通过模板法制备了强表面增强拉曼散射(SERS)活性的“球加片”Au/Ag纳米结构阵列,并利用这种纳米衬底对PCB-77分子的SERS光 谱进行了研究。结果表明,尽管该纳米结构能够检测到PCB-77分子的SERS特征峰,但信噪比低。 利用癸烷硫醇中的巯基与贵金属之间相互作用,实现了癸烷硫醇分子对纳米结构表面的功能化修饰, 研究发现此时PCB-77分子的SERS光谱质量得到了明显改善。并且,这种“球加片”衬底的癸烷硫醇分子 最优修饰时间为36 h,利用经36 h修饰后的纳米衬底,极大地提高了PCB-77的SERS光谱特征峰的强度。

A “sphere plus plate”-composed Au/Ag nanostructure arrays with strong surface-enhanced Raman scattering (SERS) activity are fabricated through the templated method, and the SERS spectrum of polychlorinated biphenyl-77(PCB-77) based on this nanostructure is investigated. The results indicate that the characteristic Raman-shift peaks of PCB-77 may be observed with the bare SERS substrate, but the signal-to-noise ratio of SERS spectrum is too low. By functionalization-modifying decanethiol (DT) on the surface of the bare SERS substrate with the help of the interaction between the -SH group of DT and novel metals, the SERS spectrum of PCB-77 is obviously improved. With the optimal functionalization-modified SERS substrate which is soaked in the DT solution for 36 h, the characteristic Raman-shift peaks’ intensity of the SERS spectrum of PCB-77 gets enhanced greatly.