Role of Sputter Deposition Rate in Tailoring Nanogranular Gold Structures on Polymer Surfaces.
Role of Sputter Deposition Rate in Tailoring Nanogranular Gold Structures on Polymer Surfaces.
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DOI：
10.1021/acsami.6b15172
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发表时间：
2017-02
影响因子：
9.5
通讯作者：
M. Schwartzkopf;A. Hinz;O. Polonskyi;T. Strunskus;Franziska C. Löhrer;V. Körstgens;P. Müller‐Buschbaum;F. Faupel;S. Roth
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文献类型：
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作者：
M. Schwartzkopf;A. Hinz;O. Polonskyi;T. Strunskus;Franziska C. Löhrer;V. Körstgens;P. Müller‐Buschbaum;F. Faupel;S. Roth
通过自组装制备可重复、低成本的功能聚合物-金属界面在有机电子学和有机光伏领域具有重要意义。特别是，亚单层和纳米颗粒系统展示了非常有趣的电学、等离子体和催化性质。开发它们的巨大潜力需要在纳米级及以下的结构量身定做。为了完全控制聚合物-金属界面的复杂纳米结构的演变，我们用时间分辨的掠入射小角X射线原位散射技术监测了溅射沉积过程中金属层形貌的演变。我们确定了不同沉积速率对生长过程的影响：沉积速率主要影响成核过程和吸附介导的生长，而对扩散介导的生长过程的影响很小。只有在较高的速率下，由于随机成核的影响越来越大，初始颗粒密度才会更高，薄膜渗流发生得更早。对所获得的结果进行了讨论，以确定作为有效层厚度和沉积速率的函数的与各种应用相关的金团簇的最佳形态参数。我们的研究为改进定制的金属-聚合物纳米结构的制备开辟了新的机会，用于等离子体增强应用，如有机光伏和传感器。
The reproducible low-cost fabrication of functional polymer-metal interfaces via self-assembly is of crucial importance in organic electronics and organic photovoltaics. In particular, submonolayer and nanogranular systems expose highly interesting electrical, plasmonic, and catalytic properties. The exploitation of their great potential requires tailoring of the structure on the nanometer scale and below. To obtain full control over the complex nanostructural evolution at the polymer-metal interface, we monitor the evolution of the metallic layer morphology with in situ time-resolved grazing-incidence small-angle X-ray scattering during sputter deposition. We identify the impact of different deposition rates on the growth regimes: the deposition rate affects primarily the nucleation process and the adsorption-mediated growth, whereas rather small effects on diffusion-mediated growth processes are observed. Only at higher rates are initial particle densities higher due to an increasing influence of random nucleation, and an earlier onset of thin film percolation occurs. The obtained results are discussed to identify optimized morphological parameters of the gold cluster ensemble relevant for various applications as a function of the effective layer thickness and deposition rate. Our study opens up new opportunities to improve the fabrication of tailored metal-polymer nanostructures for plasmonic-enhanced applications such as organic photovoltaics and sensors.