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.

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.

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.

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 1000 fs; 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 450 fs, the radiation energy levels off, then continues to climb slowly until it stabilizes at 1.18×10-12J/cm2 after 1000 fs. Thus, ideal electron radiation can be obtained more easily by controlling the interaction time between electrons and laser light.

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.

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.

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.

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.

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(785 nm), intensifier proportion (V sample∶V intensifier=2∶1), stabilization time of enhancer and sample after mixing(0.5 h), spectrum conditions(collection spectrum time 10s, integration times3 ). Under these conditions, the concentration standard solution(100-250 mg/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 25 mg/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 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.刘艳(1999, 9), 女, 硕士, 助教, 主要从事分子光谱学研究

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.邴柳洁(1996-), 女, 硕士研究生学历, 就职于北京石油化工工程有限公司, 主要从事传热计算等工艺设计工作, 辅修同步辐射SAXS技术在胶体、分子筛等材料中的应用

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%.刘益岑(1986-), 男, 硕士, 高级工程师, 研究方向为电网防灾减灾及在线监测等

At the beginning of 1970s, conservators started research on the protection and restoration of ironware. According to the degree of rust, the conservators carried out cleaning, rust removal, desalination, bonding and sealing treatments. When examining and reviewing the four restored 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.