10 March 2021, Volume 33 Issue 1
    

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    Overview
  • Recent Advances of Raman Spectroscopy in Structural Characterization of Two-dimensional Materials
    DONG Wenlong, LIU Luqi
    Chinese Journal of Light Scattering. 2021, 33(1): 1-15. https://doi.org/10.13883/j.issn1004-5929.202101001
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Two-dimensional (2D) materials, with remarkably electronic, optical, and thermal properties, have attracted tremendous attention in recent years. To meet the rapid development of 2D materials, it's fundamentally necessary to the precisely characterize the structure and properties of 2D materials. Raman spectroscopy has been proven to be a fast, convenient, and nondestructive technique to characterize the basic structural information of low dimensional materials. In this review, we introduce recent advances in Raman spectroscopy for structural characterization of 2D materials. We mainly focus on the characterization of layer number, stacking order, crystalline orientation, defects, and structural phase transition of 2D materials by Raman spectroscopy.
    • Surface-Enhanced Raman Scattering (SERS)
  • Dithizone Modified Silver Nanomaterials for Recyclable Surface-enhanced Raman Spectroscopy Detection of Lead Ions
    GUO Yanyan, TIAN Huaixiang, LI Yuanting, LI Dan
    Chinese Journal of Light Scattering. 2021, 33(1): 16-23. https://doi.org/10.13883/j.issn1004-5929.202101002
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    The study took heavy metal lead ions (Pb2+) as the research object, constructed dithizone-modified silver nanoparticles, and successfully realized the cyclic surface-enhanced Raman detection of lead ions by using redox method and surface enhanced Raman technology. The detection response range of functional materials to lead ions is 1nM~10μM, and the detection limit can reach 0.35nM. Using the method to detect lead ions in actual environmental water samples, the recovery rate is 91.6%~106.8%, and the relative standard deviation is between 4.1% and 7.9%. The method has the characteristics of convenience, rapidity and reusability, and has a huge application prospect in the rapid detection of heavy metal ions in environmental samples.
  • Comparative Study of SERS Performance of Assembled Au Nanorods and Au Nanodumbbells Based on Capillaries
    WANG XiaoAn, SHEN Wei, YU Daoyang, DONG ronglu, TANG Xianghu
    Chinese Journal of Light Scattering. 2021, 33(1): 24-31. https://doi.org/10.13883/j.issn1004-5929.202101003
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    In this article, the comparative study of surface-enhanced Raman scattering (SERS) performance of assembled Au nanorods (AuNRs) and Au nanodumbbells (AuNDs) based on capillaries was introduced. Under the same conditions of the synthetic precursor and the dispersed system, two kinds of nano units were assembled on the inner wall of capillaries based on the same surface ligand exchange treatment process and the same assembly technology. And the AuNDs assembly structures based on capillary (AuNDs/cap) showed more significant SERS activity. Meanwhile, the uniform and reproducibility of the two assembly structures were pretty much the same. Furthermore, the AuNDs/cap structures can be used for sampling and SERS detection of malachite green (MG) down to 2×10-3μg/g levels in real water samples, which exhibit an excellent practicability and a great promise for rapid and credible practical detection.
  • Assembly of Indium Tin Oxide Nanoarrays for Synergistically Enhanced Raman Scattering
    SI Lifang, FAN Xingce, HOU Xiangyu, LI Guoqun, LONG Kailin, LUO Xiaoguang, NI Zhenhua, QIU Teng
    Chinese Journal of Light Scattering. 2021, 33(1): 32-39. https://doi.org/10.13883/j.issn1004-5929.202101004
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Some metal oxides possessing surface-enhanced Raman scattering (SERS) ability have drawn tremendous attention recently for their good signal uniformity, chemical stability and biocompatibility. However, most of them present deficient Raman enhancement factors which cannot meet the rigorous requirement in SERS applications. It is desirable to develop efficient approaches to promote the SERS performance. The different inherent features of metal oxides compared with noble metals, endow the former abundant possibilities to tailor SERS performance, such as tailoring of bandgap, stoichiometry or excitons. The effective tailoring of several inherent properties of metal oxides simultaneously may contribute synergistically to the overall SERS performance. Therefore, we choose indium tin oxide (ITO) as an example to explore the possibility to integrate its inherent SERS-activity with its optical interference cavity, to further promote the SERS performance. This work demonstrates a synergistical approach to engineer the SERS-active metal oxide substrate, providing a general concept to manage the intrinsic SERS ability of metal oxide together with optical interference effect.
