Fluorescence turn-off sensing of TNT by polyethylenimine capped carbon quantum dots

Şen, Furkan Burak; Beğiç, Nilay; Bener, Mustafa; Apak, Reşat

doi:10.1016/j.saa.2022.120884

Cited by 25 publications

(7 citation statements)

References 46 publications

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“…Then the samples were analyzed using a HPLC/DAD system according to the literature with slight modification. 48 The experimental details of HPLC analysis are given in the ESI †. In the HPLC method, a series of TNT methanol solutions were prepared (10, 20, 50, 100 and 200 μg mL −1 ) and the standard working curve was constructed (Fig.…”

Section: Resultsmentioning

confidence: 99%

Polyethyleneimine-capped copper nanoclusters for detection and discrimination of 2,4,6-trinitrotoluene and 2,4,6-trinitrophenol

Wang

Cai

et al. 2022

Anal. Methods

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Section: Resultsmentioning

confidence: 99%

Polyethyleneimine-capped copper nanoclusters for detection and discrimination of 2,4,6-trinitrotoluene and 2,4,6-trinitrophenol

Wang

Cai

et al. 2022

Anal. Methods

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“…Next, a selective and sensitive detection of TNT explosive residues based on CD-modified optical sensors has been developed and rapidly elevating until 2022 [ 99 , 139 , 196 , 214 , 248 ]. The research concluded that the possible mechanism for TNT detection corresponds to the Jackson–Meisenheimer (JM) complex.…”

Section: Application Of Cd-based Optical Sensor For Environmental Mon...mentioning

confidence: 99%

“…All the proposed CD-based optical sensors for the detection of explosive compounds are tabulated orderly in Table 13. [196] Where N-rich CNDs: nitrogen-rich carbon nanodots, M-MIPs@CDs: mesoporous structured molecularly imprinted polymers capped carbon dots, CQDs@PAMAM-NH 2 : carbon quantum dots functionalized with amine groups by PAMAM dendrimer, EDA: ethylenediamine, CDs and Fe@SiO 2 -NH 2 : carbon dots and the magnetism of amino-functionalized magnetic core-shell nanomaterial, PEI-CQDs: polythylenimine capped carbon quantum dots.…”

Section: Explosive Compoundsmentioning

confidence: 99%

A Review on Carbon Dots: Synthesis, Characterization and Its Application in Optical Sensor for Environmental Monitoring

et al. 2022

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The development of carbon dots (CDs), either using green or chemical precursors, has inevitably led to their wide range application, from bioimaging to optoelectronic devices. The reported precursors and properties of these CDs have opened new opportunities for the future development of high-quality CDs and applications. Green precursors were classified into fruits, vegetables, flowers, leaves, seeds, stem, crop residues, fungi/bacteria species, and waste products, while the chemical precursors were classified into acid reagents and non-acid reagents. This paper quickly reviews ten years of the synthesis of CDs using green and chemical precursors. The application of CDs as sensing materials in optical sensor techniques for environmental monitoring, including the detection of heavy metal ions, phenol, pesticides, and nitroaromatic explosives, was also discussed in this review. This profound review will offer knowledge for the upcoming community of researchers interested in synthesizing high-quality CDs for various applications.

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“…For the last two decades, carbon quantum dots (CQDs) as a zero-dimensional carbon nanomaterial, which have sizes lower than 10 nm have gained intense interest due to their impressive advantages, including their widespread source of precursors, small sizes, strong photoluminescence (PL), high biocompatibility and photostability, low cytotoxicity and, flexible surface structures [1][2][3][4]. With their unique properties, CQDs have been employed in various applications such as chemical sensing, biosensing, photocatalysts, energy storage, and biomedical applications [5][6][7][8][9]. Unlike other carbon-based nanomaterials, CQDs possess a graphitic core composed of sp 2 /sp 3 hybrid with numerous functional groups, which consist of primarily oxygen-related groups and post-modified chemical groups on the surface [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

pH-Sensitive Fluorescence Emission of Boron/Nitrogen Co-Doped Carbon Quantum Dots

et al. 2023

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Carbon quantum dots (CQDs) with their strong photoluminescence (PL) activity, high biocompatibility, robust stability, low cytotoxicity, and flexible surface structures have been employed in many fields including chemical sensing, biosensing, photocatalyst, energy storage, and biomedical applications. Of note, CQDs present an intrinsic pH-sensitive PL nature indicating their intense potential for pH-mediated sensing and imaging. Despite the numerous studies performed in the last two decades, the pH-sensitive PL mechanism of CQDs is still under debate and must be clarified to overcome the limitations in practical applications. Therefore, in this report, we performed a systematical study to determine the pH-sensitive PL nature of boron/nitrogen co-doped CQDs (B/N CQDs). In the first part, B/N CQDs with a strong blue emission were fabricated via a hydrothermal synthesis procedure. B/N-CQDs showed a strong blue PL emission with high quantum yield and excitation-dependent nature. Under the low pH conditions (pH 3), B/N-CQDs exhibited a robust green fluorescence emission with a significant red-shift (48 nm) and the loss of the excitation-dependent nature. The change in PL nature originated from the protonation of surface groups, a decrease in negative surface charge (from −20.6 to −1.23 eV), and finally, aggregation of the nanostructure (the size of CQDs from 4.8 to 7.5 nm). However, in the case of alkaline conditions, the deprotonation surface groups significantly enhanced the surface charge and led to the emergence of a negative ‘protective shell’ with a zeta potential of −71.3 eV. In a high pH medium (pH 13), PL spectra showed the loss of excitation-dependent features and a red-shift (35 nm) in emission peak maxima with lower intensity. This report provides significant progress in the clarification of the pH-sensitive PL mechanism of CQDs. We envision that the proposed CQDs would provide unique opportunities in the fabrication of novel pH sensor systems and fluorescence imaging where a wide range of pH sensitivity is required.

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Fluorescence turn-off sensing of TNT by polyethylenimine capped carbon quantum dots

Cited by 25 publications

References 46 publications

Polyethyleneimine-capped copper nanoclusters for detection and discrimination of 2,4,6-trinitrotoluene and 2,4,6-trinitrophenol

Polyethyleneimine-capped copper nanoclusters for detection and discrimination of 2,4,6-trinitrotoluene and 2,4,6-trinitrophenol

A Review on Carbon Dots: Synthesis, Characterization and Its Application in Optical Sensor for Environmental Monitoring

pH-Sensitive Fluorescence Emission of Boron/Nitrogen Co-Doped Carbon Quantum Dots

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