Tian Yue, Zhang Hua, Xu Linlin, Chen Ming, Chen Feng
Opt Lett. 2018 Feb 15;43(4):635-638. doi: 10.1364/OL.43.000635.
The bimetallic Au/Ag self-assembled monolayers (SAMs) were constructed by using mono-dispersed Au/Ag nanospheres (Ag: 4.07%-34.53%) via evaporation-based assembly strategy. The composition-dependent surface-enhanced Raman scattering (SERS) spectroscopy revealed that the Au/Ag (Ag: 16.83%) SAMs provide maximized activity for triphenylmethane dyes detection. With the inter-metallic synergy, the optimized SAMs enable the Raman intensity of crystal violet molecules to be about 223 times higher than that of monometallic Au SAMs. Moreover, the SERS signals with excellent uniformity (<5% variation) are sensitive down to 10 M concentrations because of the optimal matching between bimetallic plasmon resonance and the incident laser wavelength.
通过基于蒸发的组装策略，使用单分散的金/银纳米球（银含量为4.07%-34.53%）构建了双金属金/银自组装单分子层（SAMs）。成分依赖的表面增强拉曼散射（SERS）光谱表明，金/银（银含量为16.83%）自组装单分子层为三苯甲烷染料检测提供了最大化的活性。通过金属间协同作用，优化后的自组装单分子层使结晶紫分子的拉曼强度比单金属金自组装单分子层高约223倍。此外，由于双金属等离子体共振与入射激光波长的最佳匹配，具有优异均匀性（变化<5%）的SERS信号在低至10 M的浓度下仍很灵敏。
