Current scenario and recent advancement of doped carbon dots: a short review scientocracy update (2013–2022)

Ghosh, Trisita; Das, Tushar Kanti; Das, Poushali; Banerji, P.; Das, Poushali

doi:10.1007/s42823-022-00339-5

Cited by 32 publications

(22 citation statements)

References 229 publications

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“…Because of the presence of NH 2 on the surface of the nitrogen-doped CQDs, the conjugation of the whole system increases and the 𝜋-𝜋* transition of the C=N bond is redshifted to 410 nm. [28,56] The 3D fluorescence mapping of the nitrogen-doped CQDs is shown in Fig- ure 1e. It is obvious that it is focused on a characteristic point, i.e., the maximum excitation wavelength is 420 nm and the maximum emission wavelength is 565 nm.…”

Section: Characterization Of the Structure And Fluorescence Propertie...mentioning

confidence: 99%

“…Finally, some of the carbon quantum dots are pH-dependent, and the ionization degree of the functional groups will change with the change of pH, which will cause the change of fluorescence intensity. [28,56,57]…”

Section: Characterization Of the Structure And Fluorescence Propertie...mentioning

confidence: 99%

“…[24][25][26][27] In order to broaden the application fields of CQDs, more and more researches choose to dope them with N, B, S, and P elements. [28] In particular, nitrogen-doped CQDs with reactive groups such as NH 2 on their surface will passivate the surface of CQDs, thus suppressing their excitation-dependent fluorescence properties and shifting the emission wavelength to the long wavelength direction. Meanwhile, the fluorescence intensity and fluorescence quantum yield of the nitrogen-doped CQDs are improved.…”

Section: Introductionmentioning

confidence: 99%

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Carbon Quantum Dot/Chitosan‐Derived Hydrogels with Photo‐stress‐pH Multiresponsiveness for Wearable Sensors

Wei

et al. 2023

Macromol. Rapid Commun.

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In recent years, hydrogels have attracted extensive attention in smart sensing owing to their biocompatibility and high elasticity. However, it is still a challenge to develop hydrogels with excellent multiple responsiveness for smart wearable sensors. In this paper, a facile synthesis of carbon quantum dots (CQDs)-doped cross-linked chitosan quaternary/carboxymethylcellulose hydrogels (CCCDs) is presented. Designing of dual network hydrogels decorated with CQDs provides abundant crosslinking and improves the mechanical properties of the hydrogels. The hydrogel-based strain sensor exhibits excellent sensitivity (gauge factor: 9.88), linearity (R 2 : 0.97), stretchable ability (stress: 0.67 MPa; strain: 404%), good cyclicity, and durability. The luminescent properties are endowed by the CQDs further broaden the application of hydrogels for realizing flexible electronics. More interestingly, the strain sensor based on CCCDs hydrogel demonstrates photo responsiveness (𝚫R/R 0 ≈20%) and pH responsiveness (pH range ≈4-7) performance. CCCDs hydrogels can be used for gesture recognition and light sensing switch. As a proof-of-concept, a smart wearable sensor is designed for monitoring human activities and detecting pH variation in human sweat during exercise. This study reveals new possibilities for further applications in wearable health monitoring.

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Section: Characterization Of the Structure And Fluorescence Propertie...mentioning

confidence: 99%

Section: Characterization Of the Structure And Fluorescence Propertie...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon Quantum Dot/Chitosan‐Derived Hydrogels with Photo‐stress‐pH Multiresponsiveness for Wearable Sensors

Wei

et al. 2023

Macromol. Rapid Commun.

