Synthesis and Optical Properties of DNA Modified Au-Au Nanosnowmen with ~1nm Nanogap

Abstract

To detect a wide variety of target materials, particularly biomaterials with high sensitivity, it is a very promising technology to use nanoprobes that emit strong optical signals. Most important in this detection method is the presence of nanoprobes that generate consistent strong optical signals, and therefore it is very important to synthesize these nanoprobes at high yields. Localized Surface Plasmon Resonance (LSPR), a typical property of metal nanoparticles, allows the metal nanoprobe to emit strongly amplified fluorescence or SERS signals. In particularly, when metal nanoprobes have nano-sized crevices or nano-sized gaps, plasmonic coupling occurs at very short distances. Thus, in Nanocrevice and Nanogap, the strength of the electromagnetic field is strongly amplified. When a substance that emits an optical signal located in a strongly amplified electric field, it emits a strongly amplified optical signal. This paper also discusses the optical properties of Au-Au nanosnowmen structures and discusses the stability of optical signals in a living environment that is required for future bioapplication.