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首页> 外文期刊>Nanotechnology, IEEE Transactions on >Morphological and Optical Evolution of Silver Nanoparticles on Sapphire (0001) Along With the Concurrent Influence of Diffusion, Ostwald's Ripening, and Sublimation
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Morphological and Optical Evolution of Silver Nanoparticles on Sapphire (0001) Along With the Concurrent Influence of Diffusion, Ostwald's Ripening, and Sublimation

机译：蓝宝石（0001）上银纳米颗粒的形貌和光学演化以及扩散，奥斯特瓦尔德熟化和升华的同时影响

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摘要

Silver nanoparticles (Ag NPs) have found a number of applications in various fields such as optoelectronics, sensors, and catalysts, and the optical, physical, and chemical properties of Ag NPs can be modified by the control of size, density, and configuration as well as their spacing. Therefore, in this paper, we demonstrate the size, shape, and spacing control of Ag NPs by the systematic control of annealing duration between 0 and 3600 s on sapphire (0001) (Al2O3). The Ag NPs show a sharp distinction in morphology along with the controlled duration at 20 and 14 nm thickness, and the evolution trend is systematically discussed based on the concurrent influence of surface diffusion, Ostwald's ripening, and sublimation. With the relatively thicker film of 20 nm, the fabrication of irregular and round NPs is demonstrated along with the gradually reduced size up on the annealing at 750 °C for the duration between 0 and 900 s. Between 1800 and 3600 s, tiny grain-like particles result as a consequence of an extensive sublimation. Meanwhile, with the film thickness of 14 nm at 400 °C, densely packed small NPs are resulted between 0 and 3600 s due to the limited surface diffusion. At the same time, the optical characterizations such as Raman and reflectance spectroscopy show a distinctive trend of spectra, i.e., intensity, peak position, and FWHM, based on the evolution of Ag NPs and are discussed in conjunction with the specific morphology and surface coverage of the Ag NPs.
机译：银纳米颗粒（Ag NPs）已在光电子，传感器和催化剂等各个领域找到了许多应用，并且可以通过控制尺寸，密度和结构来改变Ag NPs的光学，物理和化学性质。以及它们的间距。因此，在本文中，我们通过对蓝宝石（0001）（Al2O3）的退火持续时间在0到3600 s之间的系统控制，证明了Ag NP的尺寸，形状和间距控制。 Ag NPs在20 nm和14 nm厚度下具有可控的持续时间，在形态上有明显的区别，并且根据表面扩散，Ostwald的成熟和升华的共同影响系统地讨论了演化趋势。使用相对较厚的20 nm薄膜，可以证明制备了不规则和圆形的NP，并且随着在750°C下退火0至900 s的时间，尺寸逐渐减小。在1800到3600 s之间，由于大量升华而形成了细小的颗粒状颗粒。同时，在400°C时，膜厚为14 nm，由于有限的表面扩散，在0至3600 s之间产生了密集堆积的小NP。同时，基于银纳米颗粒的演化，拉曼光谱和反射光谱等光学表征显示出独特的光谱趋势，即强度，峰位置和半峰宽，并结合特定的形态和表面覆盖率进行了讨论。纳米银的数量。

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