25 October 2023, Volume 35 Issue 3
    

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  • Principle of Tip-Enhanced Raman Spectroscopy and Advances in Scientific Research and Teaching Education
    Yi Cao, Hulin Zhao, Mengtao Sun,
    Chinese Journal of Light Scattering. 2023, 35(3): 189-205. https://doi.org/10.13883/j.issn1004-5929.202303001
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Tip-Enhanced Raman Spectroscopy (TERS) technology is a susceptible characterization technique with high spatial resolution. As a non-contact, non-destructive testing system, TERS has gradually become a research hotspot in many disciplines. This paper introduces the principle of TERS technology and the characteristics of metal needle tips, summarizes the research progress of TERS technology in material and life sciences, analyzes the application of TERS technology in teaching, scientific research, and cross-discipline, and discusses the application of TERS technology in chemistry. , physics, biomedicine, and the application of subject teaching and research integration. These research progresses provide essential references for applying TERS technology in material science research, education, and scientific research and help promote further development and application.
  • Advances in application of metal graphitic nanocapsules in SERS
    YIN Zhiwei, WEN Yijing, SHI Rui, XIA Xin, WANG Shen, CAO Xiaoxu, CHENG Yuqi, ZENG Jiayu, LI Shengkai, CHEN Zhuo
    Chinese Journal of Light Scattering. 2023, 35(3): 206-216. https://doi.org/10.13883/j.issn1004-5929.202303002
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Surface-enhanced Raman Scattering (SERS) has been widely used in the field of surface / interface science, spectroscopy, biochemical detection, trace imaging. The metal graphitic nanocapsules were a kind of core-shell nanoparticles whose graphitic shell isolated metal core. It has attracted research attention in the field of biochemical detection analysis and trace imaging due to their high SERS sensitivity, excellent stability and optical properties in complex and harsh biochemical environments. The inherent chemical inertness of the ultrathin graphitic shell could protect the metal core from external factors such as photogenerated hot electrons, reactive oxygen species, and enzymes, which exhibited ultra-stable Raman signal output. Moreover, the multiple characteristic Raman bands (D, G, 2D) of the graphitic shell could be used as Raman signals and internal standard signals to further improve the accuracy of Raman quantitative detection. Notably, the 2D peak as a signal band in the Raman silent region was beneficial to reduce the interference of biomolecules in vivo. This review first introduced the preparation and properties of metal graphitic nanocapsules, and then summarized the application of metal graphitic nanocapsules in detection and imaging based on the SERS. Finally, the prospects and potential of metal graphitic nanocapsules in theranostic were prospected. Keywords: Surface Enhanced Raman Scattering; Metal graphitic nanocapsules; SRES analysis and imaging；Ultra-stability
  • Anapole States in Light Scattering: Theory, Structures, and Applications
    TIAN Shuo, WANG Junqiao., GAO Ya, LIANG Erjun, DING Pei
    Chinese Journal of Light Scattering. 2023, 35(3): 217-231. https://doi.org/10.13883/j.issn1004-5929.202303003
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    The anapole state in scattering is a unique optical phenomenon in the field of nanophotonics, which can be analyzed by Mie theory and multipole expansion. For the most common first-order electric anapole, it can be explained by the destructive interference of Cartesian electric dipole and toroidal dipole, with typical far-field scattering suppression and near-field enhancement. In this paper, we describe the basic concept and theory of anapole state firstly, and then summarize the micro-nano structures which support anapole states. Finally in combination with the unique optical properties of anapole states, the potential photonics applications and recent research progress of anapole states in fields such as near-field enhancements, nonlinear optics and lasers are discussed and prospected.
