Abstract
The interaction of a perylene DBPI dye [N,N-bis(2,5-di-tert-butylphenyl)-3,4:9,10-perylenebis(dicarboximide)] with aqueous colloidal gold nanoparticles (AuNPs) was studied using steady state fluorescence quenching measurements. The Stern-Volmer quenching rate constant (K-sv) was calculated as similar to 2.2 x 10(8) and similar to 1.072 x 10(9) M-1 in ethanol and ethylene glycol respectively. From fluorescence quenching data, the static quenching and energy transfer play a significant role in the fluorescence quenching of DBPI with AuNPs. The apparent association constant (K-app) was calculated as similar to 1.4 x 10(9) (EtOH)and similar to 3.7 x 10(9) M-1 (ethylene). Due to AuNPs interaction with DBPI, the average aggregated colloidal AuNPs size is increased from similar to 53.39 nm (before interaction) to similar to 94.12 nm (after interaction).