利用静电纺丝技术制备了一种聚丙烯腈/银纳米粒子复合纳米纤维的表面增强拉曼光谱基底.通过调节聚丙烯腈溶液的浓度可得到不同直径、不同厚度的纤维薄膜,将聚丙烯腈的N,N-二甲基甲酰胺溶液与硝酸银溶液混合得到聚丙烯腈/Ag种子溶液,然后利用静电纺丝技术制备聚丙烯腈/Ag种子/AgNO3复合纳米纤维;加入AgNO3并利用水合肼二次还原后可制备适合拉曼检测的聚丙烯腈/Ag纳米粒子复合纤维膜,聚合物纤维表面和内部的金属纳米粒子的密度可调节.通过调节不同的纳米粒子的密集程度,可构筑出具有较高的电磁场增强效果的特殊的“热”结构(高局域强电磁场的亚波长区域).而聚合物纤维内部的银纳米粒子可通过溶胀作用吸附更多的探针分子,提高拉曼检测的灵敏度.该基底有很好的SERS信号,并且可大规模制备。

In this paper,we have prepared polyacrylonitrile(PAN)/Ag nanoparticle composite nanofibers as a surface enhanced Raman scattering(SERS) substrate via an elelctrospinning technique.First,the PAN and AgNO3 were dissolved in N,N’-dimethylformamide solvent to get PAN/Ag seed solution;then the PAN/Ag seed solution was electrospun for the preparation of PAN/Ag seed composite nanofibers;Finally,the PAN/Ag seed composite nanofibers were treated by hydrazine hydrate to synthesize PAN/Ag nanoparticle composite nanofibers.The as-prepared PAN/Ag nanoparticle composite nanofibers were mixed with the probes for the SERS detection to get the SERS spectrum of the probes.The PAN/Ag nanoparticle composite nanofibers substate showed a good SERS signal when the concentration of PATP is as low as 10－6 mol·L-1.Furthermore,this kind of SERS substrate could be large-scale prepared,which showed a high commercial value.