Shao-Min Zhou

Henan University, K’ai-feng-shih, Henan Sheng, China

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Publications (17)23.35 Total impact

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    ABSTRACT: In this work, we report a facile solvothermal route for synthesis of multi-crystalline isotropic Pb hollow sphere-like samples. In the absence of any template and catalyst, large-scale uniform Pb hollow microspheres with an inside diameter of 400 nm have been produced. The products are detected by electron microscopy, X-ray diffraction/photoelectron energy spectroscopy. Magnetic measurements reveal these as-fabricated specimens are superconducting with an onset Tc 11.05 K, which is 3.86 K above the bulk Tc (7.19 K). Superconducting Pb hollow microspheres with the high Tc may open up new possibilities for the fundamental understanding of the effect of dimensionality and superconducting mechanism.
    Materials Letters 09/2014; 130:57–60. · 2.27 Impact Factor
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    ABSTRACT: In this study, a series of manganese [Mn]-doped zinc oxide [ZnO] hierarchical microspheres [HMSs] are prepared by hydrothermal method only using zinc acetate and manganese acetate as precursors and ethylene glycol as solvent. X-ray diffraction indicates that all of the as-obtained samples including the highest Mn (7 mol%) in the crystal lattice of ZnO have a pure phase (hexagonal wurtzite structure). A broad Raman spectrum from as-synthesized doping samples ranges from 500 to 600 cm-1, revealing the successful doping of paramagnetic Mn2+ ions in the host ZnO. Optical absorption analysis of the samples exhibits a blueshift in the absorption band edge with increasing dopant concentration, and corresponding photoluminescence spectra show that Mn doping suppresses both near-band edge UV emission and defect-related blue emission. In particular, magnetic measurements confirm robust room-temperature ferromagnetic behavior with a high Curie temperature exceeding 400 K, signifying that the as-formed Mn-doped ZnO HMSs will have immense potential in spintronic devices and spin-based electronic technologies.
    Nanoscale Research Letters 01/2012; 7(1):100. · 2.52 Impact Factor
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    ABSTRACT: A systematic study was conducted on the fabrication, structural characterization, and magnetic properties of MgB2 wire-like nanostructures with C doping between 0% and 20%. Based on chemical vapor deposition technique, non/C-doped MgB2 nanowires (NWs) with an average diameter of 60nm and length up to several micrometers were produced by homemade MgB2 nanotubes, the mixture gases (Ar+CH4+H2), and Ni catalyst. Electron and X-ray diffraction confirm that the as-synthesized non/C-doped MgB2 NWs are single crystalline with primitive hexagonal lattice structure. DC magnetization measurements indicate a high superconducting transition temperature (39K) for nondoping MgB2 NWs and that on increasing the carbon content the transition broadens and shifts toward lower temperatures. The technique is an attractive synthetic method since its flexibility allows for optimization of the doping synthesis. In particular, a comprehensive investigation of influence of NW doping on superconductivity is reported for the first time.
    Materials Chemistry and Physics - MATER CHEM PHYS. 12/2011;
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    Yu-Biao Liu, Shao-Min Zhou
    Nanowires - Fundamental Research, 07/2011; , ISBN: 978-953-307-327-9
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    ABSTRACT: Iron oxides, including maghemite (γ-Fe2O3) and magnetite (Fe3O4), have been widely applied in many fields. For technological advances in the future, further improvements of their ferromagnetic properties are desirable. The development of iron ferrites with a large coercive field (Hc) is one of issues of consequence. For ferrites, however, enlarging the Hc value is not easy because of their low magnetocrystalling anisotropy constant. Here we report single-crystalline Cu-doped γ-Fe2O3 nanowires in which the controlled diameter (70–100 nm) and the graded Cu dopant (7, 10, and 15%) are directly obtained by a simple chemical vapor deposition technique. In particular, the coercive value (over 2 T) of 10% Cu-doped γ-Fe2O3 nanowires is much higher than that (<80 Oe) of undoped γ-Fe2O3 nanowires at room temperature. On the basis of the experimental magnetization data, the achievement of such a higher coercive field of Cu-doped γ-Fe2O3 (10%) nanowires is tentatively suggested.
    Journal of Materials Research. 07/2011; 26(13):1634 - 1638.
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    ABSTRACT: Based on chemical vapor deposition (CVD) in the absence of any template and catalyst, large-scale oriented vertical FeSe nanorod (NR) array (NRA) has been produced. Electron microscopy shows a typical diameter and length of single FeSe NRs are ~200 and 600nm, respectively and electron/X-ray diffraction confirms the single-crystal α-phase. Magnetic measurements reveal these NRAs are superconducting with an onset Tc above 16K, which is much higher than Tc of counterpart bulk sample (~8K). Superconducting FeSe NRAs with the Tc may open up new possibilities for the fundamental understanding of the effect of dimensionality.
