Nitrogen and Phosphorus Co-Doped Carbon Dots for Selective Detection of Nitro Explosives

Babar, Dipak Gorakh; Garje, Shivram S.

doi:10.1021/acsomega.9b03234

Cited by 51 publications

(28 citation statements)

References 61 publications

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“…The peak at 284.2 eV is due to the graphitic structure of C=C, while the respective peak at 284.7 eV corresponds to either CÀ C or CÀ P bonds. [28] In addition, significant peaks at 285.6 eV and 286.7 eV correspond to CÀ N/CÀ (OH) and CÀ N/CÀ O, respectively. Furthermore, the peak at 289.17 eV is attributed to the presence of OÀ C=O.…”

Section: Resultsmentioning

confidence: 99%

Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Kar

Bramhaiah

John

et al. 2021

Chemistry An Asian Journal

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Carbon dots (CDs) have become one of the most emerging materials as an alternative solar light-induced photocatalyst in contrast to traditional metal-based systems. However, one of the major challenges is the lack of visible light absorption. Herein, we have fabricated unique N, P-codoped CDs with a self-assembled onion-like layered structure by using a bottom-up facile synthesis technique from chitosan gel and phosphoric acid as molecular precursors. This typical layered structure of N, P-co-doped carbon nano onions (N, P-CNOs), with an average size of 25-50 nm, displays an enhanced visible light absorption. Detailed structural and elemental characterizations confirm the extensive aromatic domain with P-containing surface functionalities, while electrochemical study clarifies the lowering of band gaps as well as the creation of new electronic states in comparison to the pristine N-CDs. Furthermore, the intrinsic structural features are correlated with the underpinning photophysical processes by steady-state and time-resolved fluorescence spectroscopy. In addition, steady-state polarized emission and thermo-responsive PL properties have been carried out to unveil further the structure-property correlation of N, P-CNOs, and their comparative study with pristine N-CDs at the different excitation wavelengths. Finally, N, P-CNOs exhibit efficient visible-light-induced photocatalysis, and the detailed mechanistic study is carried out by trapping the photogenerated species in an aqueous medium. The prepared N, P-CNOs displayed an excellent visible-light photocatalytic performance over MB dye with a degradation efficiency of 75.8% within 120 min along with a degradation rate constant of~0.0109 min À 1 . It is concluded that the easy to synthesize and low-cost N, P-CNOs with a unique morphology hold great potential for application in visiblelight photocatalysis.

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Section: Resultsmentioning

confidence: 99%

Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Kar

Bramhaiah

John

et al. 2021

Chemistry An Asian Journal

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“…44 However, lab-based techniques are very cost-effective, require sophisticated instruments, and tedious procedure for sample preparation. 45 Various fluorescence carbon materials offer selective and sensitive detection of nitro explosive compounds including manganese doped carbon quantum dots, 42 boron nitride QDs, 46 metal organic-frameworks, 46−48 and hybrid CdTe QDs. 49 Nevertheless, these methods have a few drawbacks like the use of organic solvent, high cost, multiple precursors, doping of elements, tedious process, nonbiocompatibility, pH instability, and time-consuming.…”

Section: Selective Detection Of Trinitrophenol (Tnp) Acidmentioning

confidence: 99%

Applications of N-Doped Carbon Dots as Antimicrobial Agents, Antibiotic Carriers, and Selective Fluorescent Probes for Nitro Explosives

Saravanan

Maruthapandi

Das

et al. 2020

ACS Appl. Bio Mater.

