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Au nanoparticle monolayers: preparation, structural conversion and their surface-enhanced Raman scattering effects

机译：金纳米颗粒单层：制备，结构转化及其表面增强拉曼散射效应

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摘要

An environment-friendly method is developed to fabricate close-packed Au nanoparticle (AuNP) monolayers with sub-10 nm interparticle spacing simply by covering n-butanol on the surface of an Au aqueous colloid. The close-packed nanostructure can further transform into two-dimensional (2D) aggregates with different aggregation degrees upon aging for several days. This structural evolution process was disclosed by transition electron microscopy (TEM) and UV–vis spectroscopy and its influence on the ensemble optical properties was further demonstrated by surface-enhanced Raman scattering (SERS). It was revealed that creating sub-10 nm interparticle spacing and particle dimers are highly desirable for engendering strong SERS activity under a 632.8 nm excitation. Further aging the film leads to the formation of larger aggregates, which moves the surface plasmon resonance of the aggregates gradually ‘off-resonance’ from the 632.8 nm excitation line and costs some numbers of sub-10 nm interparticle spacings. The two parameters together decrease the SERS activity of the close-packed AuNP monolayers. The present strategy thus provides an easy way to finely tune the SERS properties of thin nanoparticle films and other ensemble properties, which can easily be realized by creating sub-10 interparticle spacing, controlling the particle aggregation degree and by adopting suitable particle sizes and shapes.
机译：通过开发一种环境友好的方法，只需将正丁醇覆盖在Au水性胶体的表面上，即可制造出颗粒间距小于10 nm的密排Au纳米颗粒（AuNP）单层膜。密堆积的纳米结构在老化数天后可以进一步转变为具有不同聚集度的二维（2D）聚集体。过渡电子显微镜（TEM）和紫外可见光谱揭示了这种结构演化过程，表面增强拉曼散射（SERS）进一步证明了其对整体光学性能的影响。揭示了产生亚10 nm的颗粒间间距和颗粒二聚体对于在632.8 nm激发下产生强烈的SERS活性是非常需要的。薄膜进一​​步老化会导致形成更大的聚集体，从而使聚集体的表面等离振子共振从632.8 nm激发线逐渐“偏离共振”，并花费了一些低于10 nm的粒子间间距。这两个参数共同降低了密排AuNP单层的SERS活性。因此，本发明的策略提供了一种微调纳米颗粒薄膜的SERS特性和其他整体特性的简便方法，这可以通过创建亚10粒子间间距，控制粒子聚集度以及采用合适的粒度和形状来轻松实现。

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