Qingping Ding

University of Electronic Science and Technology of China, Hua-yang, Sichuan, China

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Publications (7)11.72 Total impact

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    ABSTRACT: String-like ZnS/SnO nanowire/nanosheet hierarchical nanoheterostructures were synthesized by a two-stage vapor transport and condensation method. X-Ray diffraction, scanning electron microscopy, and transmission electron microscopy were used to characterize and analyze the as-synthesized products. The results indicated that the synthesized products consisted of numerous rectangular single crystalline SnO nanosheets threaded by single crystalline ZnS nanowires. A growth mechanism for the growth of the string-like nanoheterostructures has been proposed. Room temperature photoluminescence properties of the nanostructures were investigated. Both the emissions from ZnS nanowires and SnO nanosheets were observed in the PL spectrum of the string-like nanoheterostructures. These special heterostructures may find applications in nanoelectronic and photonic devices.
    CrystEngComm 10/2012; 14(23):8063-8067. · 3.88 Impact Factor
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    ABSTRACT: We present here a systematic study on the synthesis of various ZnO nanostructures by electrodeposition method with ZnCl2 solution as starting reactant. Several reaction parameters were examined to develop an optimal procedure for controlling the size, shape, and surface morphology of the nanostructure. The results showed that the morphology of the products can be carefully controlled through adjusting the concentration of the electrolyte. The products present well-aligned nanorod arrays when the concentration is low. However, they act as anomalous hexangular nanoplates when the concentration of ZnCl2 is higher than 5 mM. Transmission electron microscopy and select area electron diffraction results show that the product presents good crystallinity. A possible formation process has been proposed.
    Journal of Nanomaterials 01/2010; · 1.55 Impact Factor
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    ABSTRACT: In this study, we have investigated effective refractive index (ERI) and power confinement factor (PCF) in single nanobelt and coupling between two parallel nanobelts using finite-difference time-domain (FDTD) method. As the width of nanobelt increases, both the effective refractive index (ERI) and power confinement factor (PCF) are increased till the saturation values. The ERI changes linearly with refractive index in our simulation range, while the PCF shows nonlinear characteristic. The coupling length (LT) between two nanobelts is much shorter than that in weakly coupled waveguide, which may find applications in solving the cross talk problem. Nanobelt behaves like slab waveguide when the width becomes big enough.
    Physics Letters A 01/2009; 373(23):2061-2064. · 1.77 Impact Factor
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    ABSTRACT: PrFeAsO0.75 was prepared at 900 °C using the solid state reaction method which shows no superconductivity and a strong resistivity anomaly at 150 K. The resistivity anomaly was usually ascribed to the spin density wave (SDW) instability. After further treatment under a high pressure of 6 GPa at a temperature of 1300 °C for 2 h, the resistivity of PrFeAsO0.75 is two orders lower than that before treatment and a superconducting transition is observed.
    Superconductor Science and Technology 10/2008; 21(12):125018. · 2.76 Impact Factor
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    ABSTRACT: Superconductivity with Tc of 45 K was realized in the tetragonal ZrCuSiAs-type PrOxFeAs (x=0.75) under heat treatment of 1300 oC and pressure of 6 GPa for 2 hours. Although the sample prepared at 900 oC in vaccum possessed the same phase as that treated in pressure, the electrical transport measurement showed the similar behavior with its parent ReOFeAs (Re: rare-earth metal). This pressure-induced superconductivity could give us a hint to understand the origins of the newly-found iron based superconductors.
    07/2008;
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    ABSTRACT: As low as 900 oC, iron-based layered quaternary compound NdFeAsO0.75 was synthesized through solid state reaction method. XRD measurements illustrate almost pure phase of tetragonal phase NdFeAsO was formed. The synthesis temperature in our experiment is the lowest among all the reported methods without the help of any mineralizer. After further treatment under high pressure of 6 GPa at temperature of 1300 oC for 2 hours, the electrical transport property of NdFeAsO0.75 was transformed from insulator-like to metal- like behavior.
    07/2008;
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    ABSTRACT: Enhanced photoluminescence (PL) phenomena have been observed at the ends/junctions of the hexagonal ZnO micro-rods prepared from zinc grains by the thermal evaporation method. In order to study the origin of the phenomena, finite difference time domain (FDTD) method was employed here for simulation. This enhanced PL was analysed to be attributed to the waveguide effect, and a good agreement with the enhanced PL phenomena was obtained.
    Physics Letters A 01/2007; 365(1):175-179. · 1.77 Impact Factor

Publication Stats

5 Citations
11.72 Total Impact Points

Institutions

  • 2010–2012
    • University of Electronic Science and Technology of China
      • School of Physical Electronics
      Hua-yang, Sichuan, China
  • 2007–2009
    • Nanjing University
      • Department of Physics
      Nanjing, Jiangsu Sheng, China