  • High-pressure Raman spectroscopy of Ga2O3
    ZHANG Feng, TAO Yu, TANG Qiqi, WU Binbin, LIU Shan, LEI Li
    Chinese Journal of Light Scattering. 2021, 33(1): 40-44. https://doi.org/10.13883/j.issn1004-5929.202101005
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    As a wide-band gap (Eg=4.8 eV) semiconductor, the phase stability and lattice dynamics about the Ga2O3 under high pressure provide us the valuable information for its applications. However, the lack of the study on the phase stability and the lattice dynamics of Ga2O3 under high pressure makes the phase transition point remains controversial. In this work, we find that the irreversible β→α phase transition occurs at 20.1-22.7 GPa by using the high-pressure Raman scattering based on diamond anvil cell (DAC). We also provide the Grüneisen parameter and pressure coefficient of α-Ga2O3 and β-Ga2O3. Our results also suggest that the pressure coefficient of β-Ga2O3 exhibits anharmonic properties.
    • Other Optical Spectroscopic Techniques and Applications
  • Influence of Oxygen Pressure on The Optical and Electrical Properties of GZO Thin Films
    MA Yalei, XU Lei, ZHANG Yuanyue, HAN Chong, CAO Peijiang, PAN Yuewu
    Chinese Journal of Light Scattering. 2021, 33(1): 45-51. https://doi.org/10.13883/j.issn1004-5929.202101006
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    In this paper, the pulsed laser deposition (PLD) method was used to prepare Ga-doped ZnO (GZO) nano-films on single-crystal silicon (111) and quartz glass substrates, and the effect of oxygen pressure on the quality of the films was studied. The crystal structure and surface morphology of the films were characterized by X-ray diffractometer and scanning electron microscope. The results show that the average particle size of the nano-film can be controlled by adjusting the oxygen pressure. When the oxygen pressure is 0.01 Pa, the crystal quality of the films is the best. The PL spectrum analysis results show that a proper amount of oxygen in the reaction atmosphere can effectively reduce the defect density and realize the regulation of the luminescence properties of the GZO film. The transmission spectrum analysis results show that the average optical transmittance of the GZO films at 400~800 nm exceeds 85%, then it has good light transmission performance.Hall test results show that when the oxygen pressure is 0.01 Pa, the resistivity of the GZO film is the lowest 2.77×10-4 Ω·cm. With the oxygen pressure continuing to increase, the resistivity of the film was increases, and the carrier concentration and Hall mobility were fell.
    • Application in Chemistry and Biology Researches
  • In situ research on three Michelia figo Volatile Organic Compounds with Raman
    SI Minzhen, LI Jiawang, YANG Yongan, LI Lun, ZHANG Chuanyun, ZHANG De-qing
    Chinese Journal of Light Scattering. 2021, 33(1): 52-58. https://doi.org/10.13883/j.issn1004-5929.202101007
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    In order to identify the volatile organic compounds in oil cells at room temperature, this article used a novel and original approach to analyze in situ the main components of the volatile organic compounds in three Alpinia figo oil cells by means of Raman spectroscopy. The main volatiles in the oil cells of Michelia alba DC flower were Linalool, β-Pinene, α- Bisabolol, α- Bisabolol, Carvone, α-terpinene and β-elemene. The main volatiles in the oil cells of Michelia maudiae Dunn flower and flower bud were 4-Methoxycinnamic acid ethyl ester, ρ-cymene and citronellol. The main volatiles in the oil cells of Michelia xanthantha C. Y. Wu small flower bud, flower bud, and flower were respectively Carvone,α-Pinene, β-Pinene, tran-tran-Farnesol; ρ-cymene, 4-Methoxycinnamic acid ethyl ester, tran-tran-Farnesol; 4-Methoxycinnamic acid ethyl ester, tran-tran-Farnesol.
