癸烷硫醇修饰的金/银SERS衬底用于PCB-77检测的研究

Decanethiol-modified Au/Ag SERS substrates for detection of polychlorinated biphenyl-77

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.