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Table of Content

    23 January 2011, Volume 29 Issue 1
    The Exciton Fission and the High Efficient Solar Cell
    WU Shi-kang, WANG Peng-fei
    2011, 29(1):  1-10.  DOI: 10.7517/j.issn.1674-0475.2011.01.1
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    The singlet fission compound can be used as a new type of sensitizer for solar cell to increase the photo-electro conversion efficiency tremendously.In this paper,the fundamental point of this phenomenon and its development have been introduced and reviewed briefly,included the experimental method and the mechanism about the fission process.In the part of experiments,the dynamic process of the singlet fission and the recombination of triplet states were described by steady and rapid transient spectrometric method.Simultaneously,the exciton coupling;the energy relationship between different levels,and the environment effect were also discussed.As for the possible mechanism of singlet fission process,several valuable processes were introduced.In addition,some basic guides for the choice of these compounds have been also discussed and explained.
    Preparation of Hg-Doped CdS and Degradation of Toxic Organic Pollutants under Visible Light Irradation
    WANG Pan, CAO Ting-ting, FANG Yan-fen, LUO Guang-fu, LI Rui-ping, HUANG Ying-ping
    2011, 29(1):  11-23.  DOI: 10.7517/j.issn.1674-0475.2011.01.11
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    Mercury doped CdS nanoparticles was prepared by co-precipitation method.The doped CdS nanoparticles were characterized by X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),transmission electron microscope (TEM) and UV-Vis spectrum.The photo-catalytic degradation of Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP) under visible light were used as probe reactions to evaluate photo-catalytic activities by tracing the UV-Vis spectrum and the total organic carbon (TOC) changes.The results indicated that the best mole rate of Hg was 5% of the total metal amounts with the cubic phase crystal,and the band gap of Hg0.05Cd0.95S was 2.15 eV.In 30 minutes,the decolouration of RhB was 100% and the mineralization ratio of RhB was 45.5% in 30 hours,the mineralization of 2,4-DCP was up to 55% in hours with a high stability,the dop of the Hg can efficiently inhibit the photo-corrosion of CdS.The mechanism of degradation were evaluated by electron spin resonance (ESR),the findings showed that the degradation process involved hydroxyl radical course.
    Synthesis of 4-(anthracen-9-yl)-6-(octyloxy)-1,3,5-triazin-2-amine and its Spectroscopic Behavior in Acid Medium
    LI Chun-li, LI Zong-yao, XU Li, HAN Hui, WANG Hua
    2011, 29(1):  24-31.  DOI: 10.7517/j.issn.1674-0475.2011.01.24
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    The synthesis of aminotriazine derivative,4- (anthracen-9-yl)-6- (octyloxy)-1,3,5-triazin-2-amine (AOOTA) was reported in this paper.With 2,4-dichloro-6- (octyloxy)-1,3,5-triazine as starting material,AOOTA was obtained through Kumada coupling and amination reaction in total yield of 38%.Spectroscopic behaviors of AOOTA with HOAc and TFA in chloroform were investigated by UV-Vis absorption and fluorescence spectra.It is found that the dual hydrogen-bonded interaction between AOOTA and HOAc can not be observed at both ground state and excited state.However,the dual hydrogen-bonded complex from AOOTA with TFA can be formed at ground state,but dissociated at excited state due to the rotation of C-C bond (between anthryl group and triazine) and C-O bond (between octyloxy group and triazine).
    Comparison of HDR Image Compression Algorithms
    LIU Zhen, YANG Dan-dan, ZHU Ming
    2011, 29(1):  32-44.  DOI: 10.7517/j.issn.1674-0475.2011.01.32
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    High Dynamic Range (HDR) images are very important method and have been widely used in many areas such as remote sensing,virtual reality,medical images,and cross-media publishing.But the restriction of treatment capability of display and output make it necessary to compress original HDR image before which are outputted in the conventional display and output device.So how to ensure that the best performance of HDR image reproduction is one of the key technologies of HDR image displays.This paper analyzes the mechanism of six high dynamic range image tone compression algorithms which are representative at present.The effect of the HDR image compression algorithms are analyzed and implemented.Then the 6 HDR image compression algorithms are compared by compression test through the subjective and objective evaluation methods.Research results show: compared to other algorithms,image color appearance model based on iCA M06 compression algorithm in HDR image tone compression and reproduce has obvious advantages.