    Materials Letters 06/2011; 65(11):1741-1743. · 2.27 Impact Factor
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    ABSTRACT: Cantilever-like nanostructures of β-Zn4Sb3 were firstly obtained from ZnO nanocantilevers and stibine using vapor deposition. The as-fabricated β-Zn4Sb3 products are characterized by different instruments and morphologies and the size of the samples is strongly dependent on ZnO nanocantilevers because they act as a source and sacrificial template. A typical width and length of the as–synthesized β-Zn4Sb3 nanocantilevers are 100 nm and 2 μm, respectively. The bulk β-Zn4Sb3 composed of nanocantilevers was tested by independent measurements of thermoelectric properties, which was very good with a ZT value of 1.49 at 675 K—the best—which may originate from local properties of phonon and electron distribution.
    Nanoscale and Microscale Thermophysical Engineering 04/2011; 15(2):95-104. · 1.33 Impact Factor
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    ABSTRACT: In this study, for the first time, high-yield chain-like one-dimensional (1D) Co nanostructures without any impurity have been produced by means of a solution dispersion approach under permanent-magnet. Size, morphology, component, and structure of the as-made samples have been confirmed by several techniques, and nanochains (NCs) with diameter of approximately 60 nm consisting of single-crystalline Co and amorphous Co-capped layer (about 3 nm) have been materialized. The as-synthesized Co samples do not include any other adulterants. The high-quality NC growth mechanism is proposed to be driven by magnetostatic interaction because NC can be reorganized under a weak magnetic field. Room-temperature-enhanced coercivity of NCs was observed, which is considered to have potential applications in spin filtering, high density magnetic recording, and nanosensors. PACS: 61.46.Df; 75.50; 81.07.Vb; 81.07.
    Nanoscale Research Letters 01/2011; 6(1):285. · 2.52 Impact Factor
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    ABSTRACT: One-dimensional (1D) nanostructures with precise controlled morphologies have not been easily accessible, usually degrading the device performance and therefore limiting applications to various advanced nanoscale magnetism. Generally bulk chromium dioxides are prepared by solid/liquid-phase reactions at elevated pressures or the chemical vapor deposition procedure whereas a liquid synthesis at non-pressure conditions, particularly for sonochemical one, has really been a challenge. Here we report on an ultrasound fabrication of large-scale CrO2 nanowires by using CrO2Cl2 and homemade Cr2O3 hollow nanospheres for the first time. The as-synthesized products were characterized by X-ray diffraction/photoelectron spectroscopy, scanning/transmission electron microscopy, high-resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, selected area electron diffraction, and superconducting quantum interference devices magnetometer, respectively. The results show the controlled nanowires with diameter of 100–200nm possess a single crystal tetragonal structure and exhibit a colossal coercive field (1678Oe) at room-temperature, which could have potential applications in spin filtering, high density magnetic recording, and nanosensors. The proposed chemical reaction mechanism is suggested in detail and such a colossal coercive field is tentatively explained.
    Chemical Engineering Journal - CHEM ENG J. 01/2011; 174(1):432-435.
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    ABSTRACT: Superparamagnetic Fe3O4 hollow microspheres with an average diameter of 240nm have been solvothermally synthesized where each of them is composed of primary nanoparticles with the size of 10–14nm. Based on electron microscopy technique, the morphological evolution with the reaction time is observed. Since the transformation from solid to hollow spheres was perceived, Ostwald ripening process is proposed to explain the formation of hollow microspheres. In particular, the magnetism investigation indicates that the as-prepared samples remain room-temperature superparamagnetic behavior with a high saturation magnetization (up to 83.5emu/g), which results from the separation of the primary magnetic nanoparticles. The excellent products may lead to many promising applications in enzyme immobilization, cancer therapies, and MRI contrast agents, and environment-friendly.
    Chemical Engineering Journal - CHEM ENG J. 01/2011; 175:555-560.
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    ABSTRACT: Large-scale single crystalline MgB2 tubelike nanostructures were successfully prepared by thermal evaporation of MgB2 particles precursors without involvement of template or patterned catalyst. The inner diameter, outer diameter and length of the as-fabricated single MgB2 nanotube (NT) are respectively about 30 nm, 90 nm and several tens of microns. Existence of superconductivity within the products is confirmed by AC and DC magnetic susceptibility at low temperatures. The work represents the achievement to produce the bulk superconductivity with the hollow-structured morphology. Synthesis of MgB2 NTs with bulk superconductivity may open up new possibilities for the fundamental understanding of the effect of dimensionality on superconductivity.
    Materials Letters - MATER LETT. 01/2009; 63(20):1680-1682.
