31 December 2016, Volume 28 Issue 4

    

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  Silver Nanoparticles Preparation and Its Sers Study for Detection of BPA

  The Journal of Light Scattering. 2016, 28(4): 293-296. https://doi.org/10.13883/j.issn1004-5929.201604004

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  Silver nanoparticles were prepared as SERS substrate to test BPA. Coagulator-NaCl was added to study the effect on SERS. The results showed that obvious SERS signal was gotten while the concentration of BPA in ethanol was as low as 10^-7 g/mL. And due to the simple procedure in sample preparation and pretreatment, this method shows great application potential in rapid test for BPA.
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  Rapid Detection Drugs in Urine by Surface-Enhanced Raman Spectroscopy

  The Journal of Light Scattering. 2016, 28(4): 297-301. https://doi.org/10.13883/j.issn1004-5929.201604005

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  The drugs was rapidly separated and purified in human urine sample by pretreatment. Furthermore, the self-assembled gold nanorods were used as the substrate to detect the drugs in real purifiedhuman urine byportable Raman spectrometer. It was found that our substratepresent excellent sensitivity of methamphetamine (MAMP), 3,4-methylenedioxy-methamphetamine (MDMA) and methcathinone(MCAT) detection.The whole process of the purifiedand detected procedurecan be completed in ~3.5 min.Therefore, our platform for detecting drugs promises a great prospective towards a rapid, reliable and on-spot detection method.
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  Noble Metal Nanostructures Assembled Tapered Fiber Probes and Their SERS Performance

  The Journal of Light Scattering. 2016, 28(4): 302-307. https://doi.org/10.13883/j.issn1004-5929.201604006

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  The integration of plasmonic nanostructures with portable fiber Raman spectrometer shows great potential in real time detection of remote liquid samples and in-vivo species. In this system, the surface enhanced Raman scattering (SERS) active noble metal nanostructures are required to bind on the fiber surface to generate stable SERS signals toward the target species. Herein we show that by using thiol-terminated silane couple agent (3-mercaptopropyl trimethoxysilane) which can be decorated on the silica surface of fiber probe, SERS-active Au nanospheres and Au nanocubes can be stably assembled on the fiber surface through the readily formed Au-S and Ag-S covalent bond. The resultant SERS fiber probes demonstrate high signal reproducibility (relative standard deviation lower than 3%) and can be sensitive to 10^-8 M methyl parathion, showing potentials in SERS-based online and portable detection of liquid samples.
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  Study on Enhancement of Stimulated Raman Scattering in Acetone by Au Nanoparticles

  The Journal of Light Scattering. 2016, 28(4): 308-311. https://doi.org/10.13883/j.issn1004-5929.201604002

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  Stimulated Raman scattering (SRS) has been an important method in the tunable laser frequency since it has the characteristics of the laser beams and easily acquires different wavelengths. However, the practical application of SRS is limited because of its low conversion efficiency. Metal nanoparticles have been widely used in the surface-enhanced Raman scattering (SERS) as they have very strong surface enhancement effect. In this article, metal nanoparticles are employed to improve the conversion efficiency of SRS. Au nanoparticles are mixed in the Raman medium acetone, and the nanosecond pulse laser of 532 nm is used as the pump source of the SRS. The first Stokes intensity of the SRS evolving with the concentration of Au nanoparticles in acetone is studied, and the experimental results are explained and analyzed by simulated calculations.
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  In Situ High Pressure Raman Study of Sodium Azide

  The Journal of Light Scattering. 2016, 28(4): 312-316. https://doi.org/10.13883/j.issn1004-5929.201604007

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  Sodium azide (NaN₃) has been investigated by high pressure Raman scattering spectrum and theory calculation. Three pressure-induced phase transitions were observed. The phase transition pressures were determined to be 0.4, 14.1, and 27.3 GPa, respectively. In the process of the phase transition, the librational vibration mode of N₃⁻ (Eg) splits to Ag and Bg and charge transfer was observed between N₃⁻. The pressure induced-phase transition route is β-NaN₃→α-NaN₃→γ-NaN₃→δ-NaN₃. This study confirms the previous XRD study.
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  Synthesis and Raman Spectral Analysis of Solid-Solution Series of Jarosite Group

