Self-assembled silver nanoparticles: correlation between structural and surface plasmon resonance properties
Self-assembled silver nanoparticles: correlation between structural and surface plasmon resonance properties
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DOI：
10.1007/s00339-014-8546-5
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
Peng Mao;J. Chen;R. Xu;G. Xie;Yuanjian Liu;Guanghua Gao;Shan Wu
中科院分区：
文献类型：
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作者：
Peng Mao;J. Chen;R. Xu;G. Xie;Yuanjian Liu;Guanghua Gao;Shan Wu
报道了一种基于气相团簇束沉积的表面等离子体共振（SPR）频率可调的高密度银纳米粒子薄膜的可控制备方法。一方面，我们可以通过在二氧化硅衬底上沉积团簇来控制粒子的尺寸。消光光谱的自组装银纳米粒子具有不同的颗粒尺寸的特征，并显示两个SPR，其中SPR表现出红移从小于400 nm到大于570 nm的颗粒尺寸的增加，而另一个显示出轻微的位置偏移。另一方面，通过在涂有Formvar膜的石英玻璃上沉积团簇，可以控制自组装Ag纳米粒子的粒子间距，SPR波长从<400 nm红移到560 nm以上，这是由于与沉积物质近场耦合的近距离纳米粒子对的比例增加。的尺寸和覆盖率相关的SPR性能也比较从离散偶极子近似计算的结果。本发明的金属微结构的剪裁方法在等离子体激元学中可以找到重要的应用。
We report a facile method for controllable fabrication of high-density silver nanoparticle films with a widely adjustable surface plasmon resonance (SPR) frequency, based on the gas phase cluster beam deposition. On the one hand, we can control the particle size by depositing clusters on silica substrate. Light extinction spectra of the self-assembled Ag nanoparticles with various particle sizes are characterized and show two SPRs, in which a SPR exhibits a redshift from less 400 nm to more than 570 nm with an increase in the particle size, whereas the other shows a slight position shifting. On the other hand, the inter-particle distance of the self-assembled Ag nanoparticles can also be controlled by depositing clusters on silica glass coated with Formvar film, and the SPR wavelength shows a redshift from <400 nm to more than 560 nm, which can be attributed to the increase of the fraction of closely spaced nanoparticle pairs that are near-field coupled with the deposition mass. The size and coverage-dependent SPR properties are also compared with the results from the discrete dipole approximation calculations. The present method of tailoring metallic microstructures could find important applications in plasmonics.