Veröffentlichungen und Präsentationen

Surface enhance Raman spectroscopy (SERS) capacitates applications in chemical and biological sensing and detection. It provides highly-sensitive sensing tool able to detect even at single molecule level. Therefore, large-scale fabrication of SERS substrates becomes an increasing interest, especially for those with high sensitivity at near-infrared (NIR) spectrum. In this study, we propose a highly porous silica-gold core-shell network structure as a possible efficient NIR-active SERS substrate with high density nanogaps to induce strong field localization. This structure can be simply produced in large scale using ultrathin gold layer deposition on a fumes silica nanolayer template. The localized surface plasmon resonance (LSPR) properties of such structure were investigated numerically by solving Maxwell’s equation performed in COMSOL Multiphysics^® simulation software. The randomized geometry of gold-coated fumed silica was generated using an algorithm with code written in a built-in model method. The plasmonic resonance was observed through absorption spectrum as well as the localized electric filed in the SERS structure. It was found that the proposed plasmatic structures provide large SERS enhancement factor with high spatial density of hot spots, particularity at the nanogaps. Furthermore, the plasmon resonances of most geometry cases are broadband at NIR range.