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表面增强拉曼散射(Surface enhanced Raman scattering,SERS)是一种灵敏度很高的生物检测技术。近年来有研究表明,在半导体纳米材料表面用贵金属修饰所得的结构具有很强的SERS效应。本文提出了一种基于负载金纳米颗粒的宽禁带半导体FiO_2纳米线的SERS基底。FiO_2纳米线的制备采用成本低廉、工艺简单的水热合成法,然后采用原位化学还原生长法负载Au纳米颗粒,最后引入罗丹明6G(R6G)作为探针分子,证明该SERS基底能有效增强拉曼信号,实现最低浓度为10~(12)。mol/L的R6G的检测,适合应用于包括生物分子、有机污染等在内的有机分子的痕迹检测。
Surface enhanced Raman scattering (SERS) is a highly sensitive biological detection technology. In recent years, studies have shown that the structure of semiconducting nanomaterials modified with precious metals has a strong SERS effect. In this paper, we propose a SERS substrate based on a wide band gap semiconductor FiO2 nanowire loaded with gold nanoparticles. FiO_2 nanowires were prepared by hydrothermal method with low cost and simple process. Then the Au nanoparticles were loaded by in-situ chemical reduction and growth method. Finally, rhodamine 6G (R6G) was used as a probe molecule to prove that the SERS substrate was effectively enhanced Raman signal to achieve the minimum concentration of 10 ~ (12). mol / L R6G detection, suitable for the detection of organic molecules including biomolecules, organic pollution and other traces.