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铝钛菁的表面增强拉曼散射研究
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Abstract:
表面拉曼增强(Surface-Enhanced Raman Scattering, SERS)是一种通过在金属表面产生的局部电磁场增强拉曼散射信号的技术。这种增强效应可用于提高分子的检测灵敏度，对于表面吸附的分子进行检测和分析具有重要意义。在光学工程中，铝钛菁常被用于SERS的研究，主要因为它具有适当的分子结构和光学性质，能够与金属表面相互作用，从而增强拉曼信号。常用的金属基底包括银、金、铜等。这些金属表面对铝钛菁的吸附和相互作用能够引起局部电磁场的增强效应。在本研究中，我们用二种不同形状的金纳米结构金纳米球、金纳米立方体(AuNs、AuCube)以研究其在SERS信号中的表现。结果表明，越复杂的结构会导致SERS增强越强，我们用二种不同形状的金纳米结构(AuNs、AuCube)以研究其在SERS信号中的表现。我们经过有限时域差分模拟(FDTD)对这些纳米结构进行模拟，模拟结果与实验结果一致。SERS技术结合铝钛菁可以显著提高分子的检测灵敏度。这对于追踪和检测低浓度的生物分子、药物、化学物质等具有重要价值，尤其在医学诊断和环境监测领域。
Surface-Enhanced Raman Scattering (SERS) is a technique that enhances Raman scattering signals through local electromagnetic fields generated on metal surfaces. This enhancement effect can be used to improve the detection sensitivity of molecules, which is of great significance for the detection and analysis of surface-adsorbed molecules. In optical engineering, aluminum-titanium cyanine is often used in the study of SERS, mainly because it has the appropriate molecular structure and optical properties, and is able to interact with metal surfaces to enhance the Raman signal. Commonly used metal substrates include silver, gold, copper, etc. The adsorption and interaction of these metal surfaces on aluminum-titanium cyanine can cause the enhancement effect of local electromagnetic fields. In this study, we used two different shapes of gold nanostructured gold nanospheres and gold nanocubes (AuNs, AuCube) to study their performance in SERS signals. The results showed that the more complex the structure, the stronger the SERS enhancement, and we used two different shapes of gold nanostructures (AuNs and AuCube) to study their performance in SERS signals. These nanostructures were simulated by finite time-domain differential simulation (FDTD), and the simulation results were consistent with the experimental results. SERS technology combined with aluminum-titanium cyanine can significantly improve the detection sensitivity of molecules. This is of great value for tracking and detecting low concentrations of biomolecules, drugs, chemicals, etc., especially in the fields of medical diagnostics and environmental monitoring.
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