화학공학소재연구정보센터
Materials Chemistry and Physics, Vol.220, 111-117, 2018
Optimization of copper nanoparticles synthesized by pulsed laser ablation in distilled water as a viable SERS substrate for karanjin
A comprehensive study on the factors affecting the surface enhanced Raman scattering capability of copper nanoparticles for furanoflavonoid, karanjin is reported. The copper nanoparticles have been synthesized by pulsed laser ablation of a copper target immersed in distilled water. An interesting trend of increase followed by a decrease in the Raman enhancement with the decrease in concentration of copper nanoparticles is observed. This variation is attributed to the count of number of nanoparticles present around karanjin. The optimum concentration of copper nanoparticles for maximum SERS intensity of nanoparticle treated karanjin is found to be approximately 0.291 mg/mL. This optimum concentration corresponds to the sample having an average particle size of similar to 11 nm. There is a fall in the enhancement for smaller nanoparticles of average size similar to 7 nm as well as larger nanoparticles of similar to 20 nm. The observations have been explained on the basis of the electromagnetic enhancement due to the localized surface plasmons of the copper nanoparticles. The role of aggregation amongst the nanoparticles and also the degree of oxidation of the nanoparticles in controlling the SERS intensity is discussed.