  The Journal of Light Scattering. 2016, 28(4): 317-323. https://doi.org/10.13883/j.issn1004-5929.201604008

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   In this paper, the solid-solution series of the jarosite group AFe₃(SO₄)₂(OH)₆ have been synthesized, where the site of A can be occupied by K⁺, Na⁺ and H₃O⁺. In addition, nearly fully occupied potassium jarosite is prepared for comparison. Raman spectra of the jarosite group are measured and analysized. The jarosite group minerals can be characterized by Raman spectra and the bonds can be due to the hydroxyl groups, internal modes of sulfate and lattice modes. Some bonds assignment which are open to question are analysized. According to the number of the scattered peaks and frequencies, the size of the ionic radius, bonds length and bonds angle, the effect of the substitutions of ions in A-site of jarosite solid solution series is analysized by hooke's law.  The substitution effect of A position ion mainly affect the OH in the jarosite and the hydroxyl vibration mode.
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  Structure Characterization and UV Raman Study on Ce_xPd_1-xO_2-δ  Nanocrystallines Prepared by a Sol-Gel Method

  The Journal of Light Scattering. 2016, 28(4): 324-329. https://doi.org/10.13883/j.issn1004-5929.201604001

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  A series of nanocrystallines with general formula Ce_xPd_1-xO_2-δ （x=1, 0.7, 0.5, 0.3）were prepared by a sol-gel method. The nanocrystallines were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), high resolution transmission electron microscopy(HRTEM) and Raman Spectroscopy. XRD results showed the crystallines phase was cubic phase。XPS results showed that the valence states of Pd contained Pd⁴⁺，Pd²⁺ and Pd⁰, and the presence of Pd⁴⁺ showed that the structure of solid solution was formed. HRTEM images、XRD profiles and Raman spectra indicated that the doped-CeO₂ complexes contained PdO. The HRTEM images showed that there were some Pd distributed on the surface of CeO₂, which indicated the formation of solid solution and then high temperature resulted in the precipitation of Pd from the lattice . The normalization result of visible Raman(λex=532 nm) and UV Raman(λex=325 nm）showed that F2g peak became more obviously in the UV Raman spectra. At the same time, other three peaks were observed at 593 cm^-1，1170 cm^-1 and 1750 cm^-1 in the spectrum, which belong to longitudinal optic(LO), 2LO and 3LO respectively. The F_2g peak along with LO band activation detected here was due to the resonance Raman effect. UV Raman spectra of CeO₂ nanocrystals doped with different amout of Pd showed that the concentration of oxygen vacancies increased gradually with the increase of Pd content, and this was consistent with the trend of XPS test.
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  Study the  ν2～ν3+ν4   Fermi Resonance of CH₃CN

  The Journal of Light Scattering. 2016, 28(4): 330-333. https://doi.org/10.13883/j.issn1004-5929.201604009

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  Raman spectra of CH₃CN and CD₃CN were measured at ambient pressure and room temperature. The new Fermi resonance theoretical model, which was built based on the perturbation theory, was used to calculate the parameters of   ν2～ν3+ν4  Fermi resonance of CH₃CN with isotopic substitution method. In addition, we also compared the calculation results with the new theoretical model and the Bertran equations. The new theoretical model can be used not only to calculate the original intensity of the Fermi doublet, but also to calculate the frequencies of the Fermi doublet in absence of the Fermi resonance with the transition dipole moments of the two observed transitions. Besides, we also gave a detailed analysis on the difference between the calculated results based on the Bertran equations and the calculated results in the present work. 
   
