Michałowska Aleksandra, Kudelski Andrzej
Faculty of Chemistry, University of Warsaw, 1 Pasteur Str., 02-097 Warsaw, Poland.
Molecules. 2022 May 11;27(10):3081. doi: 10.3390/molecules27103081.
Nanostructures made of magnetic cores (from FeO) with attached silver plasmonic nanostructures were covered with a very thin layer of silica. The (FeO@Ag)@SiO magnetic-plasmonic nanomaterial can be manipulated using a magnetic field. For example, one can easily form homogeneous layers from this nanomaterial using a very simple procedure: deposition of a layer of a sol of such a nanostructure and evaporation of the solvent after placing the sample in a strong magnetic field. Due to the rapid magnetic immobilization of the magnetic-plasmonic nanomaterial on the investigated surface, no coffee-ring effect occurs during the evaporation of the solvent. In this contribution, we report the first example of a magnetic, silver-based plasmonic nanomaterial for shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS). Nanoresonators based on silver plasmonic nanostructures locally enhance the intensity of the exciting electromagnetic radiation in a significantly broader frequency range than the previously used magnetic SHINERS nanoresonators with gold plasmonic nanostructures. Example applications where the resulting nanomaterial was used for the SHINERS investigation of a monolayer of mercaptobenzoic acid chemisorbed on platinum, and for a standard SERS determination of dopamine, are also presented.
由带有附着银等离子体纳米结构的磁性核（来自FeO）制成的纳米结构覆盖着一层非常薄的二氧化硅。(FeO@Ag)@SiO磁性等离子体纳米材料可以通过磁场进行操控。例如，使用非常简单的程序就可以轻松地用这种纳米材料形成均匀的层：沉积一层这种纳米结构的溶胶，然后将样品置于强磁场中后蒸发溶剂。由于磁性等离子体纳米材料在被研究表面上的快速磁性固定，在溶剂蒸发过程中不会出现咖啡环效应。在本论文中，我们报道了用于壳层隔离纳米粒子增强拉曼光谱（SHINERS）的磁性银基等离子体纳米材料的首个实例。基于银等离子体纳米结构的纳米谐振器在比先前使用的具有金等离子体纳米结构的磁性SHINERS纳米谐振器显著更宽的频率范围内局部增强激发电磁辐射的强度。还展示了所得纳米材料用于对化学吸附在铂上的巯基苯甲酸单层进行SHINERS研究以及用于多巴胺的标准表面增强拉曼光谱（SERS）测定的示例应用。
