Ming Zhou

Nankai University, T’ien-ching-shih, Tianjin Shi, China

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Publications (11)9.82 Total impact

  • Li-jing Huang · Nai-fei Ren · Bao-jia Li · Ming Zhou
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    ABSTRACT: Aluminium (Al), silver (Ag) and copper (Cu) layers were deposited on commercial fluorine-doped tin oxide (FTO) glass by direct current (DC) magnetron sputtering, so as to form Al/FTO, Ag/FTO and Cu/FTO bilayer films. Then all the as-deposited metal/FTO films were irradiated using a 532 nm nanosecond pulsed laser with a fluences of 1.05 J/cm2. X-ray diffraction (XRD) analysis confirmed that all the laser-irradiated films were annealed by the laser and showed increased average crystallite size in FTO layers. Laser-induced grating structures were also obtained on the surfaces of the laser-irradiated Ag/FTO and Cu/FTO films, resulting in higher surface roughnesses and average transmittances of the films. But due to the broken continuity of the Ag and Cu layers, the sheet resistances of these two films slightly decreased as compared to that of the laser-irradiated Al/FTO film. It was also found that the laser-irradiated Ag/FTO film, whose average transmittance in 400-800 nm waveband and sheet resistance was 81.5% and 6.6 Ω/sq respectively, had the better figure of merit, indicating that the photoelectric property of FTO-based bilayer films could be further optimized through achieving fabrication of laser-induced grating structures and laser annealing in one step.
    No preview · Article · Dec 2014 · Journal of Alloys and Compounds
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    ABSTRACT: Crystalline Co2P is synthesized via a green and effective method based on the reduction of phosphate with KBH4. Various analytical techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy-dispersive spectroscopy instrument are employed to characterize the obtained Co2P. Moreover, it is electrochemically used as an anode material for nickel-based rechargeable batteries and compared with amorphous Co–P prepared by chemical reduction. Co2P electrode presents superior electrochemical properties such as discharge capacities, cycle stability, and rate capability to Co–P electrode. The reversible discharge capacity of Co2P electrode is about 244.1 mAh g−1 at 100 mA g−1 which can be retained after 200 cycles. Co2P electrode also shows promising high rate performance. Furthermore, cyclic voltammogram illustrates that the reversible electrochemical capacity of Co2P electrode is attributed to the redox of Co/Co(OH)2. Electrochemical impedance spectroscopy displays that the charge transfer resistance of Co2P electrode is smaller than that of Co–P electrode.
    No preview · Article · Oct 2014 · Journal of Alloys and Compounds
  • Baojia Li · Lijing Huang · Ming Zhou · Xiaomeng Fan · Ming Ma
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    ABSTRACT: Gold (Au) nanoparticles were prepared on Au-film-coated K9 glass and silicon substrates by direct current (DC) magnetron sputtering and thermal annealing treatment. The effects of substrate material, annealing temperature, and time on morphologies of Au nanoparticles were investigated, and the formation mechanism of Au nanoparticles was discussed. The experimental results indicate that silicon substrate is more suitable for the formation of Au nanoparticles. On a silicon substrate, Au nanoparticles formed with good spherical shapes at temperature over 700 °C. It was also found by spectral analysis that the field enhancement factor of the island-shaped Au particles was smaller than that of the granular Au particles; the better the spherical shape as well as the smaller the size and spacing of Au particles, the higher the light absorption rate; the absorption peak had a red shift with increasing particle size and spacing.
    No preview · Article · Aug 2014 · Journal of Wuhan University of Technology-Mater Sci Ed
  • Baojia Li · Lijing Huang · Ming Zhou · Naifei Ren
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    ABSTRACT: In this paper, we report on the well-aligned zinc oxide (ZnO) nanorods synthesized on Ag buffer layer/glass substrate using a modified hydrothermal method, which adopts the strategy of Ag layer facing down. The effects of position, thickness, and annealing temperature of Ag layer on the shape of ZnO nanocrystals were systematically investigated. It was found that the diameter and length of ZnO nanorods decrease with the Ag layer height up to 12 mm, above which no obvious decrease was observed. Oppositely, the density, diameter, and length of ZnO rods all increase with an increase in the Ag layer thickness, except that the length becomes constant above a critical thickness of 60 nm. In addition, when the Ag layer annealing temperature increases from 300 to 400 °C, the nanorod density decreases, the diameter increases, and the length remains nearly invariable, respectively. Surprisingly, randomly inclined nanorods with two different diameters dispersedly coexist on the Ag layer that was annealed at 500 °C. This work may provide an effective approach for the shape control in ZnO-based applications.
    No preview · Article · Dec 2013 · Journal of Materials Research
  • Xiaofang Xu · Yongfeng Gao · Liu Lv · Ming Zhou · Naifei Ren
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    ABSTRACT: The femtosecond optical pumped transient reflection technique is an effective tool to investigate the ultrafast dynamics in metal thin films. In this paper, both the transient reflectivity response and nonequilibrium relaxation time of electron-phonon interaction in NiFe alloy thin films are studied by using femtosecond laser pump-probe transient reflection experimental technology. The result shows that the heating time of NiFe thin films with different thickness is independent of the thickness of the films, while the thermalization time by electron-phonon relaxation from nonequilibrium state to equilibrium state is proportional to the thickness of the films. In addition, two transient reflectivity signals on glass substrate films are found which is different with previous researches.
