30 September 2016, Volume 28 Issue 3
    

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  • Applications of Raman Spectroscopy in Situ Characterization in Organic Optoelectronic Devices
    The Journal of Light Scattering. 2016, 28(3): 195-202. https://doi.org/10.13883/j.issn1004-5929.201603002
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    Raman in situ characterization refers monitoring the process using Raman spectroscopy without destroying the sample in real time, and then characterize the structure and performance change on site orrecord the real-time information throughout the process. Under operating conditions of the devices, examining the chemical and physical structure changes exactly in place where it occurs, will help to insight the relationship between microstructure and photoelectric properties of devices，and then optimize the structure to improve the performance. This review summarizes the in situ observation of film growth, degradation, charged state and their characteristics in organic optoelectronic devices, and finally makes a point on the applications and potentiality of in situ Raman spectroscopy in organic optoelectronic device.
  • Effects of pH on Silver Nanoparticles and Its Interaction with Lysine Studied by Spectroscopy
    The Journal of Light Scattering. 2016, 28(3): 203-208. https://doi.org/10.13883/j.issn1004-5929.201603001
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    The prepared silver nanoparticles synthesized by chemical method was bound with lysine at different pH values. The UV-Vis spectrum and dynamic light scattering methods were used to study the stability of Ag colloids and AgNPs-lysine system. The interaction of Ag nanoparticles and lysine was surveyed by SERS. The results showed at the pH value of 5~10, the UV-Vis spectra appeared strong adsorption peak, the particle size was uniform distribution and DLS intensity auto-correlation curve was smooth, which indicated that the system had good stability. The interaction of lysine binding to Ag nanoparticle surface was investigated by SERS. At the pH value of 4, the SERS band at 1440 cm-1 is assigned to δ (NH3+), and the band of 1576 cm-1 is assigned to δ (COO-) , which tells the lysine adsorbs on the Ag sruface through the interaction of the amino and carboxyl groups together. At the pH value of 10, the main characteristic Raman spectrum was δ（COO-）at 1576 cm-1, it demonstrated that the lysine was adsorbed on the surface of silver nanoparticles with the NH3+ group.
  • Rapid detection of melamine in Milk by Surface-Enhanced Raman Spectroscopy with PVDF Membranes as Supports
    The Journal of Light Scattering. 2016, 28(3): 209-213. https://doi.org/10.13883/j.issn1004-5929.201603003
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    We demonstrate an extremely simple and practical surface-enhanced Raman spectroscopy (SERS) technique for trace melamine detection in milk with PVDF membranes as supports. Through trisodium citrate reduction method, gold nanoparticles with average diameter of 30 nm were obtained. Upon addition to trace-level melamine, gold nanoparticle solution exhibits a highly sensitive colour change from red to blue and rapid aggregation behavior within several minutes. The SERS detection platform was constructed after trapping the mixture of aggregates and melamine on PVDF membrane through a simple filter-based approach, and the lowest detectable concentration was 0.05 mg/L in aqueous solution. Moreover, for the melamine-spiked milk samples, the lowest detectable concentration was 1 mg/L, which could meet the requirement accepted by most countries that the threshold in infant formula was 1ppm. Thus, due to the simple procedure, the low-cost of the substrates and the short total analysis time, our technique enables SERS to be practical for a broad range of analytical applications, including field-based detection of toxins in large volume samples.
  • Characterization of Optical Properties of Wide Band Gap Semiconductor Thin Film with the Combination of Ellipsometry and Infrared Spectrum
    The Journal of Light Scattering. 2016, 28(3): 214-219. https://doi.org/10.13883/j.issn1004-5929.201603004
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    Wide band gap semiconductor films, including silicon carbide (SiC), gallium nitride (GaN), zinc oxide (ZnO) and their compounds and isomers, posess a band gap larger than 3.2 eV, and the characteristic phonon peak lies between 100 and 1500 cm-1. There are many methods to determine the band width and the characteristic phonon peaks, such as photoluminescence, Raman scattering and optical transmission spectra etc. Here we propose a combination of spectroscopic ellipsometry and Fourier transform infrared reflection spectrum analysis by transfer matrix method, which can determine the dispersion spectra and film thickness simultaneously, ranging from ultra-violet (around 250 nm) to far infrared (about 22000 nm). We construct an optical function model based on harmonic oscillator, and demonstrate that the model is suitable for simulating the resonance absorption of incident light with various wavelengths.
  • Optical Properties and Sensing Performance of Hexagram Ag Nanostructure
    The Journal of Light Scattering. 2016, 28(3): 220-225. https://doi.org/10.13883/j.issn1004-5929.201603005
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    The extinction spectrum and sensor properties of the single hexagram Ag nanostructure were investigated. The calculation results by finite-difference time-domain method show that the peak wavelength of the extinction spectrum of hexagram Ag nanostructure has remarkable blueshift and the intensity is gradually weakened when the vertex angle increases from 20° to 140°. Vertex angle has great influence on the refractive index sensitivity, but little effect on the FWHM of the extinction spectrum. The refractive index sensitivity but not FWHM leads to the greatest figure of merit value for LSPR applications when vertex angle is 30°. For the situation with truncated vertices in experiment, analysis of the paper shows that truncation has an effect on extinction characteristics. In addition, the figure of merit gradually decreases with the degree of angle truncation increasing.
