Ag Nanotwin-Assisted Grain Growth-Induced by Stress in SiO₂/Ag/SiO₂ Nanocap Arrays.

Ag Nanotwin-Assisted Grain Growth-Induced by Stress in SiO₂/Ag/SiO₂ Nanocap Arrays.
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SiO2/Ag/SiO2 纳米帽阵列中应力诱导银纳米孪晶辅助晶粒生长

DOI:
10.3390/nano8060436
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发表时间:
2018-06-14
期刊:
Nanomaterials (Basel, Switzerland)
影响因子:
--
通讯作者:
Yang J
Yang J
中科院分区:
其他
文献类型:
--
作者:
Zhang F;Wang Y;Zhang Y;Chen L;Liu Y;Yang J

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在二维模板上制备了三层SiO2/Ag/SiO2纳米帽阵列。在不同温度下退火,SiO2/Ag/SiO2纳米cap阵列的曲率增大,导致Ag纳米cap收缩。弯曲SiO2层提供的应力诱导银纳米孪晶的形成。当邻近纳米孪晶改变局部取向时,银纳米孪晶有助于纳米颗粒的生长。纳米帽的收缩降低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粒子之间的SPR耦合,导致局域表面等离子体共振(LSPR)带红移,降低了表面增强拉曼散射(SERS)信号。
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.
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