Enhancing hybrid metal-semiconductor systems beyond SERS with PIERS (photo-induced enhanced Raman scattering) for trace analyte detection
Enhancing hybrid metal-semiconductor systems beyond SERS with PIERS (photo-induced enhanced Raman scattering) for trace analyte detection
复制标题
DOI：
10.1117/12.2557517
复制
发表时间：
2020-04
期刊：
影响因子：
--
通讯作者：
D. Glass;E. Cortes;W. Peveler;C. Howle;R. Quesada-Cabrera;I. Parkin;S. Maier
中科院分区：
文献类型：
--
作者：
D. Glass;E. Cortes;W. Peveler;C. Howle;R. Quesada-Cabrera;I. Parkin;S. Maier
混合金属-半导体系统是场拉曼分析的有前途的衬底，由于它们能够使用电磁和化学增强途径的表面增强拉曼光谱（Sers）。光诱导拉曼光谱（PIERS）是一种利用光诱导金属氧化物半导体表面氧空位来增强光催化活性的新方法。光致空位可以与分析物分子形成电子振动耦合共振，称为电荷转移，从而增强信号超过常规Sers增强。然而，最常用于激发PIERS衬底的常规UV源与用于现场分析的便携式拉曼系统组合是不切实际的。在这项工作中，我们展示了一个小的UVC LED，中心在255 nm，可以复制相同的结果，以前报道的好处，允许更大的原位真实的时间测量恒定的紫外线照射下。UV LED光源可以更容易和安全地控制，使其成为现场PIERS分析的实用UV光源。
Hybrid metal-semiconductor systems are promising substrates for field Raman analysis due to their ability to use both electromagnetic and chemical enhancement pathways for surface enhanced Raman spectroscopy (SERS). Photo-induced Raman spectroscopy (PIERS) has previously been shown to be a promising method utilizing an additional enhancement route through photo-inducing atomic surface oxygen vacancies in photocatalytic metal-oxide semiconductors. The photoinduced vacancies can form vibronic coupling resonances, known as charge transfers, with analyte molecules, enhancing the signal beyond conventional SERS enhancements. However, conventional UV sources most often used for excitation of the PIERS substrate are impractical in combination with portable Raman systems for field analysis. In this work we show how a small UVC LED, centered at 255 nm, can replicate the same results previously reported with the benefit of allowing greater in-situ real time measurements under constant UV exposure. The UV LED source can be controlled more easily and safely, making it a practical UV source for field PIERS analysis.