Kozioł Robert, Łapiński Marcin, Syty Paweł, Koszelow Damian, Sadowski Wojciech, Sienkiewicz Józef E, Kościelska Barbara
Faculty of Applied Physics and Mathematics, Department of Solid State Physics, Gdansk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdansk, Poland.
Faculty of Applied Physics and Mathematics, Department of Theoretical Physics and Quantum Information, Gdansk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdansk, Poland.
Beilstein J Nanotechnol. 2020 Mar 25;11:494-507. doi: 10.3762/bjnano.11.40. eCollection 2020.
Ag-based plasmonic nanostructures were manufactured by thermal annealing of thin metallic films. Structure and morphology were studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). SEM images show that the formation of nanostructures is influenced by the initial layer thickness as well as the temperature and the time of annealing. The Ag 3d and Ag 4d XPS spectra are characteristic of nanostructures. The quality of the nanostructures, in terms of their use as plasmonic platforms, is reflected in the UV-vis absorption spectra. The absorption spectrum is dominated by a maximum in the range of 450-500 nm associated with the plasmon resonance. As the initial layer thickness increases, an additional peak appears around 350 nm, which probably corresponds to the quadrupole resonance. For calculations leading to a better illustration of absorption, scattering and overall absorption of light in Ag nanoparticles, the Mie theory is employed. Absorbance and the distribution of the electromagnetic field around the nanostructures are calculated by finite-difference time-domain (FDTD) simulations. For calculations a novel approach based on modelling the whole sample with a realistic shape of the nanoparticles, instead of full spheres, was used. This led to a very good agreement with the experiment.
基于银的等离子体纳米结构是通过对金属薄膜进行热退火制备的。使用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HR-TEM）和X射线光电子能谱（XPS）研究了其结构和形态。SEM图像表明，纳米结构的形成受初始层厚度以及退火温度和时间的影响。Ag 3d和Ag 4d XPS光谱是纳米结构的特征。纳米结构作为等离子体平台的质量在紫外-可见吸收光谱中得到体现。吸收光谱以450-500nm范围内与等离子体共振相关的最大值为主。随着初始层厚度的增加，在350nm左右出现一个额外的峰，这可能对应于四极共振。为了进行计算以更好地说明银纳米颗粒对光的吸收、散射和整体吸收，采用了米氏理论。通过有限时域差分（FDTD）模拟计算纳米结构周围的吸光度和电磁场分布。在计算中，使用了一种基于对具有实际纳米颗粒形状而非完整球体的整个样品进行建模的新方法。这与实验结果非常吻合。
