Green Synthesis of Carbon Dots from Grapefruit and Its Fluorescence Enhancement

Abstract

In this study, undoped carbon quantum dots (UCQDs, UCQDs-peel) and N-doped carbon dots (NCQDs) were prepared by a facile one-pot environmentally friendly hydrothermal method using grapefruit as carbon sources in the absence and presence of area, respectively. The structure, morphology, and fluorescence properties of three samples were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and photoluminescence (PL). It was found that three types of CQDs could emit blue fluorescence with different intensities when irradiated with ultraviolet light. Compared to the luminescence properties of UCQDs, NCQDs, and UCQDs-peel, it can be seen that the fluorescence intensity of NCQDs was strongest due to the presence of NH and C-N bonds.

Design of Fluorescent Carbon Dots (CDs) for the Selective detection of Metal‐Containing Ions

“…These fluorescent nanoparticles (NPs) can be prepared from low-cost carbon sources using simple methods. [21][22][23][24][25][26][27][28] By tuning the precursors and reaction parameters, the functional groups at the surface of CDs may be precisely tuned, to offer functionalities such as amino hydroxyl, carboxyl, carbonyl, and other oxygenated groups which can stabilize the energy trap on the surface of the CDs and cause their fluorescence emission. [29][30][31][32] The available synthetic routes are eco-friendly, cost-effective, and may be brought easily to large-scale production.…”

Biyoteknolojik uygulamalar için limon suyundan karbon noktalarının mikrodalga bazlı sentezi

“…Carbon dots (CDs) have been used in many different applications such as biosensors, drug delivery, antimicrobial/antiviral/cancer therapies in medical biotechnology, since they are synthesized environmentally friendly and cheaply as well as they have very unique optical properties (Pramanik et al, 2018;Huo et al, 2020;Leong et al, 2020). Natural CDs are new alternatives and they can be obtained from natural sources such as fruits, flowers, eggs, fruit juice, carrot roots etc.…”

“…Natural CDs are new alternatives and they can be obtained from natural sources such as fruits, flowers, eggs, fruit juice, carrot roots etc. (Pramanik et al, 2018;Huo et al, 2020;Nair et al, 2020). For today, natural CDs have low fluorescence intensities, however studies to improve their fluorescence features have been going on (Huo et al, 2020).…”

“…(Pramanik et al, 2018;Huo et al, 2020;Nair et al, 2020). For today, natural CDs have low fluorescence intensities, however studies to improve their fluorescence features have been going on (Huo et al, 2020). For these purposes, studies have been focused on synthesis methods such as the use of different solvents or compounds, surface modifications, heteroatom addition etc.…”

“…For these purposes, studies have been focused on synthesis methods such as the use of different solvents or compounds, surface modifications, heteroatom addition etc. (Huo et al, 2020).…”