    • Theories of Light Scattering
  • The Research on Optical Absorption Properties of Au@SiO2 Core-Shell Single Crystal Octahedron Nanorod
    YI Zhaoguang, WU Qingchun, WANG Liancheng, JIN Yuanwei, XU Shenghui, LIU Jinsheng
    Chinese Journal of Light Scattering. 2021, 33(1): 59-64. https://doi.org/10.13883/j.issn1004-5929.202101008
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    The coating material changes the mechanical and optical properties of a single material. Using the Discrete Dipole Approximation (DDA) method, the influence of SiO2shell material, size and morphology on peak value, peak location and near-field distribution of optical absorption spectrum of Au@SiO2 core-shell single crystal octahedron nanorod is systematically studied. The results show that the optical absorption spectrum of Au nanorod coated with SiO2 shell also shows transverse and longitudinal absorption peak. With the increase of SiO2 shell thickness, the intensity of the Au@SiO2 core-shell single crystal octahedron nanorod's transverse and longitudinal absorption peak decreases significantly, the position of the transverse absorption peak is slightly blue shifted, however the longitudinal absorption peak location is significantly red shifted. The SiO2 shell can improve the hardness of the nanorod and change the peak value and position of optical absorption peak, which weakens the surface plasmon resonance intensity of Au core.
  • Study on the scattering characteristics of charged particles based on Mie scattering
    WANG Jinhu, CAI Jiahan, XIE Binze, WANG Yuhao, CHEN Jiang, ZHU Jie
    Chinese Journal of Light Scattering. 2021, 33(1): 65-71. https://doi.org/10.13883/j.issn1004-5929.202101009
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    Based on Mie scattering, the scattering characteristics of charged particles are studied, the relationship between scattering coefficient and surface conductivity is given, the scattering angles of charged particles and non-charged particles with different surfaces are calculated, and the results show that the charged scattering has little influence on metallic particles. However, when the surface charge makes the surface conductivity reach a certain order, the scattering characteristics of dielectric particles such as water sphere and ice hockey particles are obviously affected. Compared with the water sphere, the scattering coefficient oscillation phenomenon of the ice sphere is similar to the scattering efficiency of the metal spherical particles of the same size when the particle size parameter is larger and the amplitude is stronger, and the scattering efficiency is similar to that of the metal spherical particles of the same size when the face conductivity is very high, that is, when more electric charge is carried. With the increase of surface conductivity, the scattering coefficient changes greatly, but when the conductivity reaches a certain value, the scattering coefficient tends to be constant. Compared with the scattering of non-charged particles, the scattering coefficient of charged particles decreases, the scattering energy is redistributed in different directions, the backscattering intensity is enhanced, and the scattering intensity in other directions decreases. When the surface conductivity of ice hockey particles and water polo particles is large enough, their scattering characteristics are close to that of metal particles of the same size.
  • Analysis and Optimization of Refractive Index Sensing of Au-Ag Nanoshell
    WU Panpan, TUERSUN Paerhatijiang, ZHENG Yuxia, ABULAITI Remilai
    Chinese Journal of Light Scattering. 2021, 33(1): 72-78. https://doi.org/10.13883/j.issn1004-5929.202101010
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    Based on the stability, nontoxicity, and biocompatibility of Au nanoparticles and excellent extinction properties of Ag nanoparticles, bimetallic alloy nanoparticles have potential value for applications in biosensors. In order to find alloy nanoparticles with better sensing properties, the effects of the size of Au-Ag nanoshell on Refractive Index Sensitivity, Full Width at Half Maximum, and Figure of Merit were quantitatively studied, by adopting Mie scattering theory of sphere with a concentric spherical shell and the size correction model of the dielectric function. Thus the optimal Figure of Merit and the corresponding size were obtained.Meanwhile, this article studied the effect of Au molar fraction on the optimum Figure of Merit and size was studied. The results show that when Au molar fraction x is fixed at 0.5, the Figure of Merit of Au-Ag@SiO2 nanoshell reaches its maximum value (2.09) and the corresponding core radius and shell thickness are 22.3 nm and 8.7 nm, respectively. The Figure of Merit of Au-Ag@Vacuum nanoshell reaches its maximum value (2.20) and the corresponding core radius and shell thickness are 23.6 nm and 6.9 nm, respectively. When the Au molar fraction is less than 0.25, the Figure of Merit of Au-Ag nanoshell is better than that of Au nanoshell. With the decrease of the Au molar fraction, the Figure of Merit increases to at most 2-3 times of the Au nanoshell. This study provides theoretical guidance for the effective application of Au-Ag nanoshell in the field of biosensors.
