Fluorescent carbon nano-materials from coal-based precursors: unveiling structure–function relationship between coal and nano-materials

Kundu, Niloy; Sadhukhan, Dhrubajyoti; Sarkar, Supriya

doi:10.1007/s42823-021-00315-5

Cited by 9 publications

(4 citation statements)

References 101 publications

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“…From the data obtained, it can be concluded that larger R-CNDs particles are more soluble in lipophilic media. This phenomenon can be explained by the greater hydrophobicity of the larger R-CNDs, which like most other CNDs, having hydrophobic graphene cores and hydrophilic edges . Thus, small particles having a higher surface (hydrophilic) to volume (hydrophobic) ratio, making them more hydrophilic than larger particles.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Their syntheses and properties have already been properly reviewed elsewhere. [28,34] In this section, we will briefly describe the progress of these coal-based nanomaterials, summarize the common issues, and propose possible solutions to bridge their performance gaps with their commercial counterparts.…”

Section: Other Coal-based Nanomaterialsmentioning

confidence: 99%

“…In terms of synthesis methods, coal‐based CDs were also made by a supercritical fluid method, a hydroxyl radicals (OH*) method, a solvothermal method in N,N ‐dimethylformamide (DMF), and a pulsed laser ablation method in liquid. [ 34 ] Those methods all show promising results without using acids, which is more environmentally friendly. However, more research has to be performed to further validate their feasibility and scalability toward commercialization.…”

Section: Coal‐based Cdsmentioning

confidence: 99%

“…For example, fullerene can act as an effective electron buffer for catalytic reactions, [ 50 ] coal‐derived fullerenes either provided few convincing characterizations, or their quality and purity are too low to be commercially implemented. A similar scenario occurs with NDs, coal‐derived NDs are produced using liquid laser ablation, ultrasonic methods, strong acid oxidation methods, and electron beam irradiation, [ 34 ] but none of them provided mechanical, electrical, and thermal evaluations necessary to reveal their efficacy for downstream applications. CNTs are widely used as reinforcement fillers for composite materials and batteries.…”

Section: Other Coal‐based Nanomaterialsmentioning

confidence: 99%

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Coal‐Based Carbon Nanomaterials: En Route to Clean Coal Conversion toward Net Zero CO₂

Advincula

Ding

et al. 2023

Advanced Materials

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As the world is committed to reach carbon peak by 2030 and net zero by 2050, the use of coal as an energy source is facing unprecedented challenges. According to the International Energy Agency (IEA), global annual coal demand is estimated to drop from more than 5640 million tonnes of coal equivalent (Mtce) in 2021 to 540 Mtce in 2050 under the net zero emission scenario, mostly being replaced by renewable energy such as solar and wind. Therefore, the coal industry is vigorously seeking alternative applications to keep it thriving, and nanotechnology can be one of the contributors. Herein, the challenges to coal-based carbon nanomaterials syntheses are outlined, along with a path toward commercialization. Coal-based carbon nanomaterials can be promising contributors to the concept of clean coal conversion, initiating its migration from an energy source to a high-value-added carbon source.

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Electromagnetic properties of coal using microstrip and an algorithm based on the Nicolson-Ross-Weir method

Mancipe-Huérfano,

García-Cáceres

2024

Int. j. inf. tecnol.

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The work implements an experimental methodology to find the dielectric parameters: electrical permittivity, effective permittivity, magnetic permeability, conductivity, absorption coefficient, impedance, and loss tangent of bituminous coal from the municipality of Morcá and Tópaga belonging to the Sogamoso-Jericó sub-basin of the Guaduas formation, one of the most important coal reserves in Colombia. The methodology, known for its efficiency, includes constructing a microstrip-type circuit, measuring scattering parameters or S-parameters at frequencies between 300 kHz and 1 GHz with a vector network analyzer, and extracting electromagnetic properties using the Nicolson-Ross-Weir algorithm. The implemented algorithm allowed us to see the behavior of the coal in a fraction of the ultra-high frequency band and to find quickly and easily the approximate values of the parameters as a function of frequency, which are very important for investigations in mathematical modeling and computational electromagnetics. The results show that the real and imaginary components of the relative dielectric permittivity decrease with increasing frequency, and the absorption coefficient and the loss tangent of the coal increase as a function of frequency, indicating that the coal behaves as a dissipative dielectric.

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Fluorescent carbon nano-materials from coal-based precursors: unveiling structure–function relationship between coal and nano-materials

Cited by 9 publications

References 101 publications

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

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

Coal‐Based Carbon Nanomaterials: En Route to Clean Coal Conversion toward Net Zero CO₂

Electromagnetic properties of coal using microstrip and an algorithm based on the Nicolson-Ross-Weir method

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Fluorescent carbon nano-materials from coal-based precursors: unveiling structure–function relationship between coal and nano-materials

Cited by 9 publications

References 101 publications

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

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

Coal‐Based Carbon Nanomaterials: En Route to Clean Coal Conversion toward Net Zero CO2

Electromagnetic properties of coal using microstrip and an algorithm based on the Nicolson-Ross-Weir method

Contact Info

Product

Resources

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Coal‐Based Carbon Nanomaterials: En Route to Clean Coal Conversion toward Net Zero CO₂