Ethylenediamine mediated luminescence enhancement of pollutant derivatized carbon quantum dots for intracellular trinitrotoluene detection: soot to shine

Devi, Sarita; Gupta, Raju Kumar; Paul, A.K.; Kumar, Vinay; Sachdev, Abhay; Gopinath, P.; Tyagi, Sachin

doi:10.1039/c8ra06460a

Cited by 41 publications

(37 citation statements)

References 49 publications

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“…Devi et al. [ 51 ] reported that a simple hydrothermal method to yield CQDs with an average size of 4.2 nm using soot as carbon source. The recycling of kitchen waste can reduce the amount of organic matter entering the landfill, reduce the generation of odor and landfill leachate, and avoid the adverse impact of excessive moisture on waste incineration.…”

Section: Carbon Source and Synthesis Methods Of Biomass Carbon Dotsmentioning

confidence: 99%

Recent advances of biomass carbon dots on syntheses, characterization, luminescence mechanism, and sensing applications

et al. 2021

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Carbon dots have attracted much attention due to their high fluorescence intensity, easy modification, good stability, and biocompatibility. However, the realization of low‐cost mass production of high‐quality carbon dots still faces great challenges. Biomass is of non‐toxic and environmentally friendly organism, but a lot of biomass is treated as waste for burning and landfill at present, causing irreparable pollution to the environment. In fact, many biomass resources are ideal candidates for preparing carbon dots. This review focuses on carbon dots including carbon quantum dots (CQDs) and graphene quantum dots (GQDs) which using biomass as carbon source on the aspects of plants and their derivatives, animals and their derivatives and municipal waste. The characterization of the structure and composition of biomass carbon dots, the regulation of fluorescence color and the methods of improving quantum yield (QY) including heteroatom doping and surface modification are introduced in detail. Moreover, biomass carbon dots for detecting metal ions and non‐metal molecules and their quenching mechanism are emphatically introduced in addition to summarizing the luminescence mechanism, and some promising prospects and challenges in this uplifting field are discussed.

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Section: Carbon Source and Synthesis Methods Of Biomass Carbon Dotsmentioning

confidence: 99%

Recent advances of biomass carbon dots on syntheses, characterization, luminescence mechanism, and sensing applications

et al. 2021

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“…[7][8][9][10] Due to the use of biomolecular precursors, the as-synthesized uorescent biodots are oen endowed with inherent biocompatibility, good aqueous solubility, chemical stability and inertness 11,12 suitable for a wide range of biomedical applications. [13][14][15][16] For example, uorescent biodots derived from long chain DNAs have been developed for metal ion sensing (e.g., Hg 2+ , Ag + , and Fe 2+ ), bioimaging and drug delivery. 11,12,[17][18][19] However, all these studies do not investigate the contribution of the four basic units of DNA (i.e., deoxyadenosine, deoxyguanosine, deoxythymidine and deoxycytidine nucleotides) to the formation of the resultant biodots, which are important to tailor the biodot properties for specic biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

Nucleotide-derived theranostic nanodots with intrinsic fluorescence and singlet oxygen generation for bioimaging and photodynamic therapy

2019

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“…The oxidative acid (H 3 PO 4 ) breaks down PGS into nanosized particles (GQD2) at high temperature (200 °C) and enhances the solubility due to attachment of oxygen functionalities on the edges. 43 The purpose of using diamine was to minimize the surface defects and yield great optical properties. 44 The removal of extra polymers needs more dialysis time (1 week) as compared to small organic molecules of amine solution (24 h), employed as passivation agents to functionalize GQDs.…”

Section: Resultsmentioning

confidence: 99%

Avenue to Large-Scale Production of Graphene Quantum Dots from High-Purity Graphene Sheets Using Laboratory-Grade Graphite Electrodes

et al. 2020

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Graphene has unprecedented physical, chemical, and electronic properties, but need of the hour is to develop low-dimensional nanomaterials, such as graphene quantum dots (GQDs), that could be incorporated into nanoscale devices. This article depicts the production of GQDs from ultrafine, thin (0.8–1 nm), bilayer graphene sheets (GSs) possessing large micron-sized lateral dimension, low defect density ( I D / I G : 0.1), and oxidation degree (C/O ratio: 27) of lowest level, in contrast to many other techniques where synthesis of GSs was done using analytical-grade expensive graphite electrodes. This low-cost manufacturing of GSs for industrial-scale applications was achieved by utilizing only 99%-purity graphite electrodes. The variants of such graphite electrodes (graphite rod, film, pencil) are etched in different pH electrolytes (H 2 SO 4 , NaCl, NaOH) via prompt electrochemical exfoliation, each giving more than 50% yield. Nowadays, semiconductor quantum dots (QDs) are utilized in smart device production industries, but their toxicity is a major issue of concern. Therefore, the dimension of this two-dimensional (2D) material is reduced to <10 nm to generate GQDs. A facile and highly reproducible approach has been reported for the large-scale generation of GQDs (size ca. 6–10 nm) with minimal surface defects. The protocol followed in this article to synthesize GQDs involves the use of ethylenediamine (en), which passivates the surface and reduces defects, thereby enhancing the optical properties. We demonstrate the correlation of the electrochemical and hydrothermal parameters with the growth mechanism and morphological, structural, chemical, and optical properties of the graphene nanomaterials. Raman spectroscopy and X-ray diffraction (XRD) reveal the structural configurations of GSs and GQDs to investigate the nature of defects. Field emission scanning electron microscopy (FESEM) confirms the morphological characteristics of the as-prepared GSs and GQDs with energy-dispersive X-ray (EDX) analysis determining the C/O ratio. The optical properties like UV–visible absorption and fluorescence assays show the quantum confinement effect phenomenon in GQDs. The obtained GSs and GQDs display enhanced solution stability in DI water and other solvents due to controllable oxidation degree as elucidated through Fourier transform infrared (FTIR) analysis.

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Ethylenediamine mediated luminescence enhancement of pollutant derivatized carbon quantum dots for intracellular trinitrotoluene detection: soot to shine

Abstract: Vehicle-generated toxic pollutants are composed of gaseous smoke and particulate byproducts accumulated as a black substance at its exhaust.

Cited by 41 publications

References 49 publications

Recent advances of biomass carbon dots on syntheses, characterization, luminescence mechanism, and sensing applications

Recent advances of biomass carbon dots on syntheses, characterization, luminescence mechanism, and sensing applications

Nucleotide-derived theranostic nanodots with intrinsic fluorescence and singlet oxygen generation for bioimaging and photodynamic therapy

Avenue to Large-Scale Production of Graphene Quantum Dots from High-Purity Graphene Sheets Using Laboratory-Grade Graphite Electrodes

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