Metal-Core/Dielectric-Shell/Metal-Cap Composite Nanoparticle for Upconversion Enhancement
Metal-Core/Dielectric-Shell/Metal-Cap Composite Nanoparticle for Upconversion Enhancement
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用于上转换增强的金属核/介电壳/金属帽复合纳米粒子
DOI：
10.1021/acs.jpcc.8b05211
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Fujii Minoru
中科院分区：
文献类型：
--
作者：
Hinamoto Tatsuki;Sugimoto Hiroshi;Fujii Minoru
我们开发了一种由金属核、上转换壳和金属帽组成的上转换复合纳米粒子。纳米复合材料的数值模拟表明，杂交的本地化的表面等离子体模式的核心和帽的结果在新的成键和反键模式的出现。后一模式在谐振波长上具有宽的可调谐性，在上转换壳层处具有强的场限制。对于复合纳米粒子的制造，我们开发了一种结合液相合成和气相沉积工艺的工艺。单个复合纳米粒子的散射光谱与数值模拟结果吻合较好。比较了金属核/介电壳结构和金属核/介电壳/金属帽结构的上转换发光强度，发现帽的形成使上转换发光强度提高了几倍。
We have developed an upconversion composite nanoparticle composed of a metal core, an upconversion shell, and a metal cap. Numerical simulation of the nanocomposite revealed that hybridization of the localized surface plasmon modes of the core and the cap results in the emergence of novel bonding and antibonding modes. The latter mode has wide tunability in the resonance wavelength and strong field confinement at the position of the upconversion shell. For the fabrication of the composite nanoparticle, we developed a process that combines liquid-phase synthesis and vapor deposition processes. The scattering spectra of single composite nanoparticles agreed well with those in the numerical simulation. The comparison of the upconversion intensity between the metal-core/dielectric-shell structure and the metal-core/dielectric-shell/metal-cap structure revealed that the cap formation increases the intensity several folds.