115

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The synthesis of nitrogen-doped carbon dots (N@CDs) was accomplished by a hydrothermal process using meta-phenylenediamine as a source of carbon and nitrogen. As prepared N@CDs exhibited bright blue color fluorescence emission (λ ex = 340 nm and λ em = 420 nm) with a quantum yield of 12%. Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus were eradicated by N@CDs with a minimum inhibition concentration (MIC) of 1 and 0.75 mg/mL, respectively. The N@CDs were also proven as nanovesicles for drug molecules where the drug release displayed a sustained time-dependent profile at the physiological condition. The release of ciprofloxacin as a model drug was governed by the Korsmeyer-Peppas model, indicating ∼60% of its release from the N@CD conjugated drug system at the physiological pH. Selective analysis of trinitrophenol (TNP), a popular explosive, was achieved by fluorescence quenching of N@CDs, compared favorably with other nitrophenols. An estimated detection limit of TNP was 2.45 μM with a linear response spanning from 1 to 75 μM.

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“… 61 The photoluminescent stability for polymerizing carbon dots in a solid state as a nanocomposite is sometimes more stable than polymerization in solution, preserving luminescence for up to four months. 61 Carbon dots-based sensors are utilized for selective detection of pollutants, 62 metal ions, 63 biomarkers, 64 biomolecules, 65 explosives, 66 vitamins, 67 and drugs. 68 For example, a carbon dots-based fluorescent sensor is reported to monitor select ions (Cu 2+ , S 2– ) with high selectivity and sensitivity while having low cytotoxicity and high photostability in aqueous media, lasting up to 35 days.…”

Section: Introductionmentioning

confidence: 99%

Optical Detection of Acetone Using “Turn-Off” Fluorescent Rice Straw Based Cellulose Carbon Dots Imprinted onto Paper Dipstick for Diabetes Monitoring

et al. 2022

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Persistent bad breath has been reported as a sign of serious diabetes health conditions. If an individual’s breath has a strong odor of acetone, it may indicate high levels of ketones in the blood owing to diabetic ketoacidosis. Thus, acetone gas in the breath of patients with diabetes can be detected using the current easy-to-use fluorescent test dipstick. In another vein, rice straw waste is the most well-known solid pollutant worldwide. Thus, finding a simple technique to change rice straw into a valuable material is highly important. A straightforward and environmentally friendly approach for reprocessing rice straw as a starting material for the creation of fluorescent nitrogen-doped carbon dots (NCDs) has been established. The preparation process of NCDs was carried out via one-pot hydrothermal carbonization using NH 4 OH as a passivation substance. A testing strip was developed on the basis of cellulose CD nanoparticles (NPs) immobilized onto cellulose paper assay. The NCDs demonstrated a quantum yield of 23.76%. A fluorescence wavelength was detected at 443 nm upon applying an excitation wavelength of 354 nm. NCDs demonstrated remarkable selectivity for acetone gas as their fluorescence was definitely exposed to quenching by acetone as a consequence of the inner filter effect. A linear correlation was observed across the concentration range of 0.5–150 mM. To detect and measure acetone gas, the present cellulose paper strip has a “switch off” fluorescent signal. A readout limit was accomplished for an aqueous solution of acetone as low as 0.5 mM under ambient conditions. The chromogenic fluorescence of the cellulose assay responsiveness depends on the fluorescence quenching characteristic of the cellulose carbon dots in acetone. A thin fluorescent cellulose carbon dot layer was deposited onto the surface of cellulose strips by a simple impregnation process. CDs were made using NP morphology and analyzed using infrared spectroscopy and transmission electron microscopy. The carbon dot distribution on the paper strip was evaluated by scanning electron microscope and energy-dispersive X-ray analysis. The absorption and fluorescence spectral analyses were investigated. The paper sheets’ mechanical qualities were also examined.

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Nitrogen and Phosphorus Co-Doped Carbon Dots for Selective Detection of Nitro Explosives

Cited by 51 publications

References 61 publications

Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Insight into the Multistate Emissive N, P‐doped Carbon Nano‐Onions: Emerging Visible‐Light Absorption for Photocatalysis

Applications of N-Doped Carbon Dots as Antimicrobial Agents, Antibiotic Carriers, and Selective Fluorescent Probes for Nitro Explosives

Optical Detection of Acetone Using “Turn-Off” Fluorescent Rice Straw Based Cellulose Carbon Dots Imprinted onto Paper Dipstick for Diabetes Monitoring

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