A hierarchical heterostructure composed of silver nanoparticles (Ag-NPs: average diameter ∼10 nm) on fullerene nanorods (FNRs: average length ∼11 μm and average diameter ∼200 nm) was fabricated using a simple solution route. It was used as an effective single particle freestanding surface enhanced Raman scattering (SERS) substrate for the detection of target molecules (Rhodamine 6G: R6G). FNRs were formed ultra-rapidly (formation process completed in a few seconds) at a liquid–liquid interface of methanol and C₆₀/mesitylene solution then Ag-NPs were grown directly on the surfaces of the FNRs by treatment with a solution of silver nitrate in ethanol. This unique hierarchical heterostructure allows efficient adsorption of target molecules also acting as an effective SERS substrate capable of detecting the adsorbed R6G molecules in the nanomolar concentration range. In this study, SERS spectra are acquired on an isolated single Ag–FNR for the detection of the absorbed molecule rather than from a bulk, large area film composed of silver/gold nanoparticles as used in conventional methods. Thus, this work provides a new approach for the design and fabrication of freestanding SERS substrates for molecular detection applications.

中文翻译：

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Ag-纳米颗粒装饰的富勒烯纳米棒（Ag-FNRs）的分层异质结构是有效的单颗粒独立式SERS基质†

使用简单的溶液路线，在富勒烯纳米棒（FNR：平均长度〜11μm，平均直径〜200 nm）上制备了由银纳米颗粒（Ag-NP：平均直径〜10 nm）组成的分层异质结构。它用作有效的单颗粒独立式表面增强拉曼散射（SERS）底物，用于检测目标分子（若丹明6G：R6G）。FNR是在甲醇和C ₆₀的液-液界面上超快速形成的（形成过程在几秒钟内完成）。然后，通过用硝酸银的乙醇溶液处理，使Ag-NP直接在FNRs的表面上生长。这种独特的分层异质结构可以有效吸附目标分子，同时还可以作为有效的SERS底物，能够检测纳摩尔浓度范围内吸附的R6G分子。在这项研究中，SERS光谱是在孤立的单个Ag-FNR上获取的，用于检测吸收的分子，而不是像常规方法那样从大面积的大面积银/金纳米颗粒薄膜中获取SERS光谱。因此，这项工作为分子检测应用中独立式SERS底物的设计和制造提供了一种新方法。