Assemblies Of Silver Triangle Nanoprism Monolayers And Primary Study On Their Properties Of Surface-enhanced Raman Scattering

Anisotropic nanoparticles of gold and silver (such as rods, prisms, core-shell nanoparticles, et al.) have been the subjects for fundamental interests and practical applications, particularly the applications in surface-enhanced Raman scattering(SERS),due to that their optical properties are strongly dependent on the size, shape and environment of the particles. Recently, these methods have been used to inspect the signs of single molecule.Silver triangle nanoprisms have attracted great interests because of their unique optical properties. However, there is some limitation for their applications because they are very sensitive to the environment, such as the environmental changes can strongly influence their shape and optical properties. In our work, PVP (Poly (vinypyrrolidone))-stablized silver triangle nanoprisms can be assemblied onto amino-functionalized planar based on electrostatic attraction. And the sensitivity to pH, thermal stability and application in SERS of the obtained silver triangle nanoprism monolayer has been investigated. The good SERS active substrates are of great significance in understanding the SERS enhancement mechanism and in the fabrication of nanoparticle film for biosensing. Furthermore, the assembling method can be extended to self-assembly of PVP-coated Au nanorods and AucoreAgshell nanorods on the amino-functionalized planar and spherical surfaces based on electrostatic attraction, with adjustable optical response in the visible and the near infrared region(NIR) by varying the experimental parameters. Additionally, large-scale anisotropic metal nanoparticle monolayered films with subtle control over the surface coverage and tunable plasmon resonance as SERS substrates for probing p-aminothiophenol were investigated, which exhibited high SERS activity, stability and reproducibility.