以密堆积的700 nm单分散聚苯乙烯微球为模板, 采用多电流阶跃方法制备了不同深度的二维有序微/纳尺度银球腔阵列。 通过扫描电子显微镜, 反射紫外对球腔形貌及表面等离子体共振进行了表征, 以对氨基苯硫酚及罗丹明6G为探针分子进行了表面增强拉曼光谱(SERS)的研究。 结果表明, 通过控制电化学沉积的条件可以实现对球腔形貌的控制。 以该种球腔阵列作为SERS基底, 其增强因子可达107, 并具有良好的信号重现性, 信号间相对标准偏差小于8%。 该基底用于对罗丹明6G的定量检测, 检测限可达0.1 ng·mL-1。

The highly ordered two dimensional micro-/nano-sized silver cavity was fabricated by galvanostatic multistep method using ordered arrays of close-packed 700 nm diameter polystyrene spheres as templates. The morphology and the surface plasmon resonance of this silver cavity array were characterized by scanning electron microscope and reflectance UV-Vis spectra, and surface-enhanced Raman scattering (SERS) spectra of p-aminothiophenol (PATP) and Rhodamine 6G (R6G) on as-prepared substrate were also studied. The results show that: the depth of cavities can be easily regulated through varying the parameters of the electrochemical deposition. As SERS substrates for the detection of PATP molecules, the two dimensional Ag cavity arrays exhibit excellent performance and the enhancement factors can be as high as the 107 order. In addition to the high-intensity enhancement, it is also found that the SERS spectra are highly reproducible on this Ag cavity arrays. The relative standard deviation of the peak intensity of PATP molecules at 1 077 cm-1 was calculated to be 8.4%. The as-prepated substrate can be used for the quantitative detection of R6G, and the detection limit reaches as low as 0.1 ng·mL-1.