应力诱导的SiO₂/Ag/SiO₂纳米帽阵列中银纳米孪晶辅助的晶粒生长

Zhang Fan, Wang Yaxin, Zhang Yongjun, Chen Lei, Liu Yang, Yang Jinghai

Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China.

College of Physics, Jilin Normal University, Siping 136000, China.

Nanomaterials (Basel). 2018 Jun 14;8(6):436. doi: 10.3390/nano8060436.

A trilayer SiO₂/Ag/SiO₂ nanocap array was prepared on a two-dimensional template. When annealed at different temperatures, the curvature of the SiO₂/Ag/SiO₂ nanocap arrays increased, which led to Ag nanocap shrinkage. The stress provided by the curved SiO₂ layer induced the formation of Ag nanotwins. Ag nanotwins assisted the growth of nanoparticles when the neighboring nanotwins changed the local misorientations. Nanocap shrinkage reduced the surface plasmon resonance (SPR) coupling between neighboring nanocaps; concurrently, grain growth decreased the SPR coupling between the particles in each nanocap, which led to a red shift of the localized surface plasmon resonance (LSPR) bands and decreased the surface-enhanced Raman scattering (SERS) signals.

在二维模板上制备了三层SiO₂/Ag/SiO₂纳米帽阵列。当在不同温度下退火时，SiO₂/Ag/SiO₂纳米帽阵列的曲率增加，导致Ag纳米帽收缩。弯曲的SiO₂层提供的应力诱导了Ag纳米孪晶的形成。当相邻纳米孪晶改变局部取向差时，Ag纳米孪晶促进了纳米颗粒的生长。纳米帽收缩减少了相邻纳米帽之间的表面等离子体共振（SPR）耦合；同时，晶粒生长降低了每个纳米帽中颗粒之间的SPR耦合，这导致局域表面等离子体共振（LSPR）带发生红移，并降低了表面增强拉曼散射（SERS）信号。