Institute of Physical Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.
Nanoscale. 2018 Nov 15;10(44):20640-20651. doi: 10.1039/c8nr06738d.
2D copper sulfide nanocrystals are promising building blocks of plasmonic materials in the near-infrared (NIR) spectral region. We demonstrate precise shape and size control (hexagonal/triangle) of colloidal plasmonic copper sulfide (covellite) nano-prisms simply by tuning the precursor concentration without the introduction of additional ligands. The ultra-thin 2D nanocrystals possess sizes between 13 and 100 nm and triangular or hexangular shapes. We also demonstrate CuS nanosheets (NSs) with lateral sizes up to 2 microns using a syringe pump. Based on the experimental findings and DFT simulations, we propose a qualitative and quantitative mechanism for the formation of different shapes. The analysis of the spectral features in the NIR region of the synthesized CuS nanocrystals has been performed with respect to the shape and the size of particles by the discrete dipole approximation method and the Drude-Sommerfeld theory.
2D 硫化铜纳米晶体是近红外（NIR）光谱区域中等离子体材料有前途的构建块。我们通过简单地调整前驱体浓度来证明胶体等离子体铜硫化物（辉铜矿）纳米棱镜的精确形状和尺寸控制（六边形/三角形），而无需引入额外的配体。超薄的 2D 纳米晶体具有 13 至 100nm 之间的尺寸和三角形或六边形形状。我们还使用注射器泵展示了具有高达 2 微米的横向尺寸的 CuS 纳米片（NS）。基于实验结果和 DFT 模拟，我们提出了一种定性和定量的形成不同形状的机制。通过离散偶极子近似方法和 Drude-Sommerfeld 理论，对合成 CuS 纳米晶体的 NIR 区域的光谱特征进行了分析，考虑了颗粒的形状和尺寸。
