Optical properties and growth aspects of silver nanoprisms produced by a highly reproducible and rapid synthesis at room temperature
Optical properties and growth aspects of silver nanoprisms produced by a highly reproducible and rapid synthesis at room temperature
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DOI：
10.1002/adfm.200800233
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发表时间：
2008-07-23
影响因子：
19
通讯作者：
Kelly, John M.
中科院分区：
文献类型：
--
作者：
Aherne, Damian;Ledwith, Deirdre M.;Kelly, John M.
提出了一种快速且容易再现的基于种子的方法，用于生产高产量的高质量银纳米op。可以通过调整反应条件来容易控制纳米甲的主要等离子体共振的边缘长度和位置。从纳米裔溶液的UV-VIS光谱中，测量了面内偶极等离子体等离子体共振的不均匀宽线宽度，并且已经阐明了等离子体阻尼的程度，趋势是等离子体共振能量和纳米op子的功能。此外，还提供了对银纳米op的层状缺陷结构的深入分析，证实了缺陷可以导致缺陷附近晶体结构的转化。这些缺陷可以组合产生层状区域的层状区域，比1边缘厚度延伸到整个晶体，在该晶体中，银原子在连续的六角形al-close填充（HCP）结构中排列。这种HCP结构的周期性为2.50a，因此解释了在111）方向的平扁纳诺普里中通常观察到的2.50a晶格条纹。对银色纳米二旋转的各向异性生长背后的机制有了新的理解。
A rapid and readily reproducible seed-based method for the production of high quality silver nanoprisms in high yield is presented. The edge-length and the position of the main plasmon resonance of the nanoprisms can be readily controlled through adjustment of reaction conditions. From UV-vis spectra of solutions of the nanoprisms, the inhomogeneously broadened line width of the in-plane dipole plasmon resonance is measured and trends in the extent of plasmon damping as a function of plasmon resonance energy and nanoprism size have been elucidated. In addition, an in-depth analysis of the lamellar defect structure of silver nanoprisms is provided that confirms that the defects can lead to a transformation of the crystal structure in the vicinity of the defects. These defects can combine give rise to lamellar regions, thicker than 1 rim, that extend across the crystal, where the silver atoms are arranged in a continuous hexagon al-close-packed (hcp) structure. This hcp structure has a periodicity of 2.50A, thus explaining the 2.50A lattice fringes that are commonly observed in 111) oriented flat-lying nanoprisms. A new understanding of the mechanisms behind anisotropic growth in silver nanoprisms is presented.