   
    
    
    
    
    
    
    
    
    
    
    
    
   
   
   
  
  
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  Fermi
  resonance of CH₃CN with isotopic substitution method. In addition,
  we also compared the calculation results with the new theoretical model and the
  Bertran equations. The new theoretical model can be used not only to calculate
  the original intensity of the Fermi doublet, but also to calculate the
  frequencies of the Fermi doublet in absence of the Fermi resonance with the
  transition dipole moments of the two observed transitions. Besides, we also
  gave a detailed analysis on the difference between the calculated results based
  on the Bertran equations and the calculated results in the present work.
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  The Study of Raman Spectroscopic Technique on the Identification of Pigment

  The Journal of Light Scattering. 2016, 28(4): 334-338. https://doi.org/10.13883/j.issn1004-5929.201604003

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  10 kinds of pigment were tested by laser Raman spectroscopy, and we classify the obtained experimental data into six categories though Raman peaks. Through the experiment, it is found that the pigment producted by domestic and foreign are different, the same domestic manufacturers of different types of seal pigment vary from each other, different manufacturer’s pigment components have the same. Raman spectroscopy can effectively detect pigment material seals which contain big red or bronze red. The setting of various parameters has great influence on the experimental data. Using the method of control variables, we analysis the influence of the sample itself, the experimental environment, experimental conditions, parameter settings and other factors.
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  Raman Spectrum Calculation and Analysis of Peramivir Trihydrate

  Zhang Minshan,CAI Hongxing*,Tan Yong,Xin Minsi,Miao Xinhui

  The Journal of Light Scattering. 2016, 28(4): 339-345. https://doi.org/10.13883/j.issn1004-5929.201604010

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  In order to provide the need for the identification Peramivir Trihydrate by the raman.In this paper,we used the micro raman spectrometer to detect the natural raman spectrum of the standard Peramivir Trihydrate,we also used Density Functional Theory method optimized two kinds isomers molecular structure and given theoretical raman spectrum of Peramivir Trihydrate. We propose a function to recognition raman spectrum by what their feature frequency determine,through the correction, we obtain a better theoretical spectrum.Finally, the vibration mode of the characteristic peaks of the measured spectra is analyzed.
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  Eu³⁺ and Sm³⁺ ions doped Y₂MoO₆ phosphors for WLED under near-UV excitation: synthesis and optical properties

  ZHAO Zhi 1, SUN Xiaoyu 2, ZUO Jian 1

  The Journal of Light Scattering. 2016, 28(4): 346-351. https://doi.org/10.13883/j.issn1004-5929.201604011

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  Eu³⁺，Sm³⁺ doped Y₂MoO₆ red and orange phosphors have been prepared by a sol-gel method. The crystals structure, morphologies and optical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence emission spectra (PL), excitation spectra (PLE) and decay curves (lifetime) respectively. XRD results imply that the obtained samples are of monoclinic structure with C2/c space group and no extra phases are observed. The sample size of sub-micrometer is shown in SEM images. The samples can absorb near UV light efficiently confirmed by PLE spectra and reveal excellent red and orange emissions. Furthermore, the luminescence mechanism, the effect of concentration quenching and the CIE chromaticity coordinates are discussed in detail. These phosphors will have potential applications in phosphor-converted WLEDs for the excitation of near UV light. 
  
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  Fourier Transform Attenuated Total Reflection Two-dimensional Infrared Spectroscopy Study of Polyethylene Terephthalate C=O Stretch Vibration

  The Journal of Light Scattering. 2016, 28(4): 352-359. https://doi.org/10.13883/j.issn1004-5929.201604012

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  The C=O stretch vibration (ν_C=O) of the polyethylene terephthalate (PET) had been studied by fourier transform attenuated total reflection infrared spectroscopy (ATR-FTIR) and ATR two-dimensional infrared spectroscopy.The νC=O occurred respectively near 1700 cm^-1, 1709 cm^-1 and 1718 cm^-1(below glass transition temperature), and the sequence of ν_C=O intensity changes was 1709 cm^-1> 1700^-1 > 1718 cm^-1 with the increase of temperature (313 -343 K). But the ν_C=O were observed near 1709 cm^-1 and 1718 cm^-1(above glass transition temperature), and the sequence of ν_C=O intensity changes was 1718 cm-1>1709 cm-1 with the increase of temperature (353 -393 K). The paper demonstrated the key roles of ATR two-dimensional infrared spectroscopy in the analysis of thermal denaturation of the PET.
  
