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首页> 外文期刊>RSC Advances >Physical process-aided fabrication of periodic Au–M (M = Ag, Cu, Ag–Cu) alloyed nanoparticle arrays with tunable localized surface plasmon resonance and diffraction peaks
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Physical process-aided fabrication of periodic Au–M (M = Ag, Cu, Ag–Cu) alloyed nanoparticle arrays with tunable localized surface plasmon resonance and diffraction peaks

机译：物理过程辅助的周期性Au-M（M = Ag，Cu，Ag-Cu）合金纳米粒子阵列的制备，该阵列具有可调的局部表面等离子体激元共振和衍射峰

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摘要

Periodic alloyed (Au–Ag, Au–Cu, Au–Ag–Cu) nanoparticle (NP) arrays with uniform size, controllable composition and center-to-center spacing were fabricated by a novel and facile strategy based on physical vapor deposition on a monolayer colloidal crystal template and further heat treatment. The composition and center-to-center spacing were manipulated by adjusting the sputtering target in the deposition process and the size of colloidal spheres of the template, respectively. The shadow effect and a dewetting model were employed to analyze the whole process of evolution from a metallic thin film to spherical nanoparticles with uniform size. The localized surface plasmon resonance (LSPR) and diffraction peaks of these alloyed arrays were systematically measured. The dielectric constant has an important influence on LSPR peaks and diffraction peaks. Both the LSPR and diffraction peaks of Au–Ag alloyed NPs arrays exhibit a blue shift due to their lower dielectric constant than that of pure Au NPs. However, compared with Au, Cu possesses a higher dielectric constant, leading to a red shift of the LSPR and diffraction peaks of Au–Cu alloyed NPs arrays. With the increase of NP size, the diffraction peaks of both binary alloyed NPs exhibit a slight red shift. Moreover, the LSPR absorption peaks were more sensitive to the composition of the NPs than the diffraction peaks. This work would open up a novel strategy in the production of alloyed NP arrays with tunable LSPR peaks and diffraction peaks, which would be very helpful to improve their practical applications in various fields.
机译：周期性合金化（Au–Ag，Au–Cu，Au–Ag–Cu）纳米颗粒（NP）阵列具有均匀的尺寸，可控的成分和中心到中心的间距，是基于一种新颖且简便的策略，基于物理气相沉积单层胶体晶体模板并进一步热处理。通过在沉积过程中调节溅射靶和模板的胶体球的大小分别控制组成和中心距。阴影效应和去湿模型被用来分析从金属薄膜到尺寸均匀的球形纳米粒子的整个演化过程。系统地测量了这些合金阵列的局部表面等离子体激元共振（LSPR）和衍射峰。介电常数对LSPR峰和衍射峰具有重要影响。 Au-Ag合金化NP阵列的LSPR和衍射峰均显示出蓝移，这是由于其介电常数低于纯Au NP的介电常数。但是，与Au相比，Cu具有较高的介电常数，导致LSPR发生红移和Au-Cu合金化NP阵列的衍射峰。随着NP尺寸的增加，两种二元合金NP的衍射峰均显示出轻微的红移。而且，LSPR吸收峰比衍射峰对NP的组成更敏感。这项工作将为生产具有可调LSPR峰和衍射峰的合金NP阵列开辟新策略，这将对改善其在各个领域的实际应用非常有帮助。

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