Green Synthesis of Highly Luminescent Carbon Quantum Dots from Lemon Juice

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.

New Immunosensing-Fluorescence Detection of Tumor Marker Cytokeratin-19 Fragment (CYFRA 21-1) Via Carbon Quantum Dots/Zinc Oxide Nanocomposite

“…A difference between the previous two measurements was observed. Previous studies revealed that HRTEM does not show the crystal lattice structure of the formed CQDs at higher magnifications due to their amorphous nature [43]. Similarly, in this study, the natural precursor of carbon is Citrus lemon pericarp and the derived CQDs also exhibited amorphous nature.…”

Natural carbon-based quantum dots and their applications in drug delivery: A review

“…Kumar et al prepared orange juice-NCDs, which were high in quality and produced good yield [ 13 ]. Recently, lemon juice-NCDs were prepared and investigated by Hoan et al for potential applications in bioimaging and optoelectronics [ 14 ]. There are numerous other naturally occurring raw materials which have been employed for the preparation of NCDs such as carrot roots [ 15 ], egg yolk oil [ 16 ], chitosan [ 17 ] sucrose [ 18 ], raw cashew gum [ 19 ], lotus root [ 20 ], konjac flour [ 21 ],curcumin [ 22 ], mangosteen peel [ 23 ],N-acetyl- l -cysteine [ 24 ].…”

Resíduo de fruta cítrica como precursor de Carbon dots: um estudo de reprodutibilidade

“…[14] Esses grupos de superfície podem introduzir diferentes níveis de energia nos carbon dots e promover a fluorescência com diferentes comprimentos de onda de emissão (λem). As propriedades luminescentes dos carbon dots relativas aos defeitos de superfície, confinamento quântico, grau de oxidação e/ou mudança composicional são os mecanismos mais comuns associados a emissão de carbon dots derivados de limão [13][14][15][16][17]22]. Ding et al (2017) [14] relataram uma síntese de carbon dots com emissão no vermelho utilizando suco de limão na presença de diferentes quantidades de etanol.…”

“…Adicionalmente, o efeito de confinamento quântico foi descartado, uma vez que os tamanhos dos carbon dots permaneciam praticamente inalterados frente as modificações composicionais. Entretanto, no trabalho reportado por Hoan et al (2019) [22], a emissão com deslocamento para o vermelho e dependente do λexc foi atribuída ao efeito de confinamento quântico. Neste caso, as nanopartículas aumentavam de tamanho mediante o aumento da temperatura de síntese, e exibiam emissão em comprimento de onda mais longos.…”