Gel‐like Carbon Dots: Characterization and their Potential Applications

Zhou, Yiqun; Desserre, Alexandra; Sharma, Shiv K.; Li, Shanghao; Marksberry, M. Hensley; Chusuei, Charles C.; Blackwelder, Patricia

doi:10.1002/cphc.201700038

Cited by 52 publications

(67 citation statements)

References 45 publications

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“…28 UV-Vis absorption, fluorescence, FTIR and TEM were used to characterize these particles (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

“…To this end, a new type of C-dots (CD2) were prepared from citric acid and ethylenediamine through the bottom-up approach. 28 Such C-dots generally have very high quantum yield, and have been broadly studied and used in many applications. 38, 39 Besides these two C-dots, a third type of C-dots from glycerin (CD3) was also prepared to explore the bone-binding properties.…”

Section: Resultsmentioning

confidence: 99%

“…28 Briefly, a 50 ml, round-bottom flask with 5 ml ethylenediamine (EDA) was purged with argon for 5 min before it was heated with constant stirring. Citric acid (1 g) was quickly added when the temperature rose to 160 °C.…”

Section: Methodsmentioning

confidence: 99%

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Carbon dots: promising biomaterials for bone-specific imaging and drug delivery

et al. 2017

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Bone-related diseases and dysfunctions are heavy burdens on our increasingly aged society. One important strategy to relieve this problem is through early detection and treatment of bone-related diseases. Towards this goal, there has been constant interest in developing novel bone-specific materials for imaging and drug delivery. Currently, however, materials that have high affinity and specificity towards bone are very limited. Carbon dots (C-dots) synthesized from carbon nanopowder bind to calcified bones in vivo with high affinity and specificity. In this study we show that bone binding is highly unique to a specific type of C-dots, and that this binding is non-toxic. Significantly, C-dots derived from other raw materials did not show any bone binding properties. These differences are attributed to differences in surface chemistry of C-dots preparations, highlighting the heterogeneous nature of C-dots. Importantly, bone-binding by carbon nanopowder derived C-dots are not significantly altered by chemical functionalization of their surface. These unique properties indicate the potential applications of carbon nanopowder-derived C-dots as highly bone-specific bioimaging agents and drug carriers.

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“…28 UV-Vis absorption, fluorescence, FTIR and TEM were used to characterize these particles (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Carbon dots: promising biomaterials for bone-specific imaging and drug delivery

et al. 2017

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“…Herein, in this study, we report that, on the basis of a gel‐like material (GM) containing CDs, which was synthesized as in the previous literature, four photoluminescent CDs fractions have been obtained after a sequence of common laboratory purification and separation were performed. After characterization by UV/vis absorption and PL emission spectroscopy, two fractions (2 and 3) exhibited excitation wavelength‐independent PL property, among which fraction 2 owned a high QY value (55 %).…”

Section: Introductionmentioning

confidence: 99%

Photoluminescent Carbon Dots: A Mixture of Heterogeneous Fractions

et al. 2018

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Photoluminescent carbon dots (CDs) fractions have been isolated from a gel-like material (GM), which was synthesized using a convenient one-step solvothermal route. In terms of purification, size exclusion chromatography (SEC) and dialysis were compared with acetone wash, which revealed the advantage of acetone wash. The pre-purified GM with acetone wash (A-GM) was further isolated by the reversed-phase preparative thin layer chromatography (TLC) with acetonitrile-water mixture (7 : 3; v /v ) as the developing solvent. As a result, there were four photoluminescent bands on the TLC plate, which indicated the presence of four photoluminescent fractions. Detailed characterization measurements such as UV/Vis absorption, fluorescence emission, attenuated total reflection Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, zeta potential, dynamic light scattering, atomic force microscopy, and TEM measurements were performed on all fractions to analyze their heterogeneous optical, structural, electrical, and morphological properties. Considering the comprehensive analysis, all isolated fractions were CDs. In addition, excitation wavelength-independent CDs were obtained with a mean size of 2.5 nm and high quantum yield (55 %). Furthermore, the study demonstrates that the excitation wavelength-dependent photoluminescence of GM could result from the mixture of different surface states of each CD fraction rather than multiple surface states of uniform CDs nanoparticles.

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“…Up to now, several approaches have been developed for the synthesis of C‐dots, including chemical ablation , electrochemical carbonization , laser ablation , microwave irradiation and hydrothermal/solvothermal treatment . In this work, the nanoparticle synthesis has been performed by thermal decomposition of carbon precursors in hot coordinating solvents.…”

Section: Introductionmentioning

confidence: 99%

Optical and dielectric properties of PMMA (poly(methyl methacrylate))/carbon dots composites

et al. 2018

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The optical and the dielectric properties of an original nanocomposite based on the incorporation of carbon dots (C‐dots) in poly(methyl methacrylate) (PMMA) at several filler loading were studied. The optical characterization demonstrated the preservation of the excitation dependent intense emission of the C‐dots in the polymer, ascribed to the presence of organic fluorophores formed during the nanoparticle synthesis. The composite PMMA/C‐dots dielectric properties were investigated in the frequency range from 40 Hz to 1 MHz and over the temperature range from 200 to 400 K. The dielectric response was obtained using the complex permittivity or the modulus formalisms, depending on the concentration of filler in the polymer matrix. A relaxation phenomenon was induced by the incorporation of the C‐dots in the PMMA matrix. In addition, both the real and imaginary parts of the dielectric permittivity and electric modulus changed with the volume fraction of the C‐dots, suggesting that the presence of the fillers greatly affect the dielectric properties of the polymer matrix because of polarization phenomenon induced by the nanoparticles. POLYM. COMPOS., 40:E1312–E1319, 2019. © 2018 Society of Plastics Engineers

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Gel‐like Carbon Dots: Characterization and their Potential Applications

Cited by 52 publications

References 45 publications

Carbon dots: promising biomaterials for bone-specific imaging and drug delivery

Carbon dots: promising biomaterials for bone-specific imaging and drug delivery

Photoluminescent Carbon Dots: A Mixture of Heterogeneous Fractions

Optical and dielectric properties of PMMA (poly(methyl methacrylate))/carbon dots composites

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