Controlling the 3D Electromagnetic Coupling in Co-Sputtered Ag⁻SiO₂ Nanomace Arrays by Lateral Sizes.
Controlling the 3D Electromagnetic Coupling in Co-Sputtered Ag⁻SiO₂ Nanomace Arrays by Lateral Sizes.
复制标题
通过横向尺寸控制共溅射 Ag-SiO2 纳米阵列中的 3D 电磁耦合
DOI：
10.3390/nano8070493
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发表时间：
2018-07-05
期刊：
影响因子：
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通讯作者：
Zhang Y
中科院分区：
文献类型：
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作者：
Zhang F;Guo S;Liu Y;Chen L;Wang Y;Gao R;Zhu A;Zhang X;Zhang Y
采用磁控溅射法在二维有序聚苯乙烯球模板上制备了Ag-SiO2纳米阵列。通过调节二维模板的刻蚀时间来控制纳米微球的横向尺寸和相邻纳米微球之间的距离。纳米棒由SiO2隔离的Ag纳米颗粒组成，其产生表面增强拉曼散射（Sers）增强，并且在相邻纳米棒之间产生3D热点。当纳米线间距足够大时，在硅衬底上观察到三角形的纳米结构，这也有助于增强Sers信号。采用时域有限差分法（FDTD）计算了Ag-SiO2纳米阵列中的电磁场分布，分析了产生Sers信号变化的物理原因。
Ag–SiO2 nanomace arrays were prepared on a two-dimensional ordered colloidal (2D) polystyrene sphere template by co-sputtering Ag and SiO2 in a magnetron sputtering system. The lateral size of the nanomaces and the distance between the neighbor nanomaces were controlled by adjusting the etching time of the 2D template. The nanomaces were composed of SiO2-isolated Ag nanoparticles, which produced surface-enhanced Raman scattering (SERS) enhancement, and 3D hot spots were created between the neighbor nanomaces. When the distance between the nanomaces was sufficiently large, triangle-shaped nanostructures on silicon substrate were observed, which also contributed to the enhancement of the SERS signals. The finite-difference time-domain (FDTD) method was used to calculate the electromagnetic field distributions in the Ag–SiO2 nanomace arrays, which generated physical reasons for the change of the SERS signals.