Facile synthesis of fluorescent graphene quantum dots from coffee grounds for bioimaging and sensing

Wang, Liang; Li, Weitao; Wu, Bin; Li, Zhen; Wang, Shilong; Liu, Yuan; Pan, Dengyu; Wu, Minghong

doi:10.1016/j.cej.2016.04.123

Cited by 239 publications

(146 citation statements)

References 61 publications

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“…A lattice spacing of 0.22 nm is observed in Figure b, corresponding to the lattice spacing of the graphene (1 0 0) crystal plane. These results indicate that CQDs are made up of graphitic sp 2 carbon clusters . A more detailed morphology of the CQDs was detected by AFM (Figure c, d), which indicated that the CQDs are dispersed uniformly with a height of 0.7–2.2 nm, equivalent to 1–5 graphene layers.…”

Section: Resultsmentioning

confidence: 99%

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

et al. 2019

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Sustainable, inexpensive, and environmentally friendly biomass waste can be exploited for large‐scale production of carbon nanomaterials. Here, alkali lignin was employed as a precursor to synthesize carbon quantum dots (CQDs) with bright green fluorescence through a simple one‐pot route. The prepared CQDs had a size of 1.5–3.5 nm, were water‐dispersible, and showed wonderful biocompatibility, in addition to their excellent photoluminescence and electrocatalysis properties. These high‐quality CQDs could be used in a wide range of applications such as metal‐ion detection, cell imaging, and electrocatalysis. The wide range of biomass lignin feedstocks provide a green, low‐cost, and viable strategy for producing high‐quality fluorescent CQDs and enable the conversion of biomass waste into high‐value products that promote sustainable development of the economy and human society.

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Section: Resultsmentioning

confidence: 99%

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

et al. 2019

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“…Among various nonlinear optical materials, ‘green' carbon source CDs have shown the maximum nonlinear optical properties. Recent articles have demonstrated CQD synthesis using many natural materials and with an option to re‐use natural waste . Orange waste peels are underused natural resources and it is still challenging to use these leftover residues effectively.…”

Section: Introductionmentioning

confidence: 99%

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

et al. 2019

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A facile and eco‐friendly hydrothermal method was used to prepare carbon quantum dots (CQDs) using orange waste peels. The synthesized CQDs were well dispersed and the average diameter was 2.9 ± 0.5 nm. Functional group identification of the CQDs was confirmed by Fourier transform infrared spectrum analysis. Fluorescence properties of the synthesized CQDs exhibited blue emission. The fluorescence quantum yield of the CQDs was around 11.37% at an excitation wavelength of 330 nm. The higher order nonlinear optical properties were examined using a Z‐scan technique and a continuous wave laser that was operated at a wavelength of 532 nm. Results demonstrated that the synthesis of CQDs can be considered as promising for optical switching devices, bio‐scanning, and bio‐imaging for optoelectronic applications.

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“…Graphene, as a class of two‐dimensional nanomaterials, has attracted extensive attention in various fields including nanoelectronic devices, transparent conductors, energy, and catalysis. Owing to their intrinsic physical and chemical properties, graphene, graphene derivatives, and various graphene‐based nanocomposites have also been widely explored in the area of biomedicine for application in sensing systems , bioimaging , drug delivery , gene delivery , different types of cancer therapies , and tissue engineering . Graphene oxide as a beneficial derivative of graphene has the highest surface area between all known nanomaterials for drug delivery purposes.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide‐l‐arginine nanogel: A pH‐sensitive fluorouracil nanocarrier

Malekimusavi

Ghaemi

Masoudi

et al. 2019

Biotech and App Biochem

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Nowadays, putting forward an accurate cancer therapy method with minimal side effects is an important topic of research. Nanostructures, for their ability in controlled and targeted drug release on specific cells, are critical materials in this field. In this study, a pH‐sensitive graphene oxide‐l‐arginine nanogel was synthesized to carry and release 5‐fluorouracil. Optimized conditions using statistical analysis, based on the maximum relative viscosity of nanogel, were evaluated: 5.489 for the concentration of l‐arginine and 2.404 for pH. The prepared nanogels were characterized using scanning electron microscope and transmission electron microscope images and Fourier‐transform infrared spectroscopic analysis. Cytotoxicity was assessed using the sulforhodamine B (SRB) assay on MCF‐7 breast cancer cells. The fluorouracil release was measured by the dialysis bag method, UV spectrophotometry, and fluorouracil calibration diagram. Results proved the successful controlled release of fluorouracil at pH 5.4 and the beneficial role of graphene‐oxide‐ l‐arginine‐ fluorouracil nanogel in eliminating cancer cells.

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Facile synthesis of fluorescent graphene quantum dots from coffee grounds for bioimaging and sensing

Cited by 239 publications

References 61 publications

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

Graphene oxide‐l‐arginine nanogel: A pH‐sensitive fluorouracil nanocarrier

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