Abstract
Highly luminescent carbon dots (C-dots) were synthesized by the one-pot simple hydrothermal method directly from lemon juice using different temperatures, time, aging of precursors, and diluted solvents to control the luminescence of C‐dots. The obtained C-dots were characterized by high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectrophotometry, dynamic light scattering, ultraviolet-visible spectrophotometry, and photoluminescent spectrophotometry. The results show that C‐dots had strong green light emission with quantum yield in the range of 14.86 to 24.89% as a function of hydrothermal temperatures. Furthermore, light emission that is dependent on hydrothermal time, aging of precursor, and diluted solvent was observed. These results suggest that the C‐dots have potential application in optoelectronics and bioimaging.
Highlights
Carbon quantum dots (C-dots) have received considerable attention in bioimaging because of their highly biocompatibility, luminescent properties, and sphere-shaped nanoparticles [1, 2]
We investigated the effect of hydrothermal temperature on the green luminescence of the C-dots under relatively long wavelength of excitation (420 nm)
To the best of our knowledge, this is the first time the effect of hydrothermal time and type of precursor to the luminescence of C-dots prepared from lemon juices are studied, which would build up more scientific information about C-dots field for designing strong and stable light emission in bioimaging and nanomedicine. e microstructure of the C-dots was Journal of Nanotechnology
Summary
Carbon quantum dots (C-dots) have received considerable attention in bioimaging because of their highly biocompatibility, luminescent properties, and sphere-shaped nanoparticles [1, 2]. C-dots derived from apple juice emit a wavelength of 428 nm with a quantum yield of 6.4% under the excitation of ultraviolet light of 340 nm [5]. C-dots derived from Acacia concinna seeds exhibiting strong emission at 468 nm when excited at 390 nm with a quantum yield of 10.2% were reported [8]. We report the effect of hydrothermal time, diluting solvents, type of precursor and excitation wavelength to the luminescence of C-dots. To the best of our knowledge, this is the first time the effect of hydrothermal time and type of precursor to the luminescence of C-dots prepared from lemon juices are studied, which would build up more scientific information about C-dots field for designing strong and stable light emission in bioimaging and nanomedicine. To the best of our knowledge, this is the first time the effect of hydrothermal time and type of precursor to the luminescence of C-dots prepared from lemon juices are studied, which would build up more scientific information about C-dots field for designing strong and stable light emission in bioimaging and nanomedicine. e microstructure of the C-dots was Journal of Nanotechnology
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