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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Determination of growth regimes of Pt nanostructures on GaN (0001) based on the control of Pt thickness and annealing time: Morphological evolution of Pt nanostructures from the nanoparticles, nanoclusters to porous network
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Determination of growth regimes of Pt nanostructures on GaN (0001) based on the control of Pt thickness and annealing time: Morphological evolution of Pt nanostructures from the nanoparticles, nanoclusters to porous network

机译：基于PT厚度和退火时间控制GaN（0001）对GaN（0001）的生长制度：Pt纳米结构与纳米颗粒，纳米能量的形态学演化

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摘要

Pt nanostructures are applicable in various applications such as sensors, solar cells, light emitting devices and catalysis and only slight changes in their configuration, density and size can induce significant changes in their properties and thus the functionality in the related applications. In this paper, the systematical evolution of Pt nanostructures such as nanoparticles, nanoclusters and porous network on GaN (0001) is demonstrated by the systematic thermal annealing of Pt thin films based on the combinational effects such as thermal dewetting, Volmer-Weber growth model and coalescence growth. In particular, small dome-shaped self-assembled Pt nanoparticles with relatively smaller deposition amount (2 nm) and wiggly Pt nanoclusters between 3 and 5 nm are formed based on the Volmer-Weber growth model and the partial coalescence of Pt nanoparticles, respectively. Between 10 and 30 nm, the growth of Pt nanoclusters is observed and eventually with the increased Pt thickness range between 40 and 100 nm, nanoclusters gradually develop into the porous Pt network by connecting neighboring structures owing to the enhanced coalescence growth. Meanwhile, along with the annealing time variation between 0 and 3600 s, the rate of dewetting is increased and as a result, the evolution of densely packed to separated nanoclusters is formed. In addition, the optical properties of corresponding Pt nanostructures demonstrate that the photoluminescence and Raman intensity are reduced along with the evolution of the surface coverage of Pt nanostructures, whereas the average reflectance is significantly enhanced accordingly at the same time.
机译：Pt纳米结构适用于各种应用，例如传感器，太阳能电池，发光器件和催化，并且其配置的微小变化，密度和尺寸可以诱导其性质的显着变化，从而促进相关应用中的功能。在本文中，通过基于组合效应（如热脱模，Volmer-Weber Grows Model）和Ptmer-Weber生长模型及其诸如热脱模，Volmer-Weber生长模型及聚结生长。特别地，基于Volmer-Weber的生长模型和Pt纳米粒子的部分聚结，形成具有相对较小的沉积量（<2nm）和3至5nm之间的沉积量（<2nm）和Wiglypt纳米细胞的小圆顶形状的自组装Pt纳米颗粒。在10至30nm之间，观察到Pt纳米团簇的生长，最终通过40至100nm的增加的Pt厚度范围，纳米能器由于增强的聚结生长而通过连接相邻结构逐渐发展到多孔PT网络中。同时，随着0至3600秒的退火时间变化，脱模率增加，结果，形成密集包装至分离的纳米团簇的演变。另外，相应的Pt纳米结构的光学性质表明，光致发光和拉曼强度随着PT纳米结构的表面覆盖的演变而减小，而平均反射率同时显着增强。

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