Abstract
The luminescent carbon quantum dots were synthesized by microplasma treatment of a glucose solution at atmospheric pressure at room temperature. The spectral and kinetic characteristics of synthesized quantum dots were studied by time-resolved confocal scanning luminescent microscopy and time-correlated single photon counting. The emission spectra are wide non-elementary bands. Their maxima were located at 476, 500, 547 and 580 nm at the wavelengths of the exciting radiation of 375, 405, 470 and 532 nm, respectively. Three exponential components with decay time constants of 0.65, 2.2, and 6.2 ns were detected in the luminescence kinetics. The presence of these components is due to the formation of three different types of luminescence centers at quantum dots with different probabilities of quantum transitions. Presumably, it may be related to the activation of quantum dots by various impurities or other defects formed luminescence centers. The concentration of quantum dots was controlled by changing the microplasma processing time of the glucose solution.
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