Highly sensitive sensing of glutathione based on FOrster resonance energy transfer between MoS2 donors and Rhodamine 6G acceptors and its insight
Abstract We report excitation dependent tunable emission property of MoS 2 quantum dots (QDs) which can be applicable for enhanced energy transfer applications. Spectral overlap of fluorescence spectra of the prepared MoS 2 QDs excited at different wavelengths with the absorption spectrum of Rhodamine 6G (R6G) shows the possibility of FOrster resonance energy transfer (FRET) phenomena between MoS 2 QDs and R6G. The calculated overlap integrals are found to be increased when the excitation wavelength is varied from 330 to 430 nm. Steady state and time resolved fluorescence measurements are carried out to study the FRET process between MoS 2 QDs and R6G experimentally. The results show that the energy is transferred from MoS 2 QDs (serve as a donor) to R6G (function as an acceptor). Enhancement in energy transfer efficiency and resonant energy transfer rate are found as a result of exciting at different wavelengths, which is attributed to the increased overlap integral as shown by the spectral overlap. The FRET between prepared MoS 2 QDs and R6G at 330 and 430 nm excitation is used for glutathione sensing application. Highlights We report excitation dependent FRET characteristic of MoS 2 quantum dot donor and Rhodamine 6G dye acceptor. The FRET between MoS 2 and R6G is studied extensively through steady state and time resolved fluorescence spectroscopy. We found enhanced energy transfer due to increased spectral overlap integral as a result of tuning the excitation wavelength. This study provides a new way for white light FRET technology and no requirement of monochromator source for exciting the donor. We demonstrated the glutathione sensing application of MoS 2 -R6G couple at 330 and 430 nm excitation wavelengths.
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