30 June 2018, Volume 30 Issue 2
    

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  • Surface-Enhanced Raman Spectroscopy Combined with Stable Isotope Probing to Study Nitrogen Assimilation by Microorganisms
    The Journal of Light Scattering. 2018, 30(2): 97-102. https://doi.org/10.13883/j.issn1004-5929.201802001
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    Nitrogen is an essential nutrient element sustaining all life forms. Environmental microorganisms play an important role in biogeochemical cycle of nitrogen. However, because a large majority of environmental microorganisms are uncultured, our knowledge on them is very limited. Here, by combining surface-enhanced Raman spectroscopy (SERS) with 15N stable isotope probing, obvious 15N-induced band shifts in SERS spectra of bacteria were identified. Bands shifted linearly with 15N percentage in media, providing a way to study extent of nitrogen assimilation or activity of bacteria. The selective enhancement of SERS on N-related biomolecules accounted for the presence of indicator bands. Finally, SERS band shift induced by 15N, 13C and deuterium were compared and the results indicated that 15N induced a larger shift than deuterium. The reason is related to the position of N and H in the ring structure of adenine.
  • Photocatalytic Study on Graphene
    The Journal of Light Scattering. 2018, 30(2): 103-106. https://doi.org/10.13883/j.issn1004-5929.201802002
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    Graphene is a new type of nano-material with unique 2D planar structure and excellent conductivity, large specific surface area and high temperature resistance. It is widely used in the field of physical chemistry. In this paper, single-layer graphene was prepared by chemical vapor deposition (CVD). Graphene and silicon were used as the catalytic surface. The surface catalytic reaction of 4-nitrobenzenethiol (4NBT) molecule was investigated by Surface Enhanced Raman Scattering. The results show that graphene has good photocatalytic properties.
  • A New SERS-Based Method of Screening Volatiles for Researching the Classification of Allium
    The Journal of Light Scattering. 2018, 30(2): 107-114. https://doi.org/10.13883/j.issn1004-5929.201802003
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    This work put forward a fast, effective and SERS-based volatiles screening method for identification and classification of 17 Allium species. Nano-silver colloid was used as substrate to detect volatiles Surface-enhanced Raman scattering (SERS) spectra of different parts of the same species. Results showed that peaks positions of their SERS spectra were essentially the same, only the relative intensity of some individual peaks changed; the repeatability of silver colloid produced in different years was very well. Then, volatiles SERS spectra of 17 Allium species were detected, their SERS spectra can be divided into three groups: 1-Propanethiol enhanced group, Diallyl disulfide enhanced group and Allyl methyl sulfide enhanced group. The multivariate statistical analysis was performed on the volatiles SERS spectra of 17 Allium species and results confirmed that the 17 species were divided into the same three groups as mentioned above. All above results conclude that SERS-based method of screening volatiles can provide new reference information for discriminating Allium.
  • SERS Rapid Detection of Drugs in Urine of Suspected Drug Addicts Based on Portable Raman Spectrometer
    The Journal of Light Scattering. 2018, 30(2): 115-119. https://doi.org/10.13883/j.issn1004-5929.201802004
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    This article is the use of SERS technology for rapid detection of drugs in urine of suspected drug addicts based on portable Raman spectrometer.The rapid detection and purification of the drugs in the urine, combined with portable Raman spectrometer, and the use of self-assembled gold nanoparticles as SERS substrate for analysis, can be achieved on-site testing. The method with high sensitivity, detection speed, is expected to be applied to the public security and judicial departments of the anti-drug scenes.
  • Chemical Enhancement of Raman Signals of Furfural Molecules by Coin Group Metals
    The Journal of Light Scattering. 2018, 30(2): 120-125. https://doi.org/10.13883/j.issn1004-5929.201802005
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    In this work, the Raman of individual furfural molecule and SERS of furfural-Mx (M=Ag, Au, Cu) complexes are investigated through density functional theory (DFT). In Raman spectrum of individual furfural molecule, the vibration mode of each Raman peaks is figured out and the deviation to experimental data is analyzed by surface charge distribution. In SERS of furfural-Mx complexes, the influence of atom number and species on SERS chemical enhancement factors (EFs) have been studied, which is further analyzed by charge transfer effect. Our studies strengthen the understanding of charge transfer effect in SERS of furfural molecule.
  • In-situ Studies on Na2TiO3 and Its Phase Transformation by High Temperature Raman Spectroscopy and High Temperature XRD method
    The Journal of Light Scattering. 2018, 30(2): 126-132. https://doi.org/10.13883/j.issn1004-5929.201802006
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    In this paper, the synthesis conditions of α, β and γ phases of Na2TiO3 crystal were designed. Three crystal of different phases of Na2TiO3 were prepared successfully by solid-state reactions. Room temperature Raman spectra and X-ray diffraction (XRD) patterns of these crystalline samples were then recorded. The assignment of the major Raman-active vibrational modes of γ-Na2TiO3 in high-frequency region was made on the basis of density functional theory (DFT) calculation. In-situ high temperature both Raman spectroscopy and XRD method have been adopted to investigate temperature dependent phase transition and micro-structural evolution of the disordered metastable crystalline α-Na2TiO3. This work can offer experimental basis for the structural evolution and crystal phase identification of various crystals of Na2TiO3.
