Rationally designed particle-in-aperture hybrid arrays as large-scale, highly reproducible SERS substrates,Journal of Materials Chemistry C

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Rationally designed particle-in-aperture hybrid arrays as large-scale, highly reproducible SERS substrates
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-10-12 00:00:00 , DOI: 10.1039/c7tc03527f
Shunsheng Ye _{1,

2,

3,

4,

5} , Hongyu Wang _{1,

2,

3,

4,

5} , Hailong Wang _{3,

4,

5,

6} , Lingxia Chang _{1,

2,

3,

4,

5} , Junhu Zhang _{1,

2,

3,

4,

5} , Bai Yang _{1,

2,

3,

4,

5}

Affiliation

A large-scale, uniform array of particle-in-aperture (PIA) hybrid architectures for highly reproducible surface-enhanced Raman spectroscopy (SERS) is rationally designed and prepared via electrostatic self-assembly of Au nanospheres and vertical deposition of Ag. By controlling the thickness of the Ag coating, polarization-independent ring-shaped hot spots with tunable width can be created around individual nanospheres, offering far higher Raman enhancements than a bare Au nanosphere array and a flat Ag film do. Three PIA substrates with different Ag thicknesses and an identical nanosphere diameter of 58 nm were investigated. Consequently, it is found that a 28 nm Ag coating enables the wavelength matching between the plasmonic coupling band and the laser line, leading to an enhancement factor of up to 4.5 × 10⁶. Meanwhile, remarkable reproducibility of SERS signals is realized by ruling out the impact of anomalous hot spots. To this end, three guidelines are meticulously followed, i.e. using monodisperse Au nanospheres, distributing nanoring cavities evenly onto the substrate, and decoupling adjacent nanoparticles by isolating them far away from each other. This work offers a reliable strategy to fabricate high-performance SERS substrates in a simple, cost-effective and scalable manner, paving the way for practical sensing applications, such as quantitative SERS measurements.

中文翻译：

合理设计孔径内混合颗粒阵列，作为大规模，高重现性的SERS底物

通过以下方法合理设计和制备了用于高可再现性的表面增强拉曼光谱（SERS）的大规模，均匀阵列的孔径混合（PIA）混合体系结构金纳米球的静电自组装和银的垂直沉积。通过控制Ag涂层的厚度，可以在单个纳米球周围创建具有可调宽度的偏振无关的环形热点，与裸金纳米球阵列和平坦的Ag膜相比，拉曼增强作用要高得多。研究了三种具有不同Ag厚度和相同纳米球直径58 nm的PIA基板。结果，发现28nm的Ag涂层使得等离子体耦合带和激光线之间的波长匹配成为可能，从而导致高达4.5×10 ⁶的增强因子。同时，通过排除异常热点的影响，实现了SERS信号的出色再现性。为此，我们严格遵循三项准则，即使用单分散的Au纳米球，将纳米环腔均匀地分布到基板上，并通过将相邻的纳米粒子彼此隔离开来使它们分离。这项工作为以简单，经济高效和可扩展的方式制造高性能SERS基板提供了可靠的策略，为诸如定量SERS测量等实际传感应用铺平了道路。

更新日期：2017-11-16

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