    No preview · Article · Oct 2013 · Optik - International Journal for Light and Electron Optics
  • Hua Ding · Run Zhang · Yun Long Wang · Bo Wu · Ming Zhou
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    ABSTRACT: As a new technology in the field of sheet metal plastic forming, Laser peening forming is a new invention which is based on the laser radiation induced shock waves. In the paper, the orthogonal experimental design is adopted to analyze the interaction of different processing parameters with the sample. Laser bending of thin 1060 pure aluminum sheet with the thickness of 0.25mm was studied by changing the laser energy, scanning velocity, and scanning times to understand the effect of process parameters. The results show that the three parameters have different effects on bending angles, scanning velocity ranks first, followed by scanning times and laser power in terms of their effects on the deformation angle.
    No preview · Article · Jun 2013
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    ABSTRACT: Ceramic coatings containing graphite were prepared on Q235 carbon steel by plasma electrolytic oxidation (PEO) in aluminate electrolyte with graphite dispersed in electrolyte. The microstructure and properties of the coatings including phase composition, surface and cross section morphology, thickness and bonding strength were characterized. The results showed that the coating consisted of FeAl2O4, Fe3O4 and a certain amount of graphite. The coating was typically characterized by micro pores and ball-shaped round grains distributed on the surface. With increasing the treating current density, the pores became bigger and the ball-shaped round grains became more. Coatings obtained with various current densities showed a good interface between the coating and substrate. The bonding strength of the coatings decreased a little when increasing the current densities, the values of which were all above 20MPa. The coating grew both inwards and outwards to the substrate surface. With increasing the treating current density, the consumption of substrate gradually increased but the whole thickness was not strongly affected by the current density and the value was about 115 mu m.
    No preview · Article · Dec 2012 · Applied Mechanics and Materials
  • Yongfeng Gao · Ming Zhou · Lingling Xing · Jun Zhou
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    ABSTRACT: In the design process of a novel photonic crystal 1×4 power splitter, the coupling of three parallel photonic crystal waveguides can be considered as a multimode interference system in the two-dimensional square photonic crystal, the positions of output waveguides are decided by the positions of periodic twofold image which are formed by the self-imaging effect of multimode interference. The identical output optical power in each output port of the device can be realized by inserting dielectric rod E and F in the junction between the multimode waveguides and lateral single-mode output waveguides. The transmission characteristics of the splitter are investigated by using the finite-difference time-domain method. The results show that the transmittance of this splitter can be as high as 95.4% for λ=1.55μm when the radius of the inserted dielectric rods of E and F is 0.34r.
    No preview · Article · May 2011 · Chinese Journal of Lasers
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    Yong-Feng Gao · Yun-Tuan Fang · Ming Zhou
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    ABSTRACT: Basing on the effect of photon tunneling, we have studied the transmission prop-erties of a non-symmetrical nonliear cavity through transfer matrix method. It is found that a unidirectional diode-like transmission occurs with this structure. For the same incident fre-quency and incident intensity, while light is at switch-up status for left incidence, the light is at switch-down status for right incidence.
    Preview · Article · Jan 2011
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    ABSTRACT: The design of a novel photonic crystal waveguide power splitter is presented. The proposed power splitter has three output ports, the coupling among three parallel photonic crystal waveguides can be considered as a multimode interference (MMI), and the positions of output waveguides are determined by those of twofold images which are formed by the self-imaging effect of multimode interference. The transmission characteristics of the splitter are investigated by using the finite-difference time domain (FDTD) and the plane wave expansion method. The output optical power in each port can be controlled by adjusting the radius of the dielectric rods in the coupling region, and the coupling effect among output ports is decreased by using the T-shaped output port. The results indicate that 1× 1, 1×2 and 1×3 type power splitters can be realized when the normalized radius of dielectric rods in the coupling region is 0.130, 0.180, 0.152 or 0.221, respectively.
    No preview · Article · Nov 2010 · Optoelectronics Letters
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    ABSTRACT: Periodic microstructures on silicon bulk are formed by the irradiation of the femtosecond laser with the laser wavelength of 800 nm and the pulse length of 130 fs. We investigate the surface periodic ripple structures produced by femtosecond laser treatment. The effects of feedrate of sample, v, on laser-induced surface topography are studied. We find that the femtosecond laser produce periodic ripples of the sub-micron level on silicon surface. At the same time, we realize the optimal conditions to produce these surface structures. When choosing N A = 0.3, and v = 2000 mum/s or 3000 mum/s, we find a series of periodic-structure ripples where the spacing is about 120 nm and the width is about 450 nm. The experimental results indicate that femtosecond laser treatment can produce line arrays on the sub-micron level, which is a positive factor for fabricating grating and other optical applications in nanoscales.
    No preview · Article · Mar 2009 · Chinese Physics Letters