‘Luminescent carbon nanodots: Current prospects on synthesis, properties and sensing applications’

Kottam, Nagaraju; Smrithi, S. P.

doi:10.1088/2050-6120/abc008

Cited by 27 publications

(12 citation statements)

References 187 publications

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“…[26] The upconversion PL mechanism is anti-Stokes luminescence. [27] When low energy light excites the electrons in the π orbitals, the Reproduced with permission. [22] Copyright 2022, Academic Press Inc.…”

Section: Upconversion Photoluminescencementioning

confidence: 99%

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Application Progress of Green Carbon Dots in Analysis and Detection

Zuo

et al. 2022

Part & Part Syst Charact

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Green chemistry is currently attracting more and more attention due to its eco‐friendly, and green carbon dots (g‐CDs) are creating a research boom. The g‐CDs have huge application prospects in analysis and detection due to their excellent optical properties, high biocompatibility, and low toxicity compared to other fluorescent materials. Based on the study of g‐CDs, the optical properties, synthesis methods, surface modification methods, and sensing mechanisms of g‐CDs are outlined, and the application in analysis and detection of environmental, food, biomolecules, and other organic small molecules are reviewed. At the same time, the challenges faced by g‐CDs are outlined. This review provides valuable references for further research and wider application of g‐CDs.

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Section: Upconversion Photoluminescencementioning

confidence: 99%

“…[ 26 ] The upconversion PL mechanism is anti‐Stokes luminescence. [ 27 ] When low energy light excites the electrons in the π orbitals, the π electrons are lifted to a higher energy state and then fall back to the lower energy σ state, and upconversion PL occurs. Zhang et al.…”

Section: Optical Propertiesmentioning

confidence: 99%

Application Progress of Green Carbon Dots in Analysis and Detection

Zuo

et al. 2022

Part & Part Syst Charact

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“…Over the past few years, carbon dots (CDs), have been the focus of intense scientific research. − CDs are carbonaceous 0-dimensional nanoparticles below 100 nm in diameter with graphene cores and photoluminescent properties. They are highly biocompatible and have various functional groups which make them easy to modify.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanodots with Solvatochromic Photoluminescence for the Electrochemical Determination of Estrogenic Steroids

Mikhraliieva

Tkachenko

Freire

et al. 2022

ACS Appl. Nano Mater.

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Herein, we utilized carbon nanodots (R-CNDs) for the electrochemical detection of estrogens in tap and natural water samples and simulated effluents from Swedish waste water treatment plants (WWTPs). R-CNDs were prepared from 2-aminophenol by solvothermal synthesis and used as a modifier for chitosan-based selective membranes. The data obtained from atomic force microscopy and transmission electron microscopy suggest a spherical morphology of the R-CNDs with lateral size in the range of 3–8 nm and the height of 1–8 nm. In contrast to most other known carbon nanodots, R-CNDs are soluble in various organic solvents, including apolar, and less soluble in water. Small nanodots (3 nm) are more hydrophilic than large ones (6–8 nm) and can be separated from the bulk suspension of R-CNDs in heptane by their extraction into a water/ethanol mixture. Suspensions of large R-CNDs in apolar solvents exhibit green photoluminescence, while small R-CNDs in polar solvents have orange. This phenomenon was attributed to a solvatochromic rather than to a quantum effect. The R-CNDs were embedded on a chitosan-modified pencil electrode and the electrode was applied for voltammetric determination of four abandoned estrogens: estrone, estradiol, estriol, and ethynyl estradiol. The sensor demonstrates a group-selective response to the estrogens with a detection limit of 17.0 nmol L–1. It can be applied to determine the estrogens in the range of 0.05–4.6 μmol L–1 in the presence of typical interfering bioactive compounds, such as paracetamol, uric acid, progesterone, sulfamethoxazole, trimethoprim, ibuprofen, and caffeine. The developed sensors show repeatability and reproducibility values of 1.8–3.4% and 4.3%, respectively. The efficiency was proved by application for tap and lake water samples, where the recovery range was found to be 93–100%. The low cost, stability, and high sensitivity and selectivity of fabricated sensors make R-CNDs a perspective modifier for electrochemical sensors for the detection of estrogen microquantities in variable water samples.

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“…Exfoliated GO can be chemically shredded to GOQDs with good yield by W 18 O 49 , KMnO 4 , KHSO 5 , and KO 2 . 2,12,46,47 Although powerful oxidants showed high efficiency, it is a tedious task to purify the nanoparticles for metal ion impurities, 36 which may cause undesirable phenomena, such as lowered biocompatibility (in some cases, even toxicity), lowered luminescence efficiency or reduced ability as carriers of active substances. 48,49 Therefore, sophisticated purication techniques are required for GOQDs purication.…”

Section: Introductionmentioning

confidence: 99%