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  Laser Trigger Weakly Coupled Plasma Ionization Order with Spectroscopy

  LI Xin，LV Meng

  The Journal of Light Scattering. 2016, 28(4): 360. https://doi.org/10.13883/j.issn1004-5929.201604013

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  Laser trigger weakly coupled plasma in the ultrafast time (10 ~100 fs), modalities and mechanisms to generate ions has been a very difficult problem to ascertain and calculate.Using laser Ionization atoms basic characteristics, find out all the ionization path producing ions which produce ionizing X-ray at the same time, mark and study them. Combined with the nature of the level shift of atoms or ions in the weakly coupling plasma environment. Compare and calculate the method of different ionization which in the same results under the same path. We can distinguish the different ionization order with the same product. A list is given by the calculation and the corresponding characteristic X-ray spectra generated to determine the production process within 10 ~ 100 fs ions as well as mechanisms, ionization path and method of producing ionizing order. Laser-matter interaction physics study provides a detectable technology in short time (10 ~100 fs).
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  Preparation and Optical Properties of Cu₂ZnSnS₄ Powders by Solvothermal Method

  LIU Lihua, LIU Jiuyang, TAI Xin, DONG Lirong, HUA Zhong

  The Journal of Light Scattering. 2016, 28(4): 364. https://doi.org/10.13883/j.issn1004-5929.201604014

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  Cu₂ZnSnS₄（CZTS）powders were synthesized at lower temperature by solvothermal method in ethylene glycol with metal chloride as metal precursors, thiourea as sulfur source, and polyvinylpyrrolidone(PVP) as surfactant. The crystal structures and morphology of the samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, Scanning Electron Microscope (SEM), and Transmission Electron Microscopy (TEM). The optical properties of the samples were investigated by UV-Vis spectrum（UV-Vis）. The results indicate that kesterite CZTS particles were prepared at 180 ℃ for 25 h. Under this condition, the microspheres with flower-like surface were obtained. The diameters of the microspheres were about 2.5 μm for the sample prepared at 0.2 g of PVP in the reaction system. While the diameters of the microspheres were about 1.1 μm for the samples prepared at 0.3 g, 0.4 g and 0.5 g of PVP. The sample prepared at 0.4 g of PVP was more disperse and possessed an obvious absorption in the visible region. The band gap is estimated to be about 1.45 eV by extrapolation. Such a band gap is close to the optimum band gap for solar cell.
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  The Study of Temperature-dependent Photoluminescence of the SiO₂/Si Structures after Swift Heavy Ion Radiation

  The Journal of Light Scattering. 2016, 28(4): 369-373. https://doi.org/10.13883/j.issn1004-5929.201604015

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  In this work, the study of optical property of the SiO₂/Si structures were performed before and after swift heavy ion radiation. The Sn ions with the energy of 414 MeV and different fluence were chosen to irradiate the SiO₂/Si structure with oxide thickness of 36 nm and 90 nm at room temperature. The photoluminescence (PL) spectrum of the SiO₂/Si structure were obtained at different test temperature. With the changing of the fluence, the PL peak moved and the intensity of the PL band changed at the same test temperature; at the same fluence, the PL peak moved with the changing of the test temperature. A new PL band were obtained at 80 K due to the light emission of bound exciton.
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  Also Talking about the Enhanced in Light Scattering

  The Journal of Light Scattering. 2016, 28(4): 374-390. https://doi.org/10.13883/j.issn1004-5929.201604016

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  ‘Enhancement phenomena’ in light scattering were found at 1970s. It is an importance phenomenon for (especial inelastic) light scattering.Up to now, it had been expended a huge effort and funds in this phenomena studies, or for more best explain away these results during the past more ten years. Recently, it had been pushed on the new place by super-high enhancement(g is the enhanced factor ~10^14-15)phenomena,andfor this sort of problems, experimental results, must deal with by using new idea or scattering crosses section. There aredetails given a few of machines about facility-pole of Green’s function, polarization, nanoparticles,nanolens, quasiphase-matching, single-molecule and interface layer or the boundary etc., which are unable understanding during the past a few decade. Except fundamental knowledges of light scattering intensity have been presented, for the new fields should been given too, for their research in further in this talking.