Enhanced ultraviolet emission from poly(vinyl alcohol) ZnO nanoparticles using a SiO2-Au core/shell structure.
Enhanced ultraviolet emission from poly(vinyl alcohol) ZnO nanoparticles using a SiO2-Au core/shell structure.
复制标题
DOI：
10.1021/nl3031955
复制
发表时间：
2012-10
期刊：
影响因子：
10.8
通讯作者：
Dali Shao;Hongtao Sun;Mingpeng Yu;J. Lian;S. Sawyer
中科院分区：
文献类型：
--
作者：
Dali Shao;Hongtao Sun;Mingpeng Yu;J. Lian;S. Sawyer
采用SiO（2）-Au核/壳纳米结构增强了PVA-ZnO纳米粒子的近带隙边（NBE）发射，而缺陷能级发射（DLE）得到了极大的抑制。在554 nm处，用SiO（2）-Au作发光材料，其发光强度最大可增强近400%。SiO（2）-Au核/壳纳米结构还显示出比纯金属纳米颗粒更上级的共振能量可调性。NBE发射的增强和DLE的抑制归因于表面等离子体激元激发的高能电子从金属纳米颗粒转移到ZnO纳米颗粒的导带。
Enhanced near band gap edge (NBE) emissions of PVA-ZnO nanoparticles were achieved by employing SiO(2)-Au core/shell nanostructures whereas the defect-level emission (DLE) is greatly suppressed. A maximum enhancement of nearly 400% was observed using SiO(2)-Au for the emission with optical resonance at 554 nm. SiO(2)-Au core/shell nanostructures also show a superior tunability of resonance energy as compared to that of the pure metal nanoparticles. The enhancement of the NBE emission and suppressed DLE is ascribed to the transfer of the energetic electrons excited by surface plasmon from metal nanoparticles to the conduction band of ZnO nanoparticles.