论文标题
通过电子能量损耗光谱法测量局部表面等离子共振的影响
Influence of experimental conditions on localized surface plasmon resonances measurement by electron energy loss spectroscopy
论文作者
论文摘要
扫描透射电子显微镜（Stem）与电子能量损耗光谱（EEL）结合使用，已成为一种标准技术，用于绘制纳米空间空间的局部表面等离子体共振，并且在过去15年中具有足够的能量分辨率。但是，到目前为止，还没有讨论测量过程中实验条件的影响的实验工作。我们介绍了一项实验研究，该研究对主要束能量和收集半角度对血管蜂物共振测量的影响。为了探索这两个实验参数的影响，我们研究了一系列金棒，金领带和diabolo天线。我们讨论了对实验特征的影响，这对于成功检测鳗鱼中的血浆峰很重要，即：等离激元信号的强度，信号与背景比以及信号与零损坏峰值比。我们表明，在我们的情况120 keV中，使用中等原代束能和任意收集的半角度获得了最佳结果，因为它不是此主梁能量的关键参数。我们的启发性概述将有助于血浆中的显微镜分组来安排其实验。
Scanning transmission electron microscopy (STEM) combined with electron energy loss spectroscopy (EELS) has become a standard technique to map localized surface plasmon resonances with a nanometer spatial and a sufficient energy resolution over the last 15 years. However, no experimental work discussing the influence of experimental conditions during the measurement has been published up to now. We present an experimental study of the influence of the primary beam energy and the collection semi-angle on the plasmon resonances measurement by STEM-EELS. To explore the influence of these two experimental parameters we study a series of gold rods and gold bow-tie and diabolo antennas. We discuss the impact on experimental characteristics which are important for successful detection of the plasmon peak in EELS, namely: the intensity of plasmonic signal, the signal to background ratio, and the signal to zero-loss peak ratio. We show that the best results are obtained using a medium primary beam energy, in our case 120 keV, and an arbitrary collection semi-angle, as it is not a critical parameter at this primary beam energy. Our instructive overview will help microscopists in the field of plasmonics to arrange their experiments.
