Recent advances in Carbon Dots/2-D hybrid materials

Falara, Pinelopi P.; Zourou, Adamantia; Kordatos, Konstantinos

doi:10.1016/j.carbon.2022.04.029

Cited by 27 publications

(6 citation statements)

References 207 publications

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“…Materials with prolonged lifetime and stable room-temperature phosphorescence (RTP)/prominent afterglow have attracted a great deal of attention because of their multimodal applicabilities in photonics, optoelectronics, sensing, and catalytic devices. − However, accomplishing long-term afterglow at room temperature is a very challenging task due to the instability of excited triplet species, oxygen-induced phosphorescence quenching, and inefficient intersystem crossing (ISC). ,− In general, afterglow emissions have been mainly observed in some specific organic and inorganic materials, along with heavy metal-based organometallic complexes, and these materials are seriously suffering from some drawbacks, including heavy metal cytotoxicity, scarcity of their precursors, tedious or complicated synthesis procedures, and limited phosphorescence lifetimes to a range of several microseconds, which limits their practical applicability as long-term afterglow materials. ,,− Henceforth, metal-free sustainable materials with ultralong afterglow emissions offer potential alternatives. In this context, carbon dots (CDs) have gained significant interest because of their prominent features, including tunable photoluminescence (PL), high quantum yield, biocompatibility, ease of synthesis, low cost, excellent water solubility, good chemical stability, and low toxicity as compared with the other conventional fluorescent materials, and their substantial applications in various fields including optoelectronics, catalysis, anticounterfeiting and security devices, energy storage, biomedicines, etc. − ,− However, harvesting triplet state in CDs and generating room-temperature phosphorescence/long afterglow emission have not been explored much. In general, afterglow emission can only be generated by embedding CDs in a rigid matrix, where we can suppress the nonradiative deactivation processes. − , However, embedding CDs in a solid matrix limits their further applicability.…”

Section: Introductionmentioning

confidence: 99%

Stable Room-Temperature Phosphorescence from MXene-Derived Carbon Dots: Ultralong Afterglow Emission without an External Matrix

Kommula,

Sriramadasu,

Mandal

et al. 2024

ACS Appl. Opt. Mater.

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Herein, we synthesized highly defined carbon dots (CDs) from two-dimensional delaminated MXene through a solution-based acid etching method. The as-synthesized CDs show blue fluorescence emission in the solution phase upon neutralization with excess alkali. However, after solidification, the solid powder of CDs shows strong bright green room-temperature phosphorescence/afterglow emission for up to 5 s without using any further external matrix. The fundamental photophysical properties of the CDs are further correlated with the structural and elemental features. It suggests that the rigidity of the surface emissive states due to the slow modification of the exterior surface of CDs facilitates the afterglow emission. Temperature-dependent photoluminescence study and the systematic interconversion between room-temperature phosphorescence and prompt fluorescence depict the possible thermally activated delayed fluorescence at high temperatures. It is further correlated with the low-temperature phosphorescence studies (up to 90 K). The solid powder of CDs has been further utilized directly as a sustainable smart material for anticounterfeiting and information protection applications.

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Section: Introductionmentioning

confidence: 99%

Stable Room-Temperature Phosphorescence from MXene-Derived Carbon Dots: Ultralong Afterglow Emission without an External Matrix

Kommula,

Sriramadasu,

Mandal

et al. 2024

ACS Appl. Opt. Mater.

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“…The most interesting and promising representative from the carbon family are carbon nanodots (CDs), which have been known about since 2004 [1] and are being actively studied at present [2]. CDs demonstrate unique physicochemical characteristics, as they have a wide and adjustable photoluminescence (PL) band, they are biologically compatible, low toxic, and can also be used in various fields, from optoelectronics [3][4][5] and cryptography [6][7][8] to biomedicine [9,10].…”

Section: Introductionmentioning

confidence: 99%

Manganese-Doped Carbon Dots as a Promising Nanoprobe for Luminescent and Magnetic Resonance Imaging

Stepanidenko,

Vedernikova,

Badrieva

et al. 2023

Photonics

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Luminescent carbon nanodots (CDs) are a low-toxic nanomaterial with a tunable emission in a wide spectral range and with various functional groups on the surface. Therefore, CDs can prospectively serve as luminescent nanoprobes for biomedical applications, such as drug-delivery, visualization, sensing, etc. The doping of CDs with paramagnetic or transition metals allows the expansion of the range of applications of CDs and the fabrication of a multimodal nanoprobe for bioimaging. Here, we developed CDs doped with manganese (Mn) based on commonly used precursors—o-phenylenediamine or citric acid and formamide. The chemical structure, morphology, optical properties, and magnetic resonance responses have been carefully studied. The obtained CDs are up to 10 nm, with emissions observed in the 400–650 nm spectral region. CDs exhibit an ability to reduce both T1 and T2 relaxation times by up to 6.4% and 42.3%, respectively. The high relaxivity values suggest the use of CDs as promising dual-mode contrast agents for T1 and T2 MRI. Therefore, our developed CDs can be utilized as a new multifunctional nanoscale probe for photoluminescent and magnetic resonance bioimaging.

