Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China.
Shanghai Institute of Satellite Engineering, China Aerospace Science and Technology Corporation, Shanghai 201109, China.
Molecules. 2021 Oct 28;26(21):6522. doi: 10.3390/molecules26216522.
Surface-enhanced Raman scattering (SERS) has been widely reported to improve the sensitivity of Raman spectra. Ordinarily, the laser is focused on the sample to measure the Raman spectrum. The size of the focused light spot is comparable with that of micro-nano structures, and the number of micro-nano structures contained in the light spot area (defined as duty cycle) will severely affect the spectrum intensity. In this study, flower-like silver nanostructures were fabricated with a soft lyotropic liquid crystal template in order to investigate the effect of duty cycle. They were observed under a scanning electron microscope, and their spectrum enhancement factor was computed with the obtained Raman spectrum. Then, their duty cycles were measured using a SERS substrate at different locations. A formula was derived to represent the relation between the duty cycle of the nanoflowers and the Raman spectral intensity. This work could promote the actual applications of SERS in high-sensitivity spectrum testing.
表面增强拉曼散射（SERS）已被广泛报道可提高拉曼光谱的灵敏度。通常，激光聚焦在样品上以测量拉曼光谱。聚焦光斑的大小与微纳结构的大小相当，光斑区域内包含的微纳结构数量（定义为占空比）将严重影响光谱强度。在这项研究中，使用软溶致液晶模板制备了花状银纳米结构，以研究占空比的影响。通过扫描电子显微镜观察到它们，并通过获得的拉曼光谱计算了它们的光谱增强因子。然后，使用 SERS 基底在不同位置测量它们的占空比。推导出一个公式来表示纳米花的占空比与拉曼光谱强度之间的关系。这项工作可以促进 SERS 在高灵敏度光谱测试中的实际应用。
