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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    ZnO films growth at different temperature on the substrate of Corning glass by MOCVD

    W. TangX. YangC. WangC. Zhao...
    447-449页
    查看更多>>摘要：We deposited ZnO films on Corning glass substrate by metal-organic chemical vapor deposition (MOCVD). We found the diffraction (002) peak at ～34.46°, indicating that the ZnO thin films were C-oriented. ZnO films were highly transparent with a transmission ratio larger than 85% in the visible range. The surface morphology of the films was observed by atomic force microscopy (AFM).
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Organic photovoltaic cells prepared with toluene sulfonic acid doped polypyrrole

    Fu-fang ZhouChunxu PanYuan Ming Huang
    450-453页
    查看更多>>摘要：Organic photovoltaic cells were fabricated by sandwiching p-toluene sulfonic acid doped conducting polymer polypyrrole between indium-tin-oxide cathodes and aluminum anodes. The active polymeric layers could effectively absorb incident photons more than 75 % in the entire spectral region of 250～1100 nm. Upon light exposure, the short-circuit current and the open-circuit voltage were recorded up to 0.6 μA/cm~2 and 60 mV, respectively, for the organic photovoltaic cells. The dynamics of the generation and decay of the photocurrent and photovoltage in our organic photovoltaic cells were investigated.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on the triode FED device with the improved insulator

    Yukui LiXiaojun Li
    454-457页
    查看更多>>摘要：Carbon nanotubes used as field emitters, the field emission display with improved insulator was reported. The fabrication process of improved gate structure with the mica plate as insulator between gate-electrode and cathode was presented. The technical development in the design of the improved insulator was also given. The patterned silver slurry was used to form the gate electrode and the screen-printed insulation slurry was formed the gate cover layer. The sealed field emission display packaged by the vacuum-device process had been developed and demonstrated. The modulation of electron emission by the gate voltage was also confirmed. The whole flat display device possessed better field emission properties and high brightness.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Growth of ZnO films under different oxygen partial pressures by metal organic chemical vapour deposition

    C. WangX. YangB. LiuC. Zhao...
    458-461页
    查看更多>>摘要：ZnO films were grown under different oxygen partial pressures by metal organic chemical vapor deposition on the substrates of Corning glass. We investigated the quality of the films by SIEMENS D8 X-ray diffractometer. The surface morphology of the films were observed by Digital Nanoscope IIIa AFM with normal silicon nitride tip in the contact mode. The hall effect measurements were carried out with indium ohmic contact. The transmission spectrum of the films were measured. The transmission ratio is larger than 80% in the region above the wavelength of 385nm, and sharply decreased under 10% below the wavelength of 375 nm.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Temperature distribution in focused area of a cell by short pulse laser

    Yawei WangGuangcai HanYing LiuHaina Lei...
    462-465页
    查看更多>>摘要：For studying the effect between short laser pulse and red blood cell (RBC) in a more accurate and powerful way, the light beam characters of a focused femtosecond pulse are studied with a simulation method, and then, a mixed wave-propagating model (MWP) is put forward after analyzing these characters, in which, light beam is thought as propagating in a Gaussian focused shape. In addition, a mathematical processing and linear absorption model in the focused irradiated region of RBC is built based on analyzing its physical mechanism. Finally, the temperature distribution within the RBC is gotten by data simulating calculation, which shows that the temperature variety caused by linear absorption in the focal region is rather small.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on color space conversion model between XYZ and RGB

    Xinwu Li
    466-469页
    查看更多>>摘要：Color space conversion for color digital camera is a key and difficult technique in the color reproduction information optics. A new color space conversion model based on subsectional fitting to correct color conversion error camera image is presented. First, color error sources and color rendering mechanism are analyzed in theory; then the paper takes standard color target for experimental sample and substitutes color blocks in color shade district for complete color space to solve the difficulties of experimental color blocks selecting; third the model uses subsectional fitting algorithm to built three dimension color conversion curve to correct color conversion error; Finally the experimental results show that the model can color space conversion accuracy of color digital camera and can be used in color conversion for digital camera practically.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Influence of annealing process on the magnetic induction effect of FeSiB amorphous alloy ribbons

    Xiao-jun WangXiao-guang Fu
    470-474页
    查看更多>>摘要：The influences of frequency, magnetic field density, importing waveform and annealing process on the rangeability of Fe_(78)Si_9B_(13) amorphous alloy ribbon's magnetic induction effect were studied. The results showed that the rangeability increased with the magnetic field density increased when frequency below 75 kHz, but decreased with the field density increased when frequency over 75 kHz. Compared with quenched ribbons, the rangeability increase after annealed, and the rangeability reached maximum annealed at 300℃ for 1.5 hours. When the input waveform is 75 kHz positive pulse and field intensity is 358A/m, the rangeability the quenched ribbons was 2.27V but it reached to 2.85V after annealed at 300℃ for 1.5hours.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Optical properties and electronic structures of sexithiophene

    Bao-gai ZhaiYuan Ming Huang
    475-478页
    查看更多>>摘要：The optical properties and electronic structures of an organic semiconductor sexithiophene have been investigated with ultraviolet-visible spectroscopy, cw photospectroscopy and time-resolved photospectroscopy, respectively. Sexithiophene in dilute tetrahydrofuran solutions can absorb photons at 400 nm while it can give off strong green photoluminescence at 550 nm under the excitation of 325 nm ultraviolet light. With the assistance of calculated electronic structures and pump-and-probe characterization, our results indicate that both the optical absorption and the light emission of the sexithiophene are controlled by the p-conjugation of the oligothiophene.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Extraordinary transmission through periodic arrays of subwavelength metal by coating

    Guangcai HanYawei WangXiaobin DengLifeng Wang...
    479-482页
    查看更多>>摘要：In this paper, some virtuallab experiments have been done, in which the we get extraordinary transmission phenomenon by adding dielectric coating in the subwavelength periodic metallic slits. It is proved that dielectric coatings on the metal films can excite a surface wave which is transmitted in the metal slits by dielectric waveguides, and the symmetric wrapped dielectric cladding around the metal gains almost 10 times as great transmission as two surfaces cladding does. The paper explores a preliminary physics mechanism of this extraordinary transmission, which gets some valuable results in the application fields.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effect of cis-backbone on optical properties of polyphenylacetylene

    Bao-Gai ZhaiYuan Ming Huang
    483-486页
    查看更多>>摘要：By controlling the temperature of chemical reaction, we synthesized four polyphenylacetylene samples, in which the percentages of cis configurations were determined to be 65, 75, 85 and 100%, respectively. Ultraviolet-visible and fluorescence studies show that the cis-configured backbones have posed significant effects on the optical absorption and fluorescence of the polyphenylacetylenes. Upon the 325-nm excitation, the dilute solutions of these cis-polyphenylacetylenes give off weak fluorescence with their peak located at about 390 nm, but the concentrated solutions of the polymer can give off strong orange-red fluorescence with their peak located at about 600 nm. With Hueckel tight binding theory, both the E-k dispersion relations and the density of states were calculated for cis-polyphenylacetylene. Our results suggest that the blue photoluminescence of polyacetylenes origins from the backbone enhanced π-conjugation of the phenyl chromophors in the polymer, and that intermolecular interactions can occur in the excited complex of the polymer.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd