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首页> 外文期刊>Crystal growth & design >Ag Nanostructures on GaN (0001): Morphology Evolution Controlled by the Solid State Dewetting of Thin Films and Corresponding Optical Properties
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Ag Nanostructures on GaN (0001): Morphology Evolution Controlled by the Solid State Dewetting of Thin Films and Corresponding Optical Properties

机译：GaN（0001）上的Ag纳米结构：薄膜的固态去湿和相应的光学性能控制着形态演变

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摘要

Silver (Ag) nanostructures have demonstrated the feasibility of being utilized in various optoelectronic, catalytic, biomedical, and sensor devices due to their excellent surface plasmon resonance characteristics. The geometrical structure, spacing, and spatial arrangement of nanostructures are crucial for controlling the properties and device performance. Herein, we demonstrate the fabrication of various configurations of self-assembled Ag nanostructures on GaN (0001) by the systematic control of deposition thickness and annealing duration. The surface morphology evolution is thoroughly investigated, and the corresponding influence on optical properties is probed. The evolution of Ag nanostructures in response to thermal annealing is described based on the dewetting of thin films, Volmer Weber growth model, coalescence growth, and surface energy minimization mechanism. For the deposition amount variation between 1 and 100 nm, the Ag nanostructures show gradual morphological transitions such as small nanoparticles (NPs) to enlarged NPs between 1 and 7 nm, elongated nanostructures to cluster networks between 10 and 30 nm, and void evolution with layered nanostructures between 40 and 100 nm. In addition, the annealing duration effect has been studied between 0 and 3600 s, where the Ag nanostructures exhibit the evolution of network like, elongated and isolated irregular shapes, ascribed to Ostwald's ripening along with Ag sublimation. Furthermore, corresponding Raman, photoluminescence, and reflectance spectra reveal the morphology-dependent behaviors and are discussed based on the phonon, emission band, scattering, absorption, and surface plasmon effect.
机译：银（Ag）纳米结构由于其出色的表面等离子体共振特性，已证明可用于各种光电，催化，生物医学和传感器设备。纳米结构的几何结构，间距和空间排列对于控制特性和器件性能至关重要。在本文中，我们通过沉积厚度和退火时间的系统控制，展示了在GaN（0001）上各种自组装Ag纳米结构的构造。彻底研究了表面形态演变，并探究了其对光学性能的影响。基于薄膜的去湿，Volmer Weber生长模型，聚结生长和表面能最小化机理，描述了响应于热退火的Ag纳米结构的演变。对于1到100 nm之间的沉积量变化，Ag纳米结构表现出逐渐的形态学转变，例如小纳米颗粒（NPs）到1到7 nm之间的扩大的NPs，拉长的纳米结构到10到30 nm之间的簇状网络以及层状空隙演化40至100 nm之间的纳米结构。此外，研究了退火持续时间在0到3600 s之间，其中Ag纳米结构表现出网络状的演化，如细长和孤立的不规则形状，归因于Ostwald随着Ag的升华而成熟。此外，相应的拉曼光谱，光致发光光谱和反射光谱揭示了形态学相关的行为，并基于声子，发射带，散射，吸收和表面等离子体激元效应进行了讨论。

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