School of Science, Nantong University, Jiangsu 226007, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Oct;96:820-4. doi: 10.1016/j.saa.2012.07.090. Epub 2012 Aug 3.
Ag films on Si substrates were fabricated by immersion plating, which served as sacrificial materials for preparation of Ag/Au bimetallic films by galvanic replacement method. SEM images displayed that the sacrificial Ag films presenting island morphology experienced interesting structural evolution process during galvanic replacement reaction, and nano-scaled holes were formed in the resultant bimetallic films. SERS measurements using crystal violet as an analyte showed that SERS intensities of bimetallic films were enhanced significantly compared with that of pure Ag films and related mechanisms were discussed. Immersion plating experiment carried out on Ag films on PEN substrates fabricated by photoinduced reduction method further confirmed that galvanic replacement is an easy method to fabricate Ag/Au bimetallic and a potential approach to improve the SERS performance of Ag films.
采用浸渍镀的方法在 Si 衬底上制备了 Ag 薄膜，该薄膜可用作通过电置换方法制备 Ag/Au 双金属薄膜的牺牲材料。SEM 图像显示，具有岛状形态的牺牲 Ag 薄膜在电置换反应过程中经历了有趣的结构演化过程，并且在所得双金属薄膜中形成了纳米级孔。使用结晶紫作为分析物进行的 SERS 测量表明，与纯 Ag 薄膜相比，双金属薄膜的 SERS 强度显著增强，并讨论了相关机制。通过光致还原法在 PEN 衬底上制备的 Ag 薄膜上进行的浸渍镀实验进一步证实，电置换是一种制备 Ag/Au 双金属的简单方法，也是提高 Ag 薄膜 SERS 性能的一种有潜力的方法。
