Strain-engineered photoluminescence of confined Ag nanocrystals
Strain-engineered photoluminescence of confined Ag nanocrystals
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DOI：
10.1016/j.jallcom.2016.07.088
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发表时间：
2016-12
影响因子：
6.2
通讯作者：
Xian You;C. Yuan;Y. Mei;Wenyan Wei;Ting Yu;Xingfang Luo
中科院分区：
文献类型：
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作者：
Xian You;C. Yuan;Y. Mei;Wenyan Wei;Ting Yu;Xingfang Luo
采用脉冲激光沉积方法和快速热退火技术制备了限制在非晶 Al2O3 和 HfO2 基体中的银纳米晶体。研究发现Ag纳米晶的微观结构和光致发光与应变密切相关。 Al2O3基体中Ag纳米晶存在的压应变比HfO2基体中存在的压应变强得多。因此，在相同的生长条件下，Al2O3基体中生长的Ag纳米晶的尺寸和键长均小于HfO2基体中生长的Ag纳米晶的尺寸和键长。此外，与Al2O3基质中生长的Ag纳米晶体相比，应变诱导的HfO2基质中限制的Ag纳米晶体表面的非辐射缺陷更少，这导致HfO2基质中限制的Ag纳米晶体的PL显着增强。目前的发现表明有机会通过应变工程的应用积极设计和增强银纳米晶体的光学特性。
Ag nanocrystals confined in amorphous Al2O3and HfO2matrices were fabricated using the pulsed laser deposition method and rapid thermal annealing technique. It is found that the microstructures and photoluminescence of Ag nanocrystals are closely related with strain. The compressive strain existing at the Ag nanocrystals in Al2O3matrix is much stronger than that in HfO2matrix. Consequently, at the same growth conditions, the size and bonds lengths of the Ag nanocrystals grown in Al2O3matrix are smaller than those of Ag nanocrystals grown in HfO2matrix. Moreover, less nonradiative defects at the surface of Ag nanocrystal confined in HfO2matrix than those of Ag nanocrystals grown in Al2O3matrix are induced by the strain, which leads to significantly enhanced PL of Ag nanocrystals confined in HfO2matrix. The present findings indicate the opportunity to actively engineer and enhance the optical properties of silver nanocrystals through the application of strain engineering.