Surface enhanced Raman spectroscopy is a vibrational spectroscopy technique that enhances molecular Raman signals through noble metal nanostructures, commonly used in biological or chemical analysis in the fields of food, environment, and medicine. The controllable, repeatable preparation of nano periodic structures with high-density hotspots is currently the research highlights. This article introduces the method of using ion beam evaporation deposition and ultra-thin dual pass anodized aluminum oxide (AAO) template to prepare low-cost, large-area periodic nanodots array SERS substrates, and simulates the absorption rates of gold nanodots array with different diameters. The surface enhanced Raman spectroscopy characteristics of the SERS substrates were tested and analyzed using Rhodamine 6G as the probe molecule. The results showed that the SERS substrate of gold nanodots with a diameter of 260nm and a thickness of 35nm prepared on Si substrate can detect 10-7mol/L of Rhodamine 6G. The enhancement effect of the periodic structure of the gold nanodots at 1361.555 cm-1 is 22 times that of ordinary gold films of the same thickness.
Surface Enhanced Raman Scattering (SERS) is typically observed with the substrate in a liquid medium and it has been proposed as a promising technique for detecting low levels of pollutants in liquids. The design and fabrication of an optical fibre SERS sensor based on Au nanoparticles (Au-NPs), which is self-assembly immobilized onto the end surface of an optical fibre is described. Two toxic materials, Rhodamine 6G (R6G) and crystal violet were analysed using this optical fibre SERS sensor combined with portable Raman spectrometer. Our proposed fabrication and analytical method offers a rapid, cheap and disposable trace detection capability for toxic materials in the field.
In recent years, distributed optical fiber temperature measurement system has been widely used in industrial safety field. In this paper, the principle of distributed optical fiber temperature measurement system is introduced and the system performance is tested. The design and development of self-calibration system without real-time temperature compensation is carried out. The measurement accuracy of the system is improved. The distributed optical fiber temperature measurement system with low power consumption and high performance has been applied in the goaf and cable temperature field of coal mine, which provides a favorable detection method for the safety detection of coal mine underground.
Surface enhanced Raman spectroscopy (SERS) is a fast, convenient and highly sensitive detection technique, and preparing the good effect and repeatable substrate is the key to realize the trace amount and quantitative detection in the field of food safety detection. In this paper, a surface enhanced Raman substrate based on submicrometer silver particles structure was prepared by chemical deposition method, and characterized its structure and optical properties.
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