Yin Hong Jun, Chan Yu Fei, Wu Zheng Long, Xu Hai Jun
Opt Lett. 2014 Jul 15;39(14):4184-7. doi: 10.1364/OL.39.004184.
High-density ZnO nanocombs were first grown on a nanoporous silicon pillar array, and pre-prepared 3D Si/ZnO/Ag nanocomb arrays were employed as substrates for surface-enhanced Raman scattering (SERS). The finite-difference time-domain simulation result shows that two kinds of inter-Ag-NP nanogaps in the geometry create a large number of SERS "hot spots," which contributes to the detection limits for rhodamine-6G as low as 10⁻¹² M and the Raman enhancement factor as large as 10⁹. The linear dependence between the Raman peak intensities and the concentrations of thiram provides a new calibration method for rapid and quantitative detection of trace organic molecules.
首先在纳米多孔硅柱阵列上生长高密度氧化锌纳米梳，并将预先制备的3D硅/氧化锌/银纳米梳阵列用作表面增强拉曼散射（SERS）的基底。时域有限差分模拟结果表明，该几何结构中的两种银纳米颗粒间纳米间隙产生了大量SERS“热点”，这使得罗丹明-6G的检测限低至10⁻¹² M，拉曼增强因子高达10⁹。拉曼峰强度与福美双浓度之间的线性关系为痕量有机分子的快速定量检测提供了一种新的校准方法。
