Yingjiu Zhang

National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan

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Publications (16)34.76 Total impact

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    ABSTRACT: Boron nanowires with different morphologies and diameters have been fabricated by laser ablation. The effects of the synthesis temperatures, intensities of the laser beams, the types of the metal catalysts and the addition of H3BO3 on the growth of the boron nanowires are studied. The systematic analyses show that the vapor–liquid–solid (VLS) model may play important roles in the growth of the boron nanowires.
    Chemical Physics Letters 02/2004; 385:177-183. · 2.15 Impact Factor
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    ABSTRACT: Physisorption of linear-chain alkane and fatty acid molecules on the outer surface of single-wall carbon nanotubes (SWNTs) has been studied by scanning tunneling microscopy (STM) measurements. These molecules are known to organize and form a self-assembled monolayer on a basal plane of graphite, showing a lamellar pattern. We have found that stearic acid molecules (C17H35COOH) also show a lamellar pattern on the SWNT surface. This suggests that stearic acid forms a self-assembled monolayer and modulates the surface charge density of SWNT. Formation of the self-assembled monolayer has been observed on the SWNTs surface less frequently than on the graphite surface. This can be explained in terms of an inhomogeneous chirality distribution of the SWNTs and weak van der Waals interaction between the molecules and SWNTs.
    Chemical Physics Letters 01/2004; · 2.15 Impact Factor
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    ABSTRACT: Indium (In) metal whiskers/nanowires, In2O3 nanowires, nanoscale In2O3 cubes and octahedrons are synthesized by heating In chunks at high temperature in Ar flow at ambient pressure. The In whiskers/nanowires have low melting point and thus can be evaporated (burnt) by the illumination of intensive electron beam, and provide a candidate to be used as solder and fuse in the nano-electronics. Different morphologies of In2O3 products, especially the nanoscale In2O3 cubes and octahedrons are firstly obtained by the traditional chemical vapor deposition process other than the solution one, which may indicate a new way to fabricate other kinds of nanoscale polyhedrons.
    Journal of Crystal Growth 01/2004; · 1.55 Impact Factor
  • Jun Liu, X. Zhang, Yingjiu Zhang, Xihua Chen, Jing Zhu
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    ABSTRACT: Two interesting carbon nanostructures, the double helices and the nanobraids, have been synthesized by pyrolysis of acetone at 715°C, using iron nanoparticles as catalysts. The double helix was formed by two nanofibers, strictly coiled together with a strikingly constant pitch. Such a rope-like structure usually extended hundreds of microns in length, and provided excellent strength, stability and flexibility. The nanobraids appeared to be partially rolled up from carbon layers. Electron microscopy was applied to characterize these carbon forms.
    Materials Research Bulletin 01/2003; 38(2):261-267. · 1.97 Impact Factor
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    ABSTRACT: Crystalline boron nanowires with tetragonal structure have been synthesized based on laser ablation of a B/NiCo target; the nanowires are sometimes single crystals and have a droplet at one end of the nanowire; the droplet contains B, Ni and Co elements, which indicates that the vapor-liquid-solid (VLS) mechanism may play a key role in the growth of the boron nanowires.
    Chemical Communications 01/2003; · 6.38 Impact Factor
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    ABSTRACT: By a simple method, that is, by heating raw materials in a flowing gas at ambient pressure, Si3N4, Ga2O3, and ZnO nanowires, SiC nanocables, and SiO2 amorphous nanowires are synthesized without metal catalysts. The diameters of these one-dimensional nanoscale materials are greatly affected by synthesis temperatures. At suitable synthesis temperatures, their diameters are <100 nm. The growth mechanisms of these nanowires are discussed preliminarily.
    Chemistry of Materials 07/2002; 14(8). · 8.24 Impact Factor
  • Yingjiu Zhang, Jing Zhu
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    ABSTRACT: Some synthesis methods to fabricate one-dimensional nanomaterials, including template-assisted growth, simple catalyst-free growth and chemical vapor deposition, and the characterization methods by transmission electron microscopy, for example, determination of mechanical properties of ceramic nanowires and helicity distribution of bundles of single-walled carbon nanotubes are reported and discussed.
    Micron 02/2002; 33(6):523-34. · 1.88 Impact Factor
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    ABSTRACT: Alumina nanotubes have been fabricated using carbon nanotubes (CNTs) as templates at 1473 K. The Al2O3 nanotubes are polycrystals. They are less than 100 nm in outer diameter and tens of nanometer in inner diameter, which is close to the outer diameters of the templates. Under certain conditions, AlN and Al2O3 nanowires can also be fabricated in this reaction system. Discussions on the growth mechanisms of these nanotubes and nanowires are presented.
    Chemical Physics Letters 01/2002; · 2.15 Impact Factor
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    ABSTRACT: Si3N4 nanowires and SiO2 amorphous nanowires with diameters of 10–70 and 10–300 nm, respectively, have been synthesized by heating Si powders or Si/SiO2 mixtures with or without metal catalyst at 1200°C at ambient pressure. It is found that the reactant gases (N2, Ar and NH3) affect the yields and morphologies of the products, and the metal catalysts are not necessary in growth of the Si3N4 and SiO2 nanowires. High resolution electron microscopy (HREM) and electron energy loss spectrum (EELS) reveal that the Si3N4 nanowire is a single crystal covered by an amorphous SiO2 layer. The growth mechanism is assumed to be a vapor–solid (VS) process.