  • Time Evolution of High-Energy Electron Radiation in Intense Laser Pulses
    SUN Shichen, TIAN Youwei, XUE Hongtao
    Chinese Journal of Light Scattering. 2023, 35(3): 232-237. https://doi.org/10.13883/j.issn1004-5929.202303004
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    In order to study the time evolution of the high-energy electron radiation in the circularly polarized intense laser pulse, a model of the interaction between the high-energy single electron and the intense laser pulse is constructed on the basis of the Lagrangian equation and the electron energy equation. Simulations and calculations are carried out through MATLAB to obtain simulated images of the time evolution of the spatial distribution of electron radiation. The results show that the electromagnetic radiation energy presents a vortex-like spatial distribution with time, and concentrates in the center after about 1000fs; the speed of the radiation concentrating inward gradually slows down over time. In addition, the maximum value of the radiant energy per unit solid angle will also increase with time, and the rate it changes first increases and then decreases. Around 450fs, the radiation energy levels off, then continues to climb slowly until it stabilizes at 1.18×10-12J/cm2 after 1000fs. Thus, ideal electron radiation can be obtained more easily by controlling the interaction time between electrons and laser light.
  • Preparation of Thermotolerant SERS Substrate by Electrospinning
    Li Duoduo＃, Shao Fei＃, Hu Sen, Guo Xiaoyu, Wen Ying, Yang Haifeng
    Chinese Journal of Light Scattering. 2023, 35(3): 238-244. https://doi.org/10.13883/j.issn1004-5929.202303005
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, Au@AgNPs core-shell nanoparticles are synthesized by using nano-Au seeds template method and then loaded on the poly (styrene butadiene) (SB) fiber membrane made-by electrospinning to prepare Au@AgNPs /SB as the surface enhanced Raman scattering (SERS) flexible substrate. Ultraviolet-visible spectroscopy (UV-vis), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Raman spectroscopy are used to characterize the morphology and spectral properties of such substrate. Using Rhodamine 6G as a Raman molecular probe, on Au@AgNPs, SERS spectra are recorded after temperature-rise process, showing good thermal tolerance of Au@AgNPs /SB substrate. Therefore, Au@AgNPs /SB substrate could be utilized to detect the target samples pretreated samples at relatively high temperatures, and is conducive to improving the detection sensitivity. Taking the SERS detection of thiram as proof of concept, the limit of detection can be as low as 3.65×10-9 mol/L by using Au@AgNPs /SB extraction of thiram in a hot solution.
  • Preparation and Enhanced Raman Spectroscopic Characteristics of Surface Hydrophobic Paper Substrates
    Cao Yi, Liu Wen, Fan Chongyu, Fang Ziqing, Dong Jun
    Chinese Journal of Light Scattering. 2023, 35(3): 245-253. https://doi.org/10.13883/j.issn1004-5929.202303006
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    This article describes a hydrophobic paper based substrate modified with gold and silver alloy nanoparticles, which has a high-density distribution of nanoparticles in the deposition range and high detection sensitivity. It has certain research significance in the field of trace detection. Firstly, different proportions of gold and silver alloy nanoparticles were assembled onto a hydrophobic treated filter paper to improve the plasmonic properties of the substrate. At the same time, high-density nanoparticles were deposited onto a hydrophobic paper substrate through cyclic stacking of the deposition process. In the field of trace detection, the detection limit of trace Rhodamine 6G and crystal violet probe molecular solutions can reach 10-10 M and 10-8 M respectively, and this substrate can be used in the field of pesticide molecular detection, and its detection limit for thiram can reach 10-7 M.
  • Study on the Performance of High Sensitivity Fiber SERS Substrate
    Duwei, Weishennan, Li yue, Wangmingli
    Chinese Journal of Light Scattering. 2023, 35(3): 254-262. https://doi.org/10.13883/j.issn1004-5929.202303007
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    Due to the controllable length of the fiber and its unique optical performance, the detection of the fiber SERS substrate is flexible and simple. In this study, silver nanoparticles were modified on the fiber end face using an oil-water separation experimental method, proving that this method can prepare the fiber SERS substrate and effectively enhance Raman signals. We used Crystal violet solution as the analyte to characterize the SERS fiber matrix, and studied the uniformity, sensitivity and stability of the fiber SERS substrate. In practical application, optical fiber substrate was used to detect 4-aminonenenebb thiophenol, which is widely used in the synthesis of Rhodamine 6G and pesticide intermediates. These experimental results demonstrate that the self-assembly method provides a feasible approach for the preparation of fiber SERS substrates.