  • Study on Anisotropic Properties of 4H-SiC by Polarized Raman Scattering Spectroscopy
    The Journal of Light Scattering. 2018, 30(2): 133-138. https://doi.org/10.13883/j.issn1004-5929.201802007
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    Using the backscattering polarization configuration, the angle variations of the Raman scattered intensities of allowed phonon modes were measured for the 4H-SiC thin film grown on the semipolar a-plane (1120) and the intensity properties were investigated. According to the Raman selection rules, the Raman tensor elements of allowed phonon modes have been extracted by data fitting and the anisotropic characteristics of 4H-SiC were explored. The results provide a further understanding of the microstructure and anisotropy of 4H-SiC crystal.
  • A New Fingerprint Imaging Technology Based on Au Nanoparticles
    The Journal of Light Scattering. 2018, 30(2): 139-142. https://doi.org/10.13883/j.issn1004-5929.201802008
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    Fingerprint carries human special information, which is one of the most important individual characteristics. The technology of fast and clear fingerprint recognition and extraction is of great significance to criminal detectives, public safety and other fields. Metal nanoparticles have strong scattering effect in the dark field of light, and this paper studies the fingerprint imaging using the scattering characteristics. Under the dark field imaging system, with the combination of fingerprint and metal nanoparticles, the scattering properties of metal nanoparticles show fingerprint minutiae. This characteristic provides a new strategy for fingerprint extraction. This method can realize fast and simple fingerprint information extraction and avoid the destruction of fingerprint details by the chemical method.
  • Specific Determination of Trace Amount of Glucose in Urine Based on Cyanophenylboronic Acids Probe#br#
    The Journal of Light Scattering. 2018, 30(2): 143-149. https://doi.org/10.13883/j.issn1004-5929.201802009
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    The quantitative detection of glucose in urine with high sensitivity and specificity is of great significance in clinical diagnosis. This work utilized 4-Cyanophenylboronic acid (4-CPBA) as a secondary carbohydrate probe in a surface-enhanced Raman spectroscopy (SERS) -based urine glucose quantification assay. This assay protocol does not require the conjugation of the probe to the SERS substrate. Furthermore, the characteristic Raman peak of cyano group at 2226 cm-1 was located in the biological silent region (1800-2200 cm-1), thus avoiding interference by other endogenous biological molecules. This method allows high selectivity of glucose over other carbohydrate such as fructose and galactose. This method has been successfully applied for specific detection of urine glucose，with the detection limit down to 10 nM. Furthermore, the glucose content in urine from patients with mild diabetes was successfully detected. The experimental results show that this method offers a highly specific and sensitive way for the determination of glucose in urine，as a potential powerful tool for subsequent quantitative analysis.
  • Analysis and Study of the Tangka of Xixia Thousand Buddha Niches
    The Journal of Light Scattering. 2018, 30(2): 150-155. https://doi.org/10.13883/j.issn1004-5929.201802010
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    Tangka of Xixia Thousand Buddha Niches, at an age of Xixia period, had been unearthed in 1963, the surface pigment paint of which was analyzed by polarizing microscope and laser Raman spectrometer carefully. The conclusion revealed that the red paint was made by the mixture of cinnabar and minium; the red on the background came to cinnabar; the blue was showed to be indigo; the white was confirmed as white lead; and the black was carbon black. The analysis result provided scientific information, which could make a significant impact on the protection and restoration of Tangka, and which could lead us to choose available paint when protecting and restoring this cultural relic.
  • Detection of Drugs by Raman Spectroscopy and Data Analysis Based on R Software
    The Journal of Light Scattering. 2018, 30(2): 156-162. https://doi.org/10.13883/j.issn1004-5929.201802011
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    Several drugs of abuse are detected by micro Raman spectroscopy.  Isomers (ketamine and hydroxyl imine), homologues (synthetic cannabinoid JWH-018 and JWH-073) are distinguished by Raman spectroscopy. Meanwhile, the content of each component in an ecstasy sample with unknown composition is examined by Raman spectroscopy combined with R software. In addition, drug particles deposited on different types of fingerprints are tested by Raman spectral imaging. The experimental results show that taking the advantages of its rapid, nondestructive and needless of pretreatment, Raman spectroscopy is an effective method to analyze different kinds of drugs to distinguish Samples with similar molecular structure. Moreover, the distribution of drug particles in the fingerprint can be obtained combining micro Raman spectroscopy with Raman imaging technique, which has a good application prospect in the inspection of material evidence at the scene of crime.
