnetic alloy nanorings in high yield, which are directly fabricated in a reaction solution and able to chronically exist in solution.
    Journal of the American Chemical Society 10/2008; 130(35):11606-7. DOI:10.1021/ja804467g · 11.44 Impact Factor
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    ABSTRACT: We report an environmentally benign process for the synthesis of nearly monodisperse silver nanoparticles in large quantities via a microwave-assisted “green” chemistry method in an aqueous system, using basic amino acids, such as l-lysine or l-arginine, as reducing agents and soluble starch as a protecting agent. The presence of amino acids with basicity such as l-lysine or l-arginine, having two amino groups in each molecule, is indispensable for the synthesis of uniform silver nanoparticles. The current synthetic process can be readily applied to large-scale production, for example, a reaction yielding 0.1 g of nearly monodisperse silver nanoparticles can be performed in a 80 mL microwave sealed vessel. This combination of solvent, renewable reactants, and microwave irradiation seem to make it clear that green chemical synthesis of metal nanoparticles with well-controlled shapes, sizes, and structures has practical potential. Self-assembly of starch-capped silver nanoparticles results in multilayered mirrorlike films forming on the glass slide surface. The surface plasmon transmission of the films has blue-shifted with decreasing silver atom concentrations of the films. The silver films offer great surface enhancement for 4-mercaptobenzoic acid (4-MBA) molecules, and the surface enhancement factor can be efficiently changed by the silver atom concentrations of the films.
    The Journal of Physical Chemistry C 07/2008; 112(30). DOI:10.1021/jp801267j · 4.84 Impact Factor