  • Preparation of UiO-66/AuNPs SERS substrates and detection of organic dyes
    Xie Yuting, Wei Qingyi, Pu Hongbin
    Chinese Journal of Light Scattering. 2023, 35(3): 263-269. https://doi.org/10.13883/j.issn1004-5929.202303008
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    Combing the metal organic frameworks (MOFs) with surface enhanced Raman scattering (SERS) hybrid substrates have been to a focus of high-efficiency SERS detection. In this study, we developed a MOF-SERS substrate by immobilizing the thioctic acid-modified gold nanoparticles (AuNPs) onto the surface of UiO-66 through electrostatic interactions. The effect factor (EF) of UiO-66/AuNPs substrates for the cationic malachite green, methylene blue and saffron T were 2.12×104, 4.46×104 and 7.20×104, two orders of magnitude higher than the EF of 1.43×102, 2.54×102 and 1.73×102 for the anionic lemon yellow, sunset yellow and congo red. Overall, UiO-66/AuNPs substrates can selectively improve the detection sensitivity of cationic pigments by electrostatic adsorption and are a highly efficient SERS sensor material with promising applications.
  • Studying on the mechanism of modified Rhodamine -6G by surface-enhanceed Raman spectroscopy(SERS) under light conditions
    WANG Dingding, AN Xiaojiao, XU mengtian, LIU Tao, WANG Jun,
    Chinese Journal of Light Scattering. 2023, 35(3): 270-274. https://doi.org/10.13883/j.issn1004-5929.202303009
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The molecular structure of modified Rhodamine-6G is complex, and it is easy to decompose. In order to reduce the fluorescence back-bottom of Raman spectrum and improve the stability of signal, the influence of laser wavelength , intensifier proportion, stabilization time, spectral acquisition and other parameters were optimized and analyzed in this paper, and the optimal test conditions were determined: laser wavelength(785nm), intensifier proportion (V sample:V intensifier=2:1), stabilization time of enhancer and sample after mixing(0.5h), spectrum conditions(collection spectrum time 10s, integration times3 ). Under these conditions, the concentration standard solution(100-250mg/L) was tested with three parallel samples. The response value and concentration curve were established with the F1 peak area as the response value, and the concentration linear equation was obtained. The linear correlation coefficient of this method was 0.968, the standard deviation was 3.85%, and the detection limit was 25mg/L, which indicated that this method could be used for the determination of rhodamine-6G concentration. Under light dyes, its concentration and characteristic peak change was determined, the results show that with the increase of time, the dye concentration drops rapidly, as the same time HF1:F2 peak height ratio decreased, F1 relater to C-F bond, and F2 relater to xanthene bond, during the decomposition process, xanthene bond main chain and C-F bond side chain rupture and the C-F bond is more likely to break.
  • Fourier transform infrared spectroscopy analysis of ginger medicinal herbs stored for 5 years
    LIU Yan, YIN Dedu, SI Mingzhen
    Chinese Journal of Light Scattering. 2023, 35(3): 275-285. https://doi.org/10.13883/j.issn1004-5929.202303010
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    Fourier transform infrared spectroscopy combined with curve fitting technology was used to study the ginger medicinal materials stored for 5 years, in order to explore the composition changes of ginger medicinal materials stored for 5 years. The results showed that the original infrared spectra were similar, and the main substances reflected in the spectra were volatile oils, flavonoids, sugars, amino acids, etc. Local amplification and second derivative processing of original spectra of 1300 ~ 1450 cm-1 with large differences in spectra showed that 1384cm-1 and 1410cm-1 had significant differences in peak strength and peak position, and it was inferred that the content and internal structure of compounds containing isopropyl and tert-butyl had changed. Combined with absorbance ratio method and curve fitting area quantitative analysis, the content of volatile oil of 22 species of ginger showed a decreasing trend and the content of carbohydrate showed an increasing trend with the change of storage time. The results showed that Fourier transform infrared spectroscopy combined with curve fitting could provide an effective method for quality analysis of ginger.
