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Title: Surface embedded enhancement of fluorescence of coumarinyl-azo-imidazolium stabilized gold nanoparticles
Authors: Patra, Chiranjit
Roy, Himanish
Sen, Chandana
Mahapatra, Ambikesh
Sinha, Chittaranjan
Keywords: Nanoparticles;Gold nanoparticles;Fluorescence;Quantum yield;Coumarins;1, 3-Dialkyl-2-(coumarinyl-6-azo) imidazolium bromide
Issue Date: 19-Mar-2015
Abstract: Coumarinyl-azo-imidazole (CAI-H) undergoes double alkylation to yield 1, 3-dialkyl-2-(coumarinyl-6-azo)imidazolium bromide (CAI-(CnH2n+1)2+Br-) of long chain alkyl groups –CnH2n+1 (n = 6, 9, 12, 15, 18) attached to imidazolyl motif. These compounds are characterized by spectroscopic data (FT-IR, UV-vis and 1H NMR). The size of the gold nanoparticles stabilized with tetraoctylammonium bromide (avg size 20.5 nm) is reduced to 2–10 nm upon surface implantation of CAI-(CnH2n+1)2+; these have been characterized by FESEM/TEM. The spectroscopic investigation has established the stability of gold nanoparticles. The fluorescence emissivity of these nanoparticles is enhanced 10–25 folds as compared to free CAI-(CnH2n+1)2+Br, which may be due to coupling of plasmonic band with emission of fluorescent dye molecules and the reduction of PET (Coumarin*→ Imidazolium) and vibrational relaxation of imidazolium coating on the gold nanoparticles surface.
Page(s): 316-323
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.54A(03) [March 2015]

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