金纳米粒子修饰的硅纳米线结构中染料分子的表面增强拉曼散射。

Surface-Enhanced Raman Scattering from Dye Molecules in Silicon Nanowire Structures Decorated by Gold Nanoparticles.

机构信息

Faculty of Physics and Technology, Al-Farabi Kazakh National University, 71, Almaty 050040, Kazakhstan.

Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan.

出版信息

Int J Mol Sci. 2022 Feb 26;23(5):2590. doi: 10.3390/ijms23052590.

DOI:10.3390/ijms23052590

PMID:35269733

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8910339/

Abstract

Silicon nanowires (SiNWs) prepared by metal-assisted chemical etching of crystalline silicon wafers followed by deposition of plasmonic gold (Au) nanoparticles (NPs) were explored as templates for surface-enhanced Raman scattering (SERS) from probe molecules of Methylene blue and Rhodamine B. The filling factor by pores (porosity) of SiNW arrays was found to control the SERS efficiency, and the maximal enhancement was observed for the samples with porosity of 55%, which corresponded to dense arrays of SiNWs. The obtained results are discussed in terms of the electromagnetic enhancement of SERS related to the localized surface plasmon resonances in Au-NPs on SiNW's surfaces accompanied with light scattering in the SiNW arrays. The observed SERS effect combined with the high stability of Au-NPs, scalability, and relatively simple preparation method are promising for the application of SiNW:Au-NP hybrid nanostructures as templates in molecular sensorics.

摘要

采用金属辅助化学刻蚀法在单晶硅片上制备硅纳米线（SiNWs），然后沉积等离子体金（Au）纳米颗粒（NPs），将其作为表面增强拉曼散射（SERS）的模板，用于探测亚甲蓝和罗丹明 B 分子。发现 SiNW 阵列的孔填充因子（孔隙率）可以控制 SERS 的效率，对于孔隙率为 55%的样品，观察到最大的增强，这对应于 SiNW 密集排列。基于 Au-NPs 表面局域表面等离子体共振的电磁增强以及 SiNW 阵列中的光散射，对获得的结果进行了讨论。观察到的 SERS 效应结合 Au-NPs 的高稳定性、可扩展性以及相对简单的制备方法，有望将 SiNW:Au-NP 杂化纳米结构作为分子传感器中的模板得到应用。