1 School of Physics, College of Science, University of Tehran, Tehran, Iran.
2 Plasma Physics Research Center, Faculty of Science, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Appl Spectrosc. 2019 Aug;73(8):879-892. doi: 10.1177/0003702819841913. Epub 2019 May 20.
In this work, the surface engineering method is used to produce Mn helical star-shaped (pine-tree-like) nanosculptured thin films with three-, four-, and fivefold symmetries on Cu substrates using an oblique angle deposition technique together with rotation of the sample holder at certain angles. Nano structure and morphologies of the produced samples were obtained by means of atomic force microscope and field emission scanning electron microscope. Raman spectroscopy of the Mn/Cu samples impregnated by 4,4'-bipyridine (CHN) solution with different concentrations, zidovudine (CHNO), and L-histidine (CHNO) was performed using 532 nm laser wavelength. A high degree of enhancement is achieved on Raman spectroscopy of all of these specimens. Comparison of the surface-enhanced Raman spectroscopy (SERS) results for 4,4' bipyridine (bipy) obtained in this work with the published literature using Ag and Au substrates in different shapes showed a significant enhancement improvement by using Mn sculptured structures. Reduction of the bipy concentration changed the enhancement factor. Enhancement factors of 10 and 10 were obtained for threefold symmetry sample using 2.885 × 10 and 10mol L bipy concentrations, respectively. Surface-enhanced Raman spectroscopy results of this work show that Mn nanostructures designed and engineered in this work can not only replace Ag and Au materials, but also provide a much higher enhancement factor.
在这项工作中，使用表面工程方法在 Cu 衬底上使用斜角沉积技术和样品旋转器以一定角度旋转，生产出具有三、四和五重对称的 Mn 螺旋星状（松树状）纳米雕刻薄膜。使用原子力显微镜和场发射扫描电子显微镜获得了所生产样品的纳米结构和形貌。用不同浓度的 4,4'-联吡啶（CHN）溶液、齐多夫定（CHNO）和 L-组氨酸（CHNO）浸渍 Mn/Cu 样品后，进行了拉曼光谱分析，使用 532nm 激光波长。所有这些样品的拉曼光谱都实现了高度增强。与使用 Ag 和 Au 衬底在不同形状下的发表文献相比，本工作中使用 Mn 雕刻结构获得的 4,4'联吡啶（bipy）的表面增强拉曼光谱（SERS）结果表明，通过使用 Mn 雕刻结构显著提高了增强效果。降低 bipy 浓度会改变增强因子。使用 2.885×10 和 10mol L bipy 浓度，分别获得了三重对称样品的增强因子 10 和 10。本工作的表面增强拉曼光谱结果表明，本工作设计和工程化的 Mn 纳米结构不仅可以替代 Ag 和 Au 材料，而且还可以提供更高的增强因子。
