Concentration quenching in cerium oxide dispersions via a Förster resonance energy transfer mechanism facilitates the identification of fatty acids†
Abstract
The energy exchange phenomena of cerium oxide based nanoparticles in a medium have been studied by means of a meticulous approach. A concentration dependent non-radiative pathway has been revealed for the particles due to the close proximity between them which causes the extinction of fluorescence. The calibration plot, according to the Stern–Volmer equation, showed a good linear relationship within the acceptable error limit, and the value of Q, denoting the exchange interaction, was close to 6, implying dipolar coupling between particles. Theoretical analysis of spectroscopic data showed that Förster resonance energy transfer (FRET) is the dominant mechanism responsible for the interparticle excitation transfer and the Förster radius (R0) calculated was 68.6 A°. The distance dependence of FRET has been utilized to analyse the conformation and chain length of fatty acids by interrupting the energy transfer efficiency among the particles, and thus a simple analytical tool based on FRET for the qualitative as well as quantitative assessment of fatty acids has been projected.
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