Collective and individual plasmon resonances in nanoparticle films obtained by spin-assisted layer-by-layer assembly
Collective and individual plasmon resonances in nanoparticle films obtained by spin-assisted layer-by-layer assembly
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DOI：
10.1021/la0355085
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发表时间：
2004-02-03
期刊：
影响因子：
3.9
通讯作者：
Tsukruk, VV
中科院分区：
文献类型：
--
作者：
Jiang, CY;Markutsya, S;Tsukruk, VV
利用自旋组装或自旋辅助层层沉积技术制备了含金纳米颗粒的纳米尺度均匀薄膜和多层金属纳米结构。这些具有通式[Au/（PAH-PSS）（n）PAH]（m）的SA-LbL膜在大尺度（数十微米宽）下具有具有均匀表面形态和高表面质量的良好组织的微结构。在SA-LbL薄膜的紫外-可见消光光谱中发现了来自孤立纳米粒子和粒子间相互作用的等离子体共振峰。所有薄膜在510-550 nm区域显示出强的消光峰，这是由于单个金纳米颗粒的等离子体共振由于局部介电环境而红移。对于在层内具有足够密度的金纳米颗粒的膜，在620和660 nm之间始终观察到第二个强峰，这是来自层内颗粒间耦合的集体等离子体共振。最后，我们建议，对于某些薄膜设计，层间粒子间共振可能会显示为一个独立的贡献，在800 nm的紫外-可见光谱。独立的和并发的个人，层内和层间等离子体共振的观察可以是关键的传感应用，其中涉及监测的光学活性的顺应性膜的光学机械性能。
Nanoscale uniform films containing gold nanoparticle and polyelectrolyte multilayer structures were fabricated by the using spin-assembly or spin-assisted layer-by-layer (SA-LbL) deposition technique. These SA-LbL films with a general formula [Au/(PAH-PSS)(n)PAH](m) possessed a well-organized microstructure with uniform surface morphology and high surface quality at a large scale (tens of micrometers across). Plasmon resonance peaks from isolated nanoparticles and interparticle interactions were revealed in the UV-visible extinction spectra of the SA-LbL films. All films showed the strong extinction peak in the region of 510-550 nm, which is due to the plasmon resonance of the individual gold nanoparticles red-shifted because of a local dielectric environment. For films with sufficient density of gold nanoparticles within the layers, the second strong peak was consistently observed between 620 and 660 nm, which is the collective plasmon resonance from intralayer interparticle coupling. Finally, we suggested that, for certain film designs, interlayer interparticle resonance might be revealed as an independent contribution at 800 nm in UV-visible spectra. The observation of independent and concurrent individual, intralayer, and interlayer plasmon resonances can be critical for sensing applications, which involve monitoring of optomechanical properties of ultrathin optically active compliant membranes.