  • Study on the Fractal Structure of Aluminum Hydroxide Colloid by synchrotron radiation SAXS Technology
    BING Liujie WANG Long
    Chinese Journal of Light Scattering. 2023, 35(3): 286-295. https://doi.org/10.13883/j.issn1004-5929.202303011
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    In this paper, the fractal structure evolution of aluminum hydroxide colloid particles under aging time 0 - 135 minute was investigated by using synchrotron radiation SAXS technology and other potential characterization methods, including FTIR, SEM, DLS, and Zeta potential.The possible growth mechanism was proposed. The scattering double logarithmic coordinate plots under different aging times showed obvious linearity, indicating that significant differences in the fractal structure of the samples. With the extension of aging time increased from 25 minute to 85 minute, the mass fractal dimension Dm increased from 2.29 to 2.78. The Dm values were in the range of 2.76 - 2.79, with little change between 95 and 135 minutes. This indicated that the primary particles of the system will rapidly reunite from the initial relative dispersion state to larger size clusters and finally form dense gels at the aging time 25 minute - 85 minute. The gel process had been completed, the size of the colloid particles did not change during 95 -135 minute, and the adhesive block may break at 135 minute.
  • Study of insulator pollution type detection method based on SAM-ED spectral matching
    Liu Yicen, Liu Xi, Yang Lin, Lin Kexin, Guo Yujun, Zhang Xueqin
    Chinese Journal of Light Scattering. 2023, 35(3): 296-302. https://doi.org/10.13883/j.issn1004-5929.202303012
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    Fouling flash is one of the important reasons that threaten the safe and stable operation of power system, and the difference of fouling type will directly affect the size of flashover voltage. Therefore, timely information on insulator fouling type plays an important role in preventing fouling. To this end, a SAM-ED spectral matching based insulator fouling type detection method is proposed. The hyperspectral data of different fouling type samples are collected, and the noise and other interference factors are removed by black and white correction and multiple scattering correction (MSC); the spectral data are selected by competitive adaptive reweighted sampling (CARS), and the samples are matched with the reference spectra by SAM-ED spectral matching method in the characteristic band and full band range, respectively, and the samples are classified according to the matching results. The experimental results show that the SAM-ED spectral matching method is more effective than the spectral angle matching method and the minimum distance method, and the accuracy of SAM-ED spectral matching based on the full wavelength data can reach 95%, and the accuracy of SAM-ED spectral matching based on the characteristic wavelength data can reach 98.33%.
  • Scientific analysis and evaluation of iron wares’ conservation materials by FTIR and Py-GC/MS
    WANG Keqing, , YANG Qin, , ZHANG Ran, , LIU Wei,
    Chinese Journal of Light Scattering. 2023, 35(3): 303-310. https://doi.org/10.13883/j.issn1004-5929.202303013
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    At the beginning of 1970s, conservators at National Museum of China started research on the protection and restoration of ironware. According to the degree of rust, the cultural relics protection and restoration personnel carried out cleaning, rust removal, desalination, bonding and sealing treatments. When examining and reviewing the four iron wares that were protected and restored at that time for fully understanding the previous restorations done on these iron wares, the work uses Fourier Transform Infrared Spectroscopy (FTIR) and Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) to analyze the restoration materials used in the collection of ironware. Py-GC/MS does not require sample pretreatment when analyzing samples, and the samples can be directly analyzed by thermal cracking, and the operation is relatively simple. In addition, this method requires a small amount of sample. It can not only provide a scientific evaluation the repair materials in iron wares, but also provide important guidance for evaluating the protection and restoration methods used in the past and the long-term preservation of iron wares.
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