Zhang Fan, Guo Shuang, Liu Yang, Chen Lei, Wang Yaxin, Gao Renxian, Zhu Aonan, Zhang Xiaolong, Zhang Yongjun
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China.
College of Chemistry, Jilin Normal University, Siping 136000, China.
Nanomaterials (Basel). 2018 Jul 5;8(7):493. doi: 10.3390/nano8070493.
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.
通过在磁控溅射系统中共同溅射银和二氧化硅，在二维有序胶体（2D）聚苯乙烯球体模板上制备了Ag⁻SiO₂纳米棒阵列。通过调整二维模板的蚀刻时间来控制纳米棒的横向尺寸以及相邻纳米棒之间的距离。纳米棒由二氧化硅隔离的银纳米颗粒组成，这些颗粒产生表面增强拉曼散射（SERS）增强，并且在相邻纳米棒之间形成了三维热点。当纳米棒之间的距离足够大时，在硅衬底上观察到三角形纳米结构，这也有助于增强SERS信号。使用时域有限差分（FDTD）方法计算Ag⁻SiO₂纳米棒阵列中的电磁场分布，这为SERS信号的变化产生了物理原因。