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“…[31][32][33] Recently, various studies have demonstrated the suitability of physically interacting CDs with some inorganic-based 2D materials, such as transition-metal carbides, [34] dichalcogenides, [35] and oxides, [36] to provide unique organicinorganic 0D/2D nanoarchitectonics with enhanced and even new physicochemical characteristics. [37][38][39] Further, calculation studies have shown the benefits of combining germanene and SiC layers to tune the electronic properties of Ge-based derivatives. [40] Consequently, engineering robust organic-inorganic 2D-Ge heterostructures employing covalent chemistry would be a fruitful path toward devising advanced 2D-Ge materials/ devices for task-specific applications.…”

Section: Introductionmentioning

confidence: 99%

Synthetic Nanoarchitectonics of Functional Organic–Inorganic 2D Germanane Heterostructures via Click Chemistry

et al. 2022

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counterparts, resulting in outstanding physicochemical characteristics.Concretely, germanene (the germanium analog of mainstream graphene) and its saturated forms-obtained by topochemical deintercalation of bulkier Ca 2 Ge into 2D germanane (2D-Ge) derivatives where each Ge atom is covalently bonded to a terminal ligand (e.g., H, CH 3 , or CH 2 CHCH 2 )-have recently attracted particular attention since they exhibit similar promising electronic features to graphene. [15][16][17] In addition, the fact that its bandgap can be easily modulated by tailoring the tethered terminal ligand has further stimulated interest in the synthesis of 2D-Ge derivatives, which present themselves as ideal candidates for a variety of (opto)electronic tasks, including bio-sensing, energy storage and conversion, catalysis, and beyond. [4,[18][19][20][21] Albeit being a very promising material, the vast majority of works involving 2D-Ge derivatives are mainly focused on either developing computational studies or discussing fundamental aspects, with minimum emphasis on their experimental implementation. [21,22] Consequently, there is enough room for realizing functional 2D-Ge-based materials/devices and their exploration for specific achievements.To date, the combination of organic and inorganic nanomaterials has led to the creation of unique heterostructuresreferred to as architectures composed of more than one Succeeding graphene, 2D inorganic materials made of reactive van der Waals layers, like 2D germanane (2D-Ge) derivatives, have attracted great attention because their physicochemical characteristics can be entirely tuned by modulating the nature of the surface substituent. Although very interesting from a scientific point of view, almost all the reported works involving 2D-Ge derivatives are focused on computational studies. Herein, a first prototype of organic-inorganic 2D-Ge heterostructure has been synthesized by covalently anchoring thiol-rich carbon dots (CD-SH) onto 2D allyl germanane (2D-aGe) via a simple and green "one-pot" click chemistry approach. Remarkably, the implanted characteristics of the carbon nanomaterial provide new physicochemical features to the resulting 0D/2D heterostructure, making possible its implementation in yet unexplored optoelectronic tasks-e.g., as a fluorescence resonance energy transfer (FRET) sensing system triggered by supramolecular π-π interactions-that are inaccessible for the pristine 2D-aGe counterpart. Consequently, this work builds a foundation toward the robust achievement of functional organic-inorganic 2D-Ge nanoarchitectonics through covalently assembling thiol-rich carbon nanoallotropes on commercially available 2D-aGe.

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Recent advances in Carbon Dots/2-D hybrid materials

Cited by 27 publications

References 207 publications

Stable Room-Temperature Phosphorescence from MXene-Derived Carbon Dots: Ultralong Afterglow Emission without an External Matrix

Stable Room-Temperature Phosphorescence from MXene-Derived Carbon Dots: Ultralong Afterglow Emission without an External Matrix

Manganese-Doped Carbon Dots as a Promising Nanoprobe for Luminescent and Magnetic Resonance Imaging

Synthetic Nanoarchitectonics of Functional Organic–Inorganic 2D Germanane Heterostructures via Click Chemistry

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