Akinoglu Goekalp Engin, Mir Sajjad Husain, Gatensby Riley, Rydzek Gaulthier, Mokarian-Tabari Parvaneh
Advanced Materials and BioEngineering Research Centre (AMBER), Trinity College Dublin, The University of Dublin, Dublin 2, Ireland.
The School of Chemistry, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland.
ACS Appl Mater Interfaces. 2020 May 20;12(20):23410-23416. doi: 10.1021/acsami.0c03300. Epub 2020 May 6.
A surface-enhanced Raman spectroscopy sensing template consisting of gold-covered nanopillars is developed. The plasmonic slab consists of a perforated gold film at the base of the nanopillars and a Babinet complementary dot array on top of the pillars. The nanopillars were fabricated by the incorporation of an iron salt precursor into a self-assembled block copolymer thin film and subsequent reactive ion etching. The preparation is easy, scalable, and cost-effective. We report on the increase in surface-enhanced Raman scattering efficiency for smaller pillar heights and stronger coupling between the dot array and perforated gold film with average enhancement factors as high as 10. In addition, the block copolymer-derived templates show an excellent relative standard deviation of 8% in the measurement of the Raman intensity. Finite difference time domain simulations were performed to investigate the nature of the electromagnetic near-field enhancement and to identify plasmonic hot spots.
开发了一种由金覆盖的纳米柱组成的表面增强拉曼光谱传感模板。等离子体平板由纳米柱底部的穿孔金膜和柱顶部的巴比涅互补点阵列组成。通过将铁盐前驱体掺入自组装嵌段共聚物薄膜并随后进行反应离子蚀刻来制造纳米柱。该制备方法简便、可扩展且具有成本效益。我们报道了对于较小的柱高度，表面增强拉曼散射效率的提高，以及点阵列与穿孔金膜之间更强的耦合，平均增强因子高达10。此外，源自嵌段共聚物的模板在拉曼强度测量中显示出8%的出色相对标准偏差。进行了时域有限差分模拟以研究电磁近场增强的性质并识别等离子体热点。
