采用化学还原法制备了花状纳米银凝胶溶胶，沉积在硅片、二氧化钛薄膜、玻璃上，制备得到了AgNP@Si，AgNP@TiO2，AgNP@G 3种表面增强拉曼基底。以罗丹明6G（R6G）为探针分子，考察了3种基底的表面增强拉曼效果，重复性及均匀性。AgNP@TiO2和AgNP@Si的检出限为10-8mol·L-1，而AgNP@G的检出限为10-7 mol·L-1，AgNP@Si的重复性和均匀性最优。结果表明，AgNP@Si的SERS增强效果最佳，并具有制备简单，重复性和均匀性好等优点。

We prepared the flower-like silver nanoparticles by using chemical reduction method and deposited it on silicon wafer, TiO2 film and glass plate (AgNP@Si, AgNP@TiO2, AgNP@G) separately in order to get substrates for surface enhanced Raman spectroscopy. The repeatability, sensitivity and uniformity of these substrates were studied by using R6G solution. The detection limit of AgNP@TiO2 and AgNP@Si was 10-8 mol·L-1, while the AgNP@G was 10-7 mol·L-1. Meanwhile, Repeatability and uniformity of AgNP@Si are better than others. The results show that the AgNP@Si has the best Raman enhancement effect, the simple preparation, good repeatability and uniformity.