    Acid/Base Controlled Electrochemical Switches Based on Ferrocenyl Imidazole Derivatives
    XIE Nan,, FENG Ke, CHEN Bin, ZHANG Li-ping, TUNG Chen-ho, TONG Zhen-he, WU Li-zhu
    2011, 29(1):  45-53.  DOI: 10.7517/j.issn.1674-0475.2011.01.45
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    A series of ferrocenyl imidazole derivatives were obtained via Radziszewski synthesis,which exhibit an intriguing spectroscopic and electrochemical response upon protonation.In neutral or basic solution,the compounds exhibit low redox potentials representing an OFF state;while in acidic solution,the protonized compounds exhibit high redox potentials representing an ON state;these processes are reversible and can be controlled via the adjustment of acid/base.All these features made these ferrocenyl molecules the promising electrochemical switches.
    Characterization of Metal Ion Doped TiO2 Nanotubes Electrode
    RUAN Xiu-li, SHAO Dong-hai
    2011, 29(1):  54-62.  DOI: 10.7517/j.issn.1674-0475.2011.01.54
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    The Zn2+,Fe3+ and Cu2+ are doped on TiO2 nanotubes electrode using dipping method in this study.The properties of doped TiO2 nanotubes electrode are characterized using some advanced analytic methods.It is found from the images of scanning electron microscope (SEM) and patterns of X-ray diffraction (XRD) that the doped TiO2 nanotubes electrode,whose nanotubes diameter are range from 60 to 100 nm,still remain the original morphology and anatase crystal structure with 101 crystal face.However,the results of UV-Vis diffusion reflectance spectroscopy (DRS) indicate that the initial absorption edges for the three doped TiO2 nanotubes electrodes shift at different degree.Energy band gaps of Zn2+,Fe3+ and Cu2+ doped TiO2 nanotubes are 3.37 eV,3.14 eV and 2.86 eV,respectively.This indicates that the absorption edge of the TiO2 nanotubes doped with Cu2+ is red-shift.
    Portal Hyperspectral Imaging System for Application in Real-Time Detecting Waster-Water
    LIU Hong-ying, LI Qing-li, LIU Jin-gao, XUE Yong-qi
    2011, 29(1):  63-69.  DOI: 10.7517/j.issn.1674-0475.2011.01.63
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    Aim at existing measurement problems of biochemical oxygen demand (BOD),this paper presents a new detection method of waster-water based on hyperspectral imaging technique.The method provides image and spectral information at the same time by the real-time hyperspectral imaging of appointed water area,so it can achieve for BOD qualitative,quantitative and location analysis with appropriate identification method.It is a rapid and simple detection method,which provides a new approach to real-time detection of BOD.
    The Applications of Carbon Nanotubes in Electrical and Optical Nanobiosensor
    HAO Ping, GAO Yun-yan, OU Zhi-ze, LIU Li-hua, WANG Zhong-li, YIN Wei-feng
    2011, 29(1):  70-76.  DOI: 10.7517/j.issn.1674-0475.2011.01.70
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    Carbon nanotubes (CNTs) have attracted great attention in many fields due to their unique physical and electrochemical properties,such as large specific surface area,strong electron transfer capability,good adsorption performance,etc.Immobilization of enzymes,proteins,DNA and other biomacromolecules to the surface of carbon nanotubes can be achieved through covalent and non-covalent interactions,including physical absorption,electrostatic and hydrophobic interactions,which facilitates a direct,fast electron transfer from biomolecules to electrode and can be applied in electrochemical biosensors.On the other hand,carbon nanotubes have recently been applied in the design of optical biosensors.Multiple spectral estimation can be employed to quantitative analysis of the biological molecules,through mesurement of the characteritical Raman spectra and fluorescence emission of CNTs in near IR region.In this paper,the application of carbon nanotubes in the fields of electrical and optical biosensors are reviewed.