INTERACTION OF SURFACE PLASMON RESONANCE OF GOLD NANOSTRUCTURE AND NILE RED: PHOTOPHYSICAL STUDY OF METAL ENHANCE FLUORESCENCE OF WEAK FLUOROPHORE

Abstract

Gold nanorods can alter the photophysical properties, when a fluorescent probe present near the vicinity of nanomaterials as a certain distance. A spectroscopic investigation of nile red near the vicinity of nanorods has been implemented and proved that the metal enhances fluorescence with gold nanorods, formed with seed mediated method in which CTAB is used. Here we tuned the gold nanorods synthesis in which the CTAB bilayer surrounded the gold nanorods is act as a spacer and responsible to increase the distance between nanorods and nile red. The observed metal enhances fluorescence (MEF) resulting the drastic changes in the fluorescence intensity and life time of the nile red. This mechanism can be explained by the increasing the absorption cross section and excitation rate of dye due to the nanorods and the alteration in the radiative/nonradiative decay processes. This extreme increment in fluorescence of the weak fluorescent probe reveals the outstanding possibility for distinct improvement of fluorescence without introducing the extra spacer.