Magnesium Nanoparticle Plasmonics
Magnesium Nanoparticle Plasmonics
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DOI：
10.1021/acs.nanolett.8b00955
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发表时间：
2018-06-01
期刊：
影响因子：
10.8
通讯作者：
Ringe, Emilie
中科院分区：
文献类型：
--
作者：
Biggins, John S.;Yazdi, Sadegh;Ringe, Emilie
某些金属（Cu/Ag/Au）的纳米颗粒维持其电子云的振荡，称为局域表面等离子体共振（LSPR）。这些共振可以发生在光学频率，并由光驱动，产生增强的电场和壮观的光子散射。然而，目前的等离子体金属是稀有的、昂贵的，并且具有有限的谐振频率范围。近年来，大量的研究集中在富含稀土元素的铝纳米颗粒上，但铝纳米颗粒不能在红外波段共振，本文报道的富含稀土元素的镁纳米颗粒克服了这一限制。胶体合成形成六边形纳米片，反映了Mg的简单六边形晶格。NP形成薄的自限性氧化物层，这使得它们稳定地悬浮在2-丙醇溶液中数月，并在空气中干燥至少两周。他们维持在远场可观察到的光散射光谱的LSPR。电子能量损失谱实验和模拟揭示了多个尺寸依赖的共振能量跨越紫外线，可见光和红外线的模式的对称性和它们与底层基板的相互作用进行了研究，使用数值方法。因此，胶体合成的Mg提供了一种廉价、稳定的纳米颗粒的途径，这些纳米颗粒具有新颖的形状和跨越整个UV-vis-NIR光谱的共振，使它们成为纳米等离子体工具箱的灵活补充。
Nanoparticles of some metals (Cu/Ag/Au) sustain oscillations of their electron cloud called localized surface plasmon resonances (LSPRs). These resonances can occur at optical frequencies and be driven by light, generating enhanced electric fields and spectacular photon scattering. However, current plasmonic metals are rare, expensive, and have a limited resonant frequency range. Recently, much attention has been focused on earth-abundant Al, but Al nanoparticles cannot resonate in the IR The earth-abundant Mg nanoparticles reported here surmount this limitation. A colloidal synthesis forms hexagonal nanoplates, reflecting Mg's simple hexagonal lattice. The NPs form a thin self-limiting oxide layer that renders them stable suspended in 2-propanol solution for months and dry in air for at least two week. They sustain LSPRs observable in the far-field by optical scattering spectroscopy. Electron energy loss spectroscopy experiments and simulations reveal multiple size-dependent resonances with energies across the UV, visible, and IR The symmetry of the modes and their interaction with the underlying substrate are studied using numerical methods. Colloidally synthesized Mg thus offers a route to inexpensive, stable nanoparticles with novel shapes and resonances spanning the entire UV-vis-NIR spectrum, making them a flexible addition to the nanoplasmonics toolbox.