    Journal of Crystal Growth 12/2001; · 1.55 Impact Factor
  • Jun Liu, X. Zhang, Yingjiu Zhang, Rongrui He, Jing Zhu
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    ABSTRACT: A relatively low-cost, high-efficiency method is reported to synthesize AlN nanowires, using carbon nanotubes as templates. The AlN nanowires were fabricated at 1100 °C, for 60 min. The diameters of the product could be roughly controlled by the sizes of carbon nanotubes selected as starting materials. The AlN nanowires obtained were among the thinnest ever known. X-ray diffraction, selected-area diffraction, energy dispersive spectroscopy, and high-resolution transmission electron microscopy, etc. were employed to characterize the products, which were found to be single crystals with some defects. The axes of the nanowires are normal to {1010} crystal planes. A new synthesis mechanism is proposed.
    Journal of Materials Research. 10/2001; 16(11):3133 - 3138.
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    ABSTRACT: Aluminum nitride nanowires have been synthesized in bulk from carbon nanotubes (CNTs) at relatively low temperatures. This method produces AlN nanowires through the reaction of the carbon nanotubes, Al, and Al2O3 in a flowing NH3 atmosphere. The diameters of the products, mainly in the range of 10−50 nm, correspond with the diameters of the carbon nanotubes, which provides a promising way to control the diameters of the AlN nanowires. The AlN nanowires fabricated in this way are single crystals covered by a thin amorphous layer. The small diameter and single crystal form make the AlN nanowires highly flexible. The growth mechanism of the AlN nanowires and the factors that allow a decrease in the synthesis temperature are discussed.
    ChemInform 09/2001; 13(11).
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    ABSTRACT: Si nanowires and some amorphous SiOx (1<x⩽2) nanowires have been fabricated at ambient pressure by using SiCl4 as Si source and Al2O3 as substrate. The smallest diameter of the Si nanowires is about 10 nm, which therefore makes them the thinnest Si nanowires fabricated by using SiCl4 as Si source. Most of the crystalline Si nanowires are single crystals with an amorphous layer. The axes of the Si nanowires are parallel to or perpendicular to one of the {1 1 1} crystal planes. The parameters affecting the sizes of the Si nanowires are analyzed.
    Journal of Crystal Growth 06/2001; 226(s 2–3):185–191. · 1.55 Impact Factor
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    ABSTRACT: The beta-silicon carbide (β-SiC) nanorods have been synthesized by a floating catalyst method. Iron particles, decomposed from ferrocene vapor while being carried into the reaction chamber by the flowing gases, are very tiny. These small Fe particles act as catalyst to promote the growth of SiC nanorods in the SiCl4–C6H6–H2–Ar system at 1100–1200°C. The diameters of the β-SiC in the products are less than 100 nm, and the SiC nanorods with uniform diameters are single crystals with the stacking faults on the {111} crystal planes.
    Solid State Communications 01/2001; · 1.53 Impact Factor
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    ABSTRACT: A reversible bending phenomenon of Si3N4 nanowires on the conductive carbon–formalin microgrid under an illumination of electron beam was observed using a transmission electron microscope. The nanowires exhibit high flexibility. The bending deflection is approximately proportional to the square of the current density (J) of the electron beam. The bending strength of Si3N4 nanowire is much higher than that of bulk Si3N4 materials. The force that bent the nanowires may be an electrostatic force.
    Journal of Materials Research. 04/2000; 15(05):1048 - 1051.
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    ABSTRACT: GeO2 nanorods have been synthesized by means of a carbon nanotubes-confined reaction, carbon nanotubes are used as templates and pure metallic germanium is a reactant instead of the common-used volatile metal or non-metal oxides. The products are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive spectrometer (EDS) as well as X-ray diffraction (XRD). It is found that the GeO2 nanorods are perfect single hexagonal crystals covered by an amorphous layer of Ge and O, and have diameters of 50–200 nm and lengths of several μm.
    Chemical Physics Letters 02/2000; 317(3):504-509. · 2.15 Impact Factor
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    ABSTRACT: A physical deposition method (PVD) to fabricate one-dimensional nanoscale composites (composite nanowires) based on a coating of carbon nanotubes (CNTs) with tungsten is presented. W vapor evaporating from a W filament is carried by H2 gas to CNTs and deposited along these CNTs. The X-ray energy dispersive spectrum (EDS) and electron energy loss spectroscopy (EELS) analyses indicated that the composite nanowires are composed of carbon and pure tungsten. The diameter of these composite nanowires is not very uniform because the W layers consist of several nanoparticles, as found from a high resolution electron microscope (HREM).
    Solid State Communications 01/2000; 115(1):51-55. · 1.53 Impact Factor

Publication Stats

213 Citations
34.76 Total Impact Points

Institutions

  • 2003–2004
    • National Institute of Advanced Industrial Science and Technology
      • Nanotube Research Center
      Tsukuba, Ibaraki, Japan
  • 2000–2004
    • Tsinghua University
      • School of Materials Science and Engineering
      Peping, Beijing, China