Photoinduced Electron Transfer in Carbon Dots with Long-Wavelength Photoluminescence

Mintz, Keenan J.; Guerrero, Brenda; Leblanc, Roger M.

doi:10.1021/acs.jpcc.8b06868

Cited by 55 publications

(27 citation statements)

References 63 publications

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“…As is known the UV/vis spectra of typical CDs have two typical absorption peaks at around 250 and 350 nm, which could be assigned to π-π* and n-π* transitions of C=C and C=O, respectively, in the core of CDs. 158,159 As discussed previously, the PL of CDs is usually believed to originate from the radiative recombination of excitons in core (carbon-core states) and surface electronic states, molecular states, surface functional groups and surface energy traps. Among them molecular states and carbon-core states were demonstrated for the first time by Giannelis and coworkers 160 in CDs prepared from citric acid and ethanolamine, and the radiative recombination of excitons in the surface states are more tunable.…”

Section: Developments In Elucidation Of Carbon Dots' Core Structurementioning

confidence: 99%

Recent development of carbon quantum dots regarding their optical properties, photoluminescence mechanism, and core structure

2019

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Section: Developments In Elucidation Of Carbon Dots' Core Structurementioning

confidence: 99%

Recent development of carbon quantum dots regarding their optical properties, photoluminescence mechanism, and core structure

2019

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“…For instance, Zhao et al used benzenetetramine to prepare CDs with emission wavelength above 600 nm. 19 A variety of precursors have been used to synthesize CDs hydrothermally or solvothermally, such as carbohydrates, 20 proteins, 21,22 and many organic acids including amino acids and citric acids. [23][24][25][26] Meanwhile, ultrasonication represents a gentler method compared with microwave irradiation or hydrothermal/solvothermal approaches, although examples of this technique are rare.…”

Section: Carbon Dotsmentioning

confidence: 99%

Carbon Dots: A Future Blood–Brain Barrier Penetrating Nanomedicine and Drug Nanocarrier

Zhang

Sigdel

Mintz

et al. 2021

IJN

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Drug delivery across the blood–brain barrier (BBB) is one of the biggest challenges in modern medicine due to the BBB’s highly semipermeable property that limits most therapeutic agents of brain diseases to enter the central nervous system (CNS). In recent years, nanoparticles, especially carbon dots (CDs), exhibit many unprecedented applications for drug delivery. Several types of CDs and CD-ligand conjugates have been reported successfully penetrating the BBB, which shows a promising progress in the application of CD-based drug delivery system (DDS) for the treatment of CNS diseases. In this review, our discussion of CDs includes their classification, preparations, structures, properties, and applications for the treatment of neurodegenerative diseases, especially Alzheimer’s disease (AD) and brain tumor. Moreover, abundant functional groups on the surface, especially amine and carboxyl groups, allow CDs to conjugate with diverse drugs as versatile drug nanocarriers. In addition, structure of the BBB is briefly described, and mechanisms for transporting various molecules across the BBB and other biological barriers are elucidated. Most importantly, recent developments in drug delivery with CDs as BBB-penetrating nanodrugs and drug nanocarriers to target CNS diseases especially Alzheimer’s disease and brain tumor are summarized. Eventually, future prospects of the CD-based DDS are discussed in combination with the development of artificial intelligence and nanorobots.

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“…Metal ion-dependent PL quenching of CDs has become a known phenomenon. In a report, the quenching mechanism has been identified as the photoinduced transfer of electrons from amine functional groups of the CDs to the respective metal ions [ 80 ].…”

Section: Properties Of Cdsmentioning

confidence: 99%

Carbon Dots: An Emerging Smart Material for Analytical Applications

2021

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Carbon dots (CDs) are optically active carbon-based nanomaterials. These nanomaterials can change their light emission properties in response to various external stimuli such as pH, temperature, pressure, and light. The CD’s remarkable stimuli-responsive smart material properties have recently stimulated massive research interest for their exploitation to develop various sensor platforms. Herein, an effort has been made to review the major advances made on CDs, focusing mainly on its smart material attributes and linked applications. Since the CD’s material properties are largely linked to their synthesis approaches, various synthesis methods, including surface passivation and functionalization of CDs and the mechanisms reported so far in their photophysical properties, are also delineated in this review. Finally, the challenges of using CDs and the scope for their further improvement as an optical signal transducer to expand their application horizon for developing analytical platforms have been discussed.

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Photoinduced Electron Transfer in Carbon Dots with Long-Wavelength Photoluminescence

Cited by 55 publications

References 63 publications

Recent development of carbon quantum dots regarding their optical properties, photoluminescence mechanism, and core structure

Recent development of carbon quantum dots regarding their optical properties, photoluminescence mechanism, and core structure

Carbon Dots: A Future Blood–Brain Barrier Penetrating Nanomedicine and Drug Nanocarrier

Carbon Dots: An Emerging Smart Material for Analytical Applications

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