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“…[30] Although new techniques have gained visibility in trace-metals detection like inductively coupled plasma atomic spectroscopy with mass detection (ICP-MS), [31] Energy dispersive x-ray fluorimetry (EDXRF), [20] and redissolving voltammetry. [31] Fluorescent methodologies based on probes have drawn the attention of scientists owning their application in heavy ions quantification based on a fast, robust, sensitive, selective, and low cost of acquisition compared to sophisticated equipment. [24,[32][33][34] In the last decade, CDs were the most common luminescent sensors used for this type of analysis.…”

Section: Introductionmentioning

confidence: 99%

Bottom‐Up Synthesis Optimization Through The Design Of Experiments Using Blue N,S‐Carbon Dots With Interesting Affinity For Potentially Toxic Elements

Silva de Araújo,

Costa Ferrer,

Seagesser Santos

et al. 2023

ChemistrySelect

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Water contamination by heavy metals is a global issue for environmental safety and new technologies have been developed aim to evaluate the contamination, mainly by anthropogenic action. In this work, we synthesized blue light‐emitting carbon dots (CDs) from ionic sources for sensing applications of heavy metal cations in an aqueous solution. Spectroscopic and morphologic characteristics of the CDs were performed using Fourier transform infrared (FTIR) spectroscopy, fluorescence, and absorption techniques, besides transmission electron microscopy (TEM), dynamic light scattering (DLS), and zeta potential (ZP) measurements. Moreover, a two‐level full factorial design of experiments (DOE) was carried out to achieve the best hydrothermal parameters of synthesis, including the number of mols of precursors, temperature, and reaction time. The pH and buffer nature were evaluated for the quantification step to improve the N,S‐CDs response. We have obtained a range of 2.23–8.57 μmol L−1 (among Bi3+, Cd2+, Hg22+, Hg2+, Pb2+, and Sb3+) in terms of limit of detection (LOD). These aspects frame the material as a potential sensor for the identification of heavy metals in water.

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“…Hence, they were appropriate for prospective applications as optical nanoprobes in the field of biomedical imaging. [6] Wang Y. et al developed a creative approach to fabricate ZnO-based organic solar cells, utilizing N,S-CDs modifiers prepared from ascorbic acid and ammonium persulfate. The N,S-CDs-modified ZnO showed a high power conversion efficiency of 9.31 %, which is higher than that of the reference ZnO solar cells.…”

Section: Introductionmentioning

confidence: 99%

Development of Carbon Dots Synthesized from Green Tea and Alpha‐hydroxyl Acids with Enhanced Antioxidant Activity, Photostability and UV Protection Properties

Nuntahirun,

Hanchaina,

Ratchatacharoensak

et al. 2023

ChemistrySelect

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The exhaustion of the ozone layer in the atmosphere has caused an escalation of dangerous UV radiation penetrating the earth's surface. Reactive oxygen species generated under UV exposure through photocatalytic reactions can lead to severe skin health risks, such as skin cancer and premature aging. Although chemical sunscreens are widely used for protection against UV radiation, their long‐term use poses safety concerns and causes environmental damage. In this regard, we have developed carbon dots (CDs) with excellent UV absorption along with extraordinary antioxidant activity, photostability, and biocompatibility from green tea as the main precursor and alpha‐hydroxy acids (AHA) as the co‐precursors, including gluconic acid (GA), citric acid (CA), and tartaric acid (TA). All CDs have a strong UV absorption, especially in the UVB and UVC regions, with G‐CDs having the highest UV absorption. The G‐CDs also have the highest antioxidant activity, which is also higher than that of their parent green tea, AHAs, and ascorbic acid, a well‐known antioxidant. The photostability and cell viability of the G‐CDs were also excellent. The potential of G‐CDs as multifunctional materials makes them a promising candidate for cosmetic applications, particularly for their ability to absorb UV radiation with exceptionally high antioxidant activity, photostability, and biocompatibility.

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Current scenario and recent advancement of doped carbon dots: a short review scientocracy update (2013–2022)

Cited by 32 publications

References 229 publications

Carbon Quantum Dot/Chitosan‐Derived Hydrogels with Photo‐stress‐pH Multiresponsiveness for Wearable Sensors

Carbon Quantum Dot/Chitosan‐Derived Hydrogels with Photo‐stress‐pH Multiresponsiveness for Wearable Sensors

Bottom‐Up Synthesis Optimization Through The Design Of Experiments Using Blue N,S‐Carbon Dots With Interesting Affinity For Potentially Toxic Elements

Development of Carbon Dots Synthesized from Green Tea and Alpha‐hydroxyl Acids with Enhanced Antioxidant Activity, Photostability and UV Protection Properties

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