Kang Guoguo, Matikainen Antti, Stenberg Petri, Färm Elina, Li Peng, Ritala Mikko, Vahimaa Pasi, Honkanen Seppo, Tan Xiaodi
†School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China.
‡Institute of Photonics, University of Eastern Finland (Joensuu Campus), P.O. Box 111, FI-80101Joensuu, Finland.
ACS Appl Mater Interfaces. 2015 Jun 3;7(21):11452-9. doi: 10.1021/acsami.5b02206. Epub 2015 May 19.
A variety of different gold and silver nanostructures have been proposed over the years as high sensitivity surface-enhanced Raman scattering (SERS) sensors. However, efficient use of SERS has been hindered by the difficulty of realizing SERS substrates that provide reproducible SERS response over the whole active area. Here, we show that atomic layer deposition (ALD) grown iridium can be used to produce highly reliable SERS substrates. The substrates are based on a periodic array of high aspect-ratio iridium coated nanopillars that feature efficient and symmetrically distributed hot spots within the interpillar gaps (gap width<10 nm). We show that the enhancement with the iridium based nanostructures is of significant magnitude and it equals the enhancement of silver based reference substrates. Most notably, we demonstrate that the ordered and well-defined plasmonic nanopillars offer a measurement-to-measurement variability of 5%, which paves the way for truly quantitative SERS measurements.
多年来，人们提出了各种不同的金和银纳米结构作为高灵敏度表面增强拉曼散射（SERS）传感器。然而，由于难以实现能在整个活性区域提供可重复SERS响应的SERS基底，SERS的有效应用受到了阻碍。在此，我们表明原子层沉积（ALD）生长的铱可用于制备高度可靠的SERS基底。这些基底基于高纵横比的铱涂层纳米柱的周期性阵列，其在柱间间隙（间隙宽度<10 nm）内具有高效且对称分布的热点。我们表明，基于铱的纳米结构的增强幅度很大，且与银基参考基底的增强效果相当。最值得注意的是，我们证明了有序且定义明确的等离子体纳米柱提供了5%的测量间变化率，这为真正的定量SERS测量铺平了道路。
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