  • Inspection of Illegally Added Medicine in Anti-fatigue Health Food by Raman Spectroscopy
    The Journal of Light Scattering. 2016, 28(3): 226-229. https://doi.org/10.13883/j.issn1004-5929.201603007
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    Methods for rapid inspection of illegally added medicine in anti-fatigue health food using Raman spectroscopy is investigated. Raman scattering, superposition of Raman scattering and surface enhanced Raman scattering are combined to get specific Raman signal of samples, and the illegally added medicine can be inspected by comparing the Raman spectra of the samples with those of medicine. Hundreds of samples were inspected and the accuracy is higher than 95 percent, which indicates the method available for the inspection of illegally added medicine in anti-fatigue health food.
  • Analysis of Fingerprint Residues by Micro-Raman Spectroscopy and Spectral Imaging
    The Journal of Light Scattering. 2016, 28(3): 230-236. https://doi.org/10.13883/j.issn1004-5929.201603008
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    Abstract：Oil fingerprints residues on glass slides were examined by confocal Raman spectroscopy. The samples were divided into several groups according to the position and number of characteristic peaks. Meanwhile, corresponding molecular vibration groups were identified for each the characteristic peaks. On the basis of that, Raman imaging was also employed to study oil fingerprints residues on glass slides, so as to obtain the distribution of oil fingerprint ridge substance. The experimental results show that the confocal micro-Raman spectroscopy can be used to distinguish oil fingerprint residues with different components, while the Raman imaging technique can be used to obtain the image and the components of fingerprint simultaneously. It has broad application prospect for the extraction and analysis of oil fingerprint.

  • Comprehensive Observation of Aerosol Scattering Properties in Nanjing
    The Journal of Light Scattering. 2016, 28(3): 237-244. https://doi.org/10.13883/j.issn1004-5929.201603006
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    Analysis of the optical extinction characteristics of aerosol in Nanjing by using the data from the Mie channel of Rayleigh-Raman-Mie Lidar,which belong to the Comprehensive Observation Base of China Meteorological Administration, is presented in this paper. We observed and calculated the optical extinction coefficient of haze from November to December in 2013 by Lidar, and analyzed the optical extinction parameter properties by using the data from CALIPSO level.2. Comparing the inversion results of winter dust in 2012, the results obtained by using CALIPSO and the micro-pluse Lidar are consistent.
  • Comparative Analysis on Black Gel pen Made in China and Other Countries by Raman Spectroscopy
    The Journal of Light Scattering. 2016, 28(3): 245-251. https://doi.org/10.13883/j.issn1004-5929.201603009
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    In order to help the document examiners in their daily work on cases involving black gel pen inks. Comparative analysis was done on 62 black gel pens made in China and 42 black gel pens made in other countries by using Raman spectroscopy technology. It shows that, All of the 104 black gel pens can get their own Raman spectra under 785 nm or 532 nm exciting light.  According to different characteristics of Raman peaks, the 62 black gel pens made in China can be divided into three categories, 42 black gel pens made in other countries can be divided into ten categories. The inks of most black gel pens made in China are carbon, so it is hard to get good distinguish. While the inks of most black gel pens made in other countries are dye, and it is much easier to be distinguished.
  • Application of FTIR Combined with Cluster Analysis in Classification and Identification of Plant Species In The Zingiberaceae Plants
    The Journal of Light Scattering. 2016, 28(3): 252-258. https://doi.org/10.13883/j.issn1004-5929.201603010
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    FTIR spectra from 11 kinds of Zingiberaceae by Fourier transform infrared spectroscopy method combined with the system clustering and correlation coefficient method were used to explore the relationship among the plants. The results show that the cluster analysis is consistent with the results of the correlation analysis, When the distance coefficients of A. kwangsiensis & LSSR was 1 (minimum), the correlation coefficient was 0.950 (highest), phylogenetic relationships recently; 25 (maximum distance coefficient A. blepharocalyx and C. wenyujin), correlation coefficient of 0.005 (minimum), phylogenetic relationships farthest. The study draws that A. kwangsiensis and LSSR, C. xanthorrhiza and A. petaloideum are closely related to species, and supported the independence of C. wenyujin and C. yunnanensis in the classification system, the proposal is divided into separate species. The clustering analysis of the plant species is better, and the correct rate of species identification was 100%. FTIR-cluster analysis can be used as a possible means for the classification and identification of Zingiberaceae.
