Using Particle Lithography to Tailor the Architecture of Au Nanoparticle Plasmonic Nanoring Arrays.
Using Particle Lithography to Tailor the Architecture of Au Nanoparticle Plasmonic Nanoring Arrays.
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DOI：
10.1021/acs.jpcb.7b06357
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
Arika Pravitasari;Maelani Negrito;K. Light;Wei-Shun Chang;S. Link;M. Sheldon;J. Batteas
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文献类型：
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作者：
Arika Pravitasari;Maelani Negrito;K. Light;Wei-Shun Chang;S. Link;M. Sheldon;J. Batteas
金属纳米结构阵列的简易组装是设计等离子体增强化学传感和太阳能电池结构的基本步骤。在这里，我们研究了使用颗粒光刻技术在亲水聚合物表面上创建由20纳米金纳米颗粒（NPs）组成的二维周期性阵列的控制形成的方法。为了指导组装过程，毛细力和NP浓度在最终的纳米结构阵列中都起着关键作用。因此，调整这些实验参数可以直接用于修改所形成的纳米结构的性质。为了探索这一点，将两种不同浓度的Au NP溶液（~ 7 × 1011或4 × 1012 NPs/mL）与固定浓度的聚苯乙烯微球（PS MS, ~ 6 × 109 PS MS/mL）结合使用。在相对湿度（RH）为45%和较高浓度的条件下组装，形成了高度约为23 nm、直径为881 nm、间距为2.5 μm的清晰的金纳米片。在65%的相对湿度和较低的NPs浓度下组装，得到由孤立的单个Au NPs组成的Au纳米甜甜圈阵列。为了探索在定义良好的结构中耦合的程度，收集了暗场散射光谱，显示了一个宽的局部表面等离子体共振（LSPR）峰，并带有一个肩，全波电动力学建模（时域有限差分（FDTD）方法）将其归因于纳米环阵列圆周上明显的粒子-粒子耦合。
The facile assembly of metal nanostructured arrays is a fundamental step in the design of plasmon enhanced chemical sensing and solar cell architectures. Here we have investigated methods of creating controlled formations of two-dimensional periodic arrays comprised of 20 nm Au nanoparticles (NPs) on a hydrophilic polymer surface using particle lithography. To direct the assembly process, capillary force and NP concentration both play critical roles on the resulting nanostructured arrays. As such, tuning these experimental parameters can directly be used to modify the nature of the nanostructures formed. To explore this, two different concentrations of Au NP solutions (∼7 × 1011 or 4 × 1012 NPs/mL) were used in conjunction with a fixed concentration of polystyrene microspheres (PS MS, ∼6 × 109 PS MS/mL). Assembly at a relative humidity (RH) of 45% with the higher concentration resulted in the formation of well-defined Au nanorings of ca. 23 nm in height and 881 nm in diameter with a pitch of 2.5 μm. Assembly at 65% RH with the lower concentration of NPs resulted in Au nanodonut arrays comprised of isolated single Au NPs. To explore the extent of coupling in the well-defined structures, dark field scattering spectra were collected and showed a broad localized surface plasmon resonance (LSPR) peak with a shoulder, which full-wave electrodynamics modeling (finite-difference time domain (FDTD) method) attributed to be a result of pronounced particle-particle coupling along the circumference of the nanoring array.