Surface-enhanced Raman scattering from copper nanoparticles treated furanoflavonoid karanjin

¹Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, India

²Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, India

³Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India

Adv. Mater. Lett., 2017, 8 (10), pp 971-976

DOI: 10.5185/amlett.2017.1612

Publication Date (Web): Jul 22, 2017

Copyright © IAAM-VBRI Press

E-mail: alika@iitg.ernet.in

Abstract

The effect of concentration of copper (Cu) nanoparticles (NPs) on surface enhanced Raman scattering (SERS) in furanoflavonoid karanjin is reported in this paper. Cu NPs were synthesized by pulsed laser ablation of Cu target immersed in distilled water (DW). The absorption spectrum of colloidal solution of Cu NPs displayed a broad peak around ~625 nm corresponding to the surface plasmon resonance (SPR) oscillations. Transmission electron microscope (TEM) images confirmed the formation of nearly spherical Cu NPs having average size of ~12-13 nm. The solution of furanoflavonoid karanjin dissolved in dimethyl sulphoxide (DMSO) was treated with the synthesized NPs and subjected to micro-Raman spectrophotometer for the SERS studies as a function of concentration of Cu NPs. Raman signal of Cu NP treated karanjin was observed to be ten times more as compared to that of untreated one for the most intense C=O stretching band of flavone ring. This corresponds to an enhancement factor of the order of 10² and was observed at the optimum concentration of ~0.08 mg/mL of Cu NPs.

Keywords

Surface enhanced raman scattering, copper nanoparticles, surface plasmon resonance, furanoflavonoid.