  • The Research on Thermal and Light-induced Photoluminescence Quenching Effectin Ferroelectric Pure and Cr3+ ion Doped SBN by Time-resolved Photoluminescence Spectroscopy
    The Journal of Light Scattering. 2016, 28(3): 259-263. https://doi.org/10.13883/j.issn1004-5929.201603011
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    The recombination dynamics of photo-excited carrier in ferroelectric ceramic SrxBa1-xNb2O6  was studied by steady state and time-resolved photoluminescence spectroscopy. Under excitation by 395 nmin the absorption edge region，the non-radiative process became faster than the radiative process when the measurement temperatures of Sr0.7Ba0.3Nb2O6(SBN-70) ceramicabove 137 K. This result means that the fluorescence(765 nm) in pure SBN can be easily quenched by phonon, resulting in the excited electrons de-excited to ground state mainly by phonon-assisted non-radiative process but not by photoluminescence.  The thermal activation energy of the fluorescence center in Cr3+ion doped SBN is 380.9±61.0 meV and 374.6±51.4 meV, excited at 395 nm and 480 nm respectively. We have found a strong light-induced luminescence quenching effect in SBN ceramic under low temperature, which may be due to the reabsorption of the photo-induced electron trap states.
  • The Classification of Articular Cartilage with Different Preprocessing Methods based on Principal Component Analysis
    The Journal of Light Scattering. 2016, 28(3): 264-269. https://doi.org/10.13883/j.issn1004-5929.201603012
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    In this paper, different methods were used to preprocess the infrared spectra of healthy and osteoarthritic articular cartilage. And then the principal component analysis (PCA) was applied to classify the articular cartilage samples. First, FTIRI on articular cartilage specimens was achieved. After extracted from the FTIR images, the infrared spectra were preprocessed by baseline correction, normalization, multiplicative scatter correction and standardized normal variate. And then, the original and preprocessed spectra were imported into SPSS software for PCA and the cartilage samples were classified based on the score marix. It is indicated that preprocessing methods combined with the principal component analysis can classify the samples of healthy and osteoarthritic articular cartilage, better. And the result of the combination of different methods is better. In addition, for the cartilage samples, the influence of multiple scatter correction is better than standardized normal variate.
  • Research on Extinction Properties of Localized Surface Plasmon Resonance of Gold Nanoshell
    The Journal of Light Scattering. 2016, 28(3): 270-274. https://doi.org/10.13883/j.issn1004-5929.201603013
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  • The Optical Properties Analysis of Cobalt Nanostructures Based on Discrete Dipole Approximation
    The Journal of Light Scattering. 2016, 28(3): 275-280. https://doi.org/10.13883/j.issn1004-5929.201603014
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    Based on the discrete dipole approximation theory, the optical properties of four kinds of cobalt nanostructures were simulated. The parameters that are the radius of cobalt nanoparticle, the atom ratio of cobalt-gold alloy, the thickness of core and shell of cobalt@gold core-shell structure, the size of hollow cobalt particles affect the extinction spectra of these structures, which were discussed. The results show that the cobalt nanoparticle with 50 nm radius has the maximal extinction efficiency; moreover the scattering efficiency excels its absorption. The extinction efficiency of hollow cobalt nanoparticle red shifts compared to that of the solid particle, and it has the maximal efficiency spectrum located at the visible region when the inner radius equals to 40 nm and the shell thickness is 5 nm. The cobalt-gold alloy with atom ratio 1 has a broad scattering spectrum in the range of visible region. The extinction spectra of cobalt@gold core-shell structure nanoparticles change from two peaks to one peak with a wider half-peak width when the thickness of the core or shell is increased. The property of cobalt@gold core-shell structure depends on the interaction of core and shell metal. These results can provide some suggestion for choosing the structural parameters in practical application, such as solar energy field.
  • Circularly Polarized Luminescence Spectroscopy of Chiral Amino Alcohols   Probe Detected via Achiral Europium(Ⅲ) Complex
    The Journal of Light Scattering. 2016, 28(3): 281-284. https://doi.org/10.13883/j.issn1004-5929.201603015
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    Circularly Polarized Luminescence (CPL) is one of chiroptical spectroscopy methods to characterize chiral molecules. However, the direct detection by CPL needs chromophore, which limits the development of CPL. In this paper, an achiral europium(Ⅲ) complex was used as probe molecule to study chiral properties in CPL. It is shown that: chiral amino alcohols can interact with the achiral europium(Ⅲ) complex Eu(fod)3 and produce induced CPL signals (ICPL). The ICPL signal exhibit high glum value and the sign was relevant with the chiral structure of the amino alcohols. Meanwhile, the glum value varies with different structures of amino alcohols. The result suggest that the indirect approach by using Eu(fod)3 as probe molecule to detect chiral amino alcohols is an effective method.
  • Optical Transmission Properties of Asymmetric Bowtie Nano-Aperture Array
    The Journal of Light Scattering. 2016, 28(3): 285-292. https://doi.org/10.13883/j.issn1004-5929.201603016
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    We investigated the optical properties of two different asymmetric bowtie nano-aperture (BNA) structures using numerical simulation. For the BNA with its gap displaced, the fundamental resonance is in linear relation with aperture perimeter. And different gap sizes show different sensitivity to gap displacement. For the BNA with one edge geometrically modified, the fundamental resonance can be tuned in linear fashion by changing one geometrical parameter (the height of the remaining part h2). Furthermore, peak splitting of Fabry-Perot-like resonance can also be observed in the study. Both approaches we propose in this work to break the symmetry of BNA can be used flexibly to manipulate the resonances of BNA structure.
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