Gold sputtered Blu-Ray disks as novel and cost effective sensors for surface enhanced Raman spectroscopy
Gold sputtered Blu-Ray disks as novel and cost effective sensors for surface enhanced Raman spectroscopy
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DOI：
10.1117/12.2078638
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
M. Nieuwoudt;Jacob W. Martin;R. Oosterbeek;N. Novikova;Xindi Wang;J. Malmström;David E. Williams;M. Simpson
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文献类型：
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作者：
M. Nieuwoudt;Jacob W. Martin;R. Oosterbeek;N. Novikova;Xindi Wang;J. Malmström;David E. Williams;M. Simpson
表面增强拉曼光谱(SERS)提供了对各种化合物的灵敏和非侵入性的检测，以及无与伦比的信息，以确定无机和有机化合物的分子身份，不仅在生物流体中，而且在所有其他水和非水介质中。通过SERS在聚集的金或银纳米颗粒的溶液/纳米结构界面上产生的局域热点使检测水平达到万亿分之几。先进制造方法的最新发展使具有可重复表面纳米结构的SERS衬底的制造成为可能，这种结构提供了可重复的定量分析，这在历史上是SERS技术的一个弱点。在本文中，我们描述了金溅射蓝光表面作为表面增强拉曼散射衬底的新用途。蓝光光盘为SERS衬底提供了理想的表面，它们具有可重复和规则的纳米光栅。我们发现，记录表面独特的表面特征和组成使得能够简单地通过金溅射形成具有纳米盖层的金纳米岛，并将这与水溶液中的三聚氰胺拉曼信号增加600倍和检测到68 ppb有关。三聚氰胺是一种三嗪类化合物，它不仅是环境地下水中的环境污染物，而且由于其含氮量高，也是食品中的掺杂物。我们使用金溅射蓝光光盘表面显示了三聚氰胺光谱的显著SERS信号增强，重复性为12%。蓝光光盘具有独特的设计、表面特征和记录表面成分的组合，这使它们成为通过金溅射涂层制备SERS基片的理想选择。
Surface Enhanced Raman spectroscopy (SERS) offers sensitive and non-invasive detection of a variety of compounds as well as unparalleled information for establishing the molecular identity of both inorganic and organic compounds, not only in biological fluids but in all other aqueous and non-aqueous media. The localized hotspots produced through SERS at the solution/nanostructure interface of clustered gold or silver nano-particles enables detection levels of parts per trillion. Recent developments in advanced fabrication methods have enabled the manufacture of SERS substrates with repeatable surface nanostructures which provide reproducible quantitative analysis, historically a weakness of the SERS technique. In this paper we describe the novel use of gold sputtered Blu-Ray surfaces as SERS substrates. Blu-Ray disks provide ideal surfaces of SERS substrates with their repeatable and regular nano-gratings. We show that the unique surface features and composition of the recording surface enables the formation of gold nano-islands with nanogaps, simply through gold sputtering, and relate this to a 600 fold signal increase of the melamine Raman signal in aqueous solutions and detection to 68 ppb. Melamine is a triazine compound and appears not only as environmental contaminant in environmental groundwater but also as an adulterant in foods due to its high nitrogen content. We have shown significant SERS signal enhancements for spectra of melamine using gold-sputtered Blu-Ray disk surfaces, with reproducibility of 12%. Blu-Ray disks have a unique combination of design, surface features and composition of the recording surface which makes them ideal for preparation of SERS substrates by gold sputter-coating.