  • Analysis of Composition and Cause of Rubbing Surface “Ink Frost”
    The Journal of Light Scattering. 2018, 30(2): 163-167. https://doi.org/10.13883/j.issn1004-5929.201802012
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    The microscope, Raman spectrometer, and scanning electron microscope were used to test the microtopography and composition of  "ink frost" without damaging the cultural relic. The results show that rubbing mildew and alum crystallization lead to rubbing "ink frost". This study provides theoretical basis for the scientific and rational protection, restoration and preservation of rubbings.
  • Examination the Front Bumpers Based on Raman Spectroscopy and Hierarchical Clustering
    The Journal of Light Scattering. 2018, 30(2): 168-173. https://doi.org/10.13883/j.issn1004-5929.201802013
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    Study on the species identification of 44 different brands front bumper with Raman spectroscopy and hierarchical clustering. Using micro laser raman spectroscopy techniqology detects samples respectively, and showed that in the Raman spectrum first derivative of 532 nm laser propagation, the front bumper spectral morphology could construct a model of clustering with the high discrimination. Gathered the spectral data and quantified it. The characteristic data were clustered by selecting the Between-Groups Linkage as the distance between classes and using Squared Euclidean as the closeness between interval representations of samples. 44 kinds of front bumper were successfully divided into the following 19 categories by measuring the clustering effects and the cross validation of the classification accuracy was 94.8%, the result was ideal. The model based on the full band spectral information and the Hierarchical cluster could be used to accurately identify the types of front bumper, which provided a theoretical basis for examining the physical evidence.
  • Simulation of Scattering Characteristics of Typical Nonspherical Particles for Cloud Particle Detection System with Polarization Detection
    The Journal of Light Scattering. 2018, 30(2): 174-181. https://doi.org/10.13883/j.issn1004-5929.201802014
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    In order to detect characteristics of ice cloud and mixed phase cloud and further understand the process of cloud physics, a cloud particle detector with polarization channel which can simultaneously detect the depolarization ratio of backscattering and the scattering energies of forward scattering is presented in a fixed solid angle. The phase function, depolarization ratio of different angles, total scattering cross section of the ellipsoid, cylindrical and spherical particles has been simulated. We found that spherical particles have almost no depolarization, and the depolarization ratios of ellipsoid, cylindrical particles are several magnitude larger, so the spherical particles can be distinguished from nonspherical particles by depolarization ratios. The mean depolarization ratio and particle scattering cross section of nonspherical particle at the two receiving solid angles has been caculated, depolarization ratio and particle scattering cross section varies with aspect ratio smoothly, which makes the distinguishment between particles with different aspect ratio more directly. Particle depolarization ratio changes with the equivalent radius of the particle fluctuately, which goes against the detection. The equivalent particle radii and the scattering cross section are generally in positive correlation, so the particle size can be detected by their scattering cross sections. The simulation results shows that the detection system has the ability to detect nonspherical particles in addition to the ability for spherical particles detection.
  • Inter-atomic Thermal Vibration Correlation Effect of Y2O3
    The Journal of Light Scattering. 2018, 30(2): 182-188. https://doi.org/10.13883/j.issn1004-5929.201802015
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    X-ray diffraction experiment has been performed on powder Y2O3 at room temperature. The apparent diffuse scattering intensity of the vibration shape is observed. Based on the general equation of the background intensity of full diffraction, the thermal diffuse scattering intensity equation of Y2O3 is developed. According to the comparison between the experimental value and the theoretical value, the value of the inter-atomic thermal vibration correlation effects μ was obtained. It is observed that the thermal diffuse scattering intensity of Y2O3 mainly comes from the independent vibration of atoms; the shape of thermal diffuse scattering is mainly determined by the thermal vibration correlation effect between Sixth neighboring atoms. The force constants among neighboring atoms in Y2O3 are obtained from the values of inter-atomic thermal vibration correlation effects.
  • Inspection of Electrical Tapes by Optical Coherence Tomography
    The Journal of Light Scattering. 2018, 30(2): 189-196. https://doi.org/10.13883/j.issn1004-5929.201802016
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    Electrical tape is a common material evidence at the crime scene. the inspection and identification of electrical tape can not only provide direction for investigation, but also provide evidence for criminal proceedings. OCT is an optical imaging inspection technique that appeared in 1990s. which has the characteristics of nondestructive, high-resolution, tomography and so on. 12 different brands and different colors of electrical tapes were tested by OCT, and the 2D OCT image and optical characteristic parameters were obtained. The result shows that OCT can effectively distinguish different electrical tapes. OCT provides a new method for the inspection of electrical tapes. Compared with the traditional inspection methods, OCT does not need to pre-treat the samples, is easy to operate, imaging fast, and improves the efficiency of inspection.
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