    • Other Optical Spectroscopic Techniques and Applications
  • Enhanced absorption and manipulation of thermal radiation in silicon carbide gratings
    BAO Sen, WANG Zongti, ZHENG Gaige
    Chinese Journal of Light Scattering. 2021, 33(1): 79-83. https://doi.org/10.13883/j.issn1004-5929.202101011
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    The absorption and thermal radiation characteristics of the silicon carbide gratings within the wavelength range from 10 μm to 14 μm are studied and analyzed by the rigorous coupled wave analysis (RCWA) method. Influences of different physical parameters (period, depth, filling factor and incident angle) on the spectral properties are discussed in detail. The conclusions are as follows: Under TM-polarization, the period, grating depth, grating width and incidence have a significant effect on the absorption/emission spectral. With the increasing of the period and the grating depth, the absorption peak/emission peak will redshift and the peak will decrease. While the filling factor (f) decreases, the absorption peak appears within the Restrahlen band, and the smaller the f is, the larger the absorption peak is. When the incident angle is increased, the peak value of absorption/emission spectrum decreases. The conclusions of this study can also be extended to other polar crystal materials.
  • Infrared Spectra of Artificial Aging and Natural Aging of Soybean Seeds
    LIU Jie, LIU Gang, LI Shujie, DENG Ziang, OU Quanhong, SHI Youming
    Chinese Journal of Light Scattering. 2021, 33(1): 84-92. https://doi.org/10.13883/j.issn1004-5929.202101012
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    In this paper, soybean seeds under artificial aging and natural aging conditions were studied by infrared spectroscopy. The results showed that the original spectra of soybean seeds under the two aging conditions were similar, and there were differences in the intensity of absorption peaks. In the second derivative infrared spectra, the change trend of substances in soybean seeds under artificial aging and natural aging conditions tends to be consistent. The absorption peak intensity of two kinds of aging soybean seeds increased with the increase of aging degree around 1747 and 1693 cm-1. The intensity of absorption peaks around 1660, 1549, and 1236 cm-1 showed a weakening trend overall. In the vicinity of 1610-1550 cm-1, the absorption peak intensity shows an increasing trend. The intensity of the absorption peak near 1150-1100 cm-1 shows a weakening trend, but there is a certain increase in the aging process. The results of two-dimensional correlation infrared spectroscopy showed that the number and position of auto-peaks of unaged soybean seeds were the same, and the auto-peaks intensity changed. Under natural aging conditions, the number, intensity and location of auto-peaks of soybean seeds show obvious differences as the degree of aging deepens. As the aging degree of artificially aged soybean seeds deepens, the number and position of auto-peaks are not significantly different, and the intensity changes are more obvious. Lipid substances, amino acids and ketone/aldehyde substances all show an increasing trend during the aging process of soybean seeds, protein substances and sugar substances show a decreasing trend, alcohol substances and phenol substances change.The results of using infrared spectroscopy on soybean seeds under artificial aging and natural aging conditions show that infrared spectroscopy can quickly and conveniently study the spectral changes of two kinds of aging soybean seeds.
  • Pressure-induced Band Gap Engineering and Optical Properties of Low Dimensional Organic-inorganic Hybrid Perovskite MAPbI3 Nanocubes
    WANG Tao, ZHANG Huafang, MAO Yanli
    Chinese Journal of Light Scattering. 2021, 33(1): 93-100. https://doi.org/10.13883/j.issn1004-5929.202101013
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    Low-dimensional organic-inorganic hybrid perovskite materials have attracted extensive attention due to their exotic photoelectric performance. In this paper, different size (CH3NH3PbI3) MAPbI3 nanocubes were studied by using diamond anvil cell (DAC), under high-pressure conditions. And explored the regulation of the size effect on the the optical properties of MAPbI3 nanocubes under high pressure. The in-situ high-pressure UV-visible absorption and photoluminescence spectra showed that the band gap and optical properties of MAPbI3 nanocubes with two different sizes showed different changes. The band gap of small-sized MAPbI3 nanocubes decreases with the increase of pressure below 0.25 GPa, while for large-sized nanocubes, the band gap continues to increased with the increasing of pressure below 0.67 GPa. The in-situ high pressure Raman measurement and analysis showed that the size effect was related to the interaction between the octahedron [PbI6]4- and the organic cation CH3NH3+. The results provide a research basis for in-depth understanding the band gap regulation, optical properties and structural stability of low dimensional organic-inorganic hybrid perovskite nanocrystals, and it provides a research idea for improving the conversion efficiency of organic-inorganic hybrid perovskite cells.
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