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    ABSTRACT: On the basis of a rather stable wurtzite hexagonal ZnO nanotube (NT) template confining effect, we give the first report of a new high temperature superconducting (HTS) cable-like nanostructure in the iron-based oxyarsenide Sm[O0.8F0.2]FeAs. Scanning electron microscopy, x-ray diffraction, transmission electron microscopy (TEM), high resolution TEM, selected area electron diffraction and energy-dispersive x-ray spectroscopy results indicate that the as-fabricated nanocables consist of two materials: about 50–60 nm diameter single-crystal superconductor Sm[O0.8F0.2]FeAs nanowires (cores) and semiconductor ZnO NTs (shells) with outer diameters of about 150 nm and tube walls up to ~40–50 nm. The temperature dependence of the DC susceptibility unambiguously demonstrates a superconducting transition temperature at above 54 K, which indicates potential applications in hybrid devices combining HTS and ZnO semiconducting properties.
    Superconductor Science and Technology 10/2008; 21(12):125007. · 2.76 Impact Factor
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    ABSTRACT: High-density hierarchical brush-like nanostructures of Ce-doped ZnO are first synthesized by a two-step approach (sol–gel and chemical vapor deposition). This novel structure, called nanobrush, is a new member in the family of hexagonal crystal ZnO nanostructures, which is composed of two parts: a micron-sized prism-like base and nano-sized vertical nanorod arrays. The nanobrush is enclosed by the (0001) and {011¯0} facets and grows towards the [0001] direction. Room-temperature photoluminescence (RTPL) spectra show a weak UV emission but a strong broad green emission.
    Superlattices and Microstructures 08/2008; 44(2):183–190. · 1.98 Impact Factor
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    ABSTRACT: A single-crystalline ZnO nanorod array with rectangular cross-sections has been synthesized, in which the as-obtained products are a complete metastable zinc blende (ZB) phase. X-ray powder diffraction, electron microscopy, and elemental maps have been used to show that the ZB-ZnO samples have a lattice constant a = 4.580 Å, and are free from contamination by hexagonal wurtzite (HW) ZnO. Based on our experimental data, the associated growth mechanism is tentatively suggested. In addition, the photoluminescence (PL) spectrum (about 400 nm (3.1 eV)) of the as-fabricated ZB-ZnO products was detected; this is the first experimental report of the optical properties of ZB-ZnO nanorod arrays.
    Nanotechnology 04/2008; 19(17):175303. · 3.84 Impact Factor
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    ABSTRACT: Ni-doped comb-like zinc oxide (ZnO) semiconductor nanostructures have been synthesized by a simple chemical vapor-deposition method (CVD) at relatively low temperature. The as-synthesized ZnO nanocombs consist of an array of very uniform, perfectly aligned, evenly spaced and long single-crystalline nanobelts (nanowires) with periods of about several tens of nanometers. X-ray diffraction and Raman spectra results provide the evidence that Ni is incorporated into the ZnO lattice at Zn site. Photoluminescence spectra of the as-obtained samples have been detected, in which the incorporation of donor Ni leads to the increases of the ultraviolet emission intensity and a blueshift of emission peak. This technique can be used to prepare other semiconductors and morphology-controlled doping nanocombs.
    Physics Letters A 03/2008; · 1.63 Impact Factor
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    ABSTRACT: High-yield pure chain-like one-dimensional nanostructures consisting of single-crystal γ -Fe 2 O 3 nanoparticles have been produced by using a chemical vapor deposition (CVD) approach. The constituents, phase, and magnetic properties of these nanochains have been determined. The synthesized nanochains can be reorganized under a weak magnetic field (about 0.4 T). The nanochain growth mechanism is proposed to be driven by magnetostatic interaction. The hysteresis loop was operated to show that the magnetic properties of the nanochains are strongly influenced by the morphology of the crystal. Room temperature magnetic measurements show that the as-fabricated γ -Fe 2 O 3 nanochains are ferromagnetic with higher saturation magnetization and higher coercivity values than those of the counterpart bulk, which could have potential applications in spin filtering, high-density magnetic recording and nanosensors.
    Journal of Physics Condensed Matter 01/2008; 20:75217-4. · 2.22 Impact Factor
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    ABSTRACT: Based on physical vapor deposition (PVD) in the absence of any template and catalyst, β-Zn4Sb3 nanowires (NWs) have firstly been synthesized under controlled conditions. Composition, morphology, structure, and thermoelectric property of the fabricated β-Zn4Sb3 products are characterized by different instruments. Moreover, room temperature Hall effects are conducted to study the electric transport property of the as-annealed β-Zn4Sb3 NWs and synthesized powders. In particular, the as-obtained results reveal that the as-annealed β-Zn4Sb3 NWs possess a high dimensionless figure of merit (ZT, 1.59) at 675 K. It is much higher than that of all bulk β-Zn4Sb3 materials (no more than 1.3), which has potential applications for thermoelectric nanodevices.
    Materials Letters. 84:116–119.