Effect Of Temperature On The Surface-enhanced Raman Scattering

Surface-enhanced Raman scattering is the phenomenon of Raman scattering signal enhancement caused by plasmon resonance which occure between molecules absorbed on rough metal surface or the nanopartides and metal surface.SERS can greatly magnify the Raman signals of the adsorbed molecules 106 to 1014 times,Because the surface morphology and structure of the substrate determines the generation and intensity of Raman signals.In addition,the detect temperature is a key factor in the effect of Surface-enhanced Raman scattering.Gold and silver two metals which have SERS active were used as base materials to study affecting factors of Surface-enhanced Raman scattering.The Au nanoparticles(Au NPs)substrate was prepared by electrochemical self-assembly and chemical self-assembly of metal nanoparticles,and crystal violet(CV)was used as probe molecules to discuss the surface enhanced Raman scattering properties of these two substrates.Comparing the surface enhanced Raman scattering result of Au nanoparticles prepared by two different methods.It found that the surface roughness and morphology of the substrate and measuring temperature will affect the magnitude of SERS signal enhancement,especially after gold particles aggregation.Particle nodes which gathered at the edges and corners of gold particles aggregation can be regarded as some hot surface Plasmon.The intensity of electromagnetic field will be increased,it can make the signal of surface-enhanced Raman scattering get significantly enhanced.The enhancement factor of Au nanoparticles substrate prepared by self-assembly is adjustable,and the substrate showed great reproducibility.The Ag nanoparticles(Ag NPs)film for surface-enhanced Raman scattering(SERS)-based sensing was prepared by a new and facile method.The porous Ni foam was used as a template to generate high quality of Ag NPs by seed-mediated growth of metallic nanoparticles.The process of the preparation is very economic and environment-friendly.It also can achieve the recovery of the raw materials.We found that the growth time and the type of silver-plating solution are two crucial factors to determine the magnitude of SERS signal enhancement.Using rhodamine 6G(R6G)as probe molecules,the created Ag NPs substrate exhibited relatively high enhancement ability,well reproducibility and good stability.