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Preparation and characterization of gold-coated silver triangular platelets in nanometer scale

机译：纳米金包银三角片的制备与表征

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Colloids of triangular silver platelets and the platelets coated with a layer of gold have been prepared and analyzed by dynamic light scattering (DLS), transmission electron microscopy (TEM), high-resolution electron microscopy (HRTEM), ultraviolet-visible spectroscopy (UV-vis). The particle size distribution measured by DLS indicates the Ostwald ripening process in evolution of triangles is fed by small spherical particles during light illumination. The shape of most particles is a truncated equilateral triangle and the degree of truncation decreases as the size increases. Triangular platelets are of edge length 50-60 nm and thickness 6-10 nm. The edge length increases to 60-90 nm after depositing a gold layer. To preserve the triangular geometry, a gold layer of thickness less than 5 nm is preferred. The epitaxial nature of gold grown on the {111}{1 (1) over bar0} planes of the silver crystal is clearly illustrated in HRTEM images when the thickness of gold is less than I or 2 nm. A moire fringe is usually observed when the An thickness is higher than 5 nm. The moire fringe is simulated by rotating two overlapped lattices of the same spacing. The peak position of in-plane dipole resonance at 680 nm is sensitive to the degree of truncation of silver triangle. It shifts towards 615 nm owing to corner rounding by the heat. The gold coating broadens and shifts the peak of in-plane resonance toward shorter wavelengths, hence the cool blue color changes into a warmer color. (C) 2004 Elsevier B.V. All rights reserved.
机译：已制备并通过动态光散射（DLS），透射电子显微镜（TEM），高分辨率电子显微镜（HRTEM），紫外可见光谱（UV-UV）分析了三角形银血小板的胶体和涂有金层的血小板可见）。通过DLS测量的粒度分布表明，在光照过程中，球形小颗粒为三角形演化提供了奥斯特瓦尔德熟化过程。大多数粒子的形状是一个截顶的等边三角形，截头的程度随尺寸的增加而减小。三角形血小板的边缘长度为50-60 nm，厚度为6-10 nm。沉积金层后，边长增加到60-90 nm。为了保持三角形的几何形状，优选厚度小于5nm的金层。当金的厚度小于1或2 nm时，在HRTEM图像中清楚地显示了在银晶体的bar0}面上{111} {1（1）（1）上生长的金的外延性质”。当厚度大于5 nm时，通常会观察到莫尔条纹。通过旋转两个相同间距的重叠格子来模拟莫尔条纹。平面内偶极子共振在680 nm处的峰值位置对银三角的截断度敏感。由于热量使圆角变圆，它移向615 nm。金涂层使面内共振的峰变宽并向较短波长移动，因此冷蓝色变成暖色。 （C）2004 Elsevier B.V.保留所有权利。

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