单面纳米结构金膜的制备

Fabrication of Gold Films with Single-sided Nanostructures

提出一种基于界面扩散过程制备金膜表面纳米结构的方法.采用真空热蒸发方法依次蒸镀金和铜双层膜,经过热退火处理,再用化学腐蚀方法除去铜组分来制备单面纳米孔金膜.用扫描电子显微镜观察薄膜表面形貌,并比较了退火温度以及退火时间对纳米结构的影响.研究还发现,当这种具有纳米结构的金膜吸附有单分子层的对甲基苯硫酚或者4,4′-联吡啶分子后,能观察到明显的表面拉曼增强效应.制膜方法工艺简单,成本低,能制备大面积纳米结构金膜,且这种纳米结构的金膜在分子探测方面有应用前景.

A new method to fabricate nanostructure at gold film surface through interfacial diffusion process is described.A Cu/Au double layer film was prepared by vacuum evaporation,thereafter,annealing,and chemical etching was used to remove the component of copper,gold film with single-sided nanoporous was yielded.The surface morphology of the Au film was analyzed by scanning electronic microscope（SEM）,the influence of temperature and time duration on nano-structure in annealing was discussed.When a mono-layer of p-thiocresol or 4,4′-bipyridine was adsorbed on the surface of this nanoporous gold film,surface-enhanced Raman scattering（SERS） was identified.The present simple and low cost fabrication process could result in single-sided nanoporous gold film with large area,which may promise potential application in molecule probing.