School of Mathematical and Physical Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.
Nanotechnology. 2018 Oct 5;29(40):40LT02. doi: 10.1088/1361-6528/aad34b. Epub 2018 Jul 13.
In order to advance plasmon-based technologies, new materials with low damping losses and high chemical stability are needed. In this letter, we report the bulk scale fabrication of sodium tungsten bronze (Na WO) nanoparticles with high Na content (x ≤ 0.83) using a furnace-assisted method. Phase purity and morphology is confirmed with x-ray diffraction and scanning electron microscopy. Plasmon responses are characterized using spectrophotometry and spatially-resolved electron energy-loss spectroscopy (EELS) in a scanning transmission electron microscope. Experimental EELS maps of individual nanoparticles show the excitation of distinct plasmon resonances at visible and near-infrared (NIR) frequencies, and these observations are supported by boundary element method simulations. Na WO is a promising alternative material for plasmonics due to its strong plasmon resonances when compared to Au, its simple nanofabrication, and low cost. In particular, their high NIR extinction makes these materials ideal for applications in solar control window coatings or plasmonic photocatalysis.
为了推进基于等离子体的技术，需要具有低阻尼损耗和高化学稳定性的新材料。在这封信件中，我们报告了使用炉辅助法批量制备具有高钠含量（x≤0.83）的钠钨青铜（Na WO）纳米粒子。X 射线衍射和扫描电子显微镜证实了其相纯度和形态。使用分光光度法和扫描透射电子显微镜中的空间分辨电子能量损失光谱（EELS）对等离子体响应进行了表征。单个纳米粒子的实验 EELS 图谱显示，在可见光和近红外（NIR）频率下激发了独特的等离子体共振，这些观察结果得到了边界元法模拟的支持。与 Au 相比，Na WO 具有较强的等离子体共振、简单的纳米制造工艺和低成本，是等离子体学的一种很有前途的替代材料。特别是，它们在近红外的高消光率使得这些材料非常适合用于太阳能控制窗涂层或等离子体光催化等应用。
