Green-synthesized, pH-stable and biocompatible carbon nanosensor for Fe3+: An experimental and computational study

Raj, Savan K.; Choudhary, Babita; Yadav, Anshul; Patidar, Rajesh; Mishra, Avinash; Kulshrestha, Vaibhav

doi:10.1016/j.heliyon.2022.e09259

Cited by 10 publications

(8 citation statements)

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“…Furthermore, the broad satellite peak at 856.7 eV is owned by Ni 2p 3/2 of Ni 3+ , and the peak at 874.5 eV belongs to Ni 2p 1/2 of Ni 2+ . − The C 1s signal reveals two peaks that appeared at 285.3 and 287.7 eV, corresponding to C–H and CO/CN (Figure c). Also, for O 1s spectra, three peaks at 530.1, 532.0, and 533.45 eV were attributed to CO, C–OH, and C–O–C (Figure d) …”

Section: Resultsmentioning

confidence: 98%

“…Also, for O 1s spectra, three peaks at 530.1, 532.0, and 533.45 eV were attributed to C�O, C− OH, and C−O−C (Figure 5d). 37 Electrochemical Measurement. The performance of the HNNS electrocatalyst for OER was investigated in an alkaline medium (1 M KOH) utilizing electrochemical workstation (Meterohm Autolab PGSTAT204 potentiostat/galvanostat) in a three-electrode system.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Single-Step Synthesis of Well-Ordered Hierarchical Nickel Nanostructures for Boosting the Oxygen Evolution Reaction

et al. 2022

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Transition metal dichalcogenides (TMDCs) as electrocatalysts have been explored as active noble-metal-free porous structures with a high surface area for active metal centers for the oxygen evolution reaction (OER). Herein, we report the facile synthesis of a hierarchical nickel carbide nanostructure (HNNS) from nickel aluminum carbide for the OER. A synthesized nanostructured electrocatalyst shows better OER performance compared to a bare plastic chip electrode and nickel aluminum carbide. The electrocatalytic performance for the HNNS achieved the current density of 10 mA cm–2 at an overpotential of 175 mV with a Tafel slope of 54 mV dec–1 in an alkaline medium. The facile synthesis and intensified OER activity make it convenient to fabricate efficient and stable electrodes for well-functioning electrochemical water splitting. The obtained results were compared to the standard catalyst and are better than those attained by the previously reported state-of-the-art transition-metal-based electrocatalyst. This work effectively improves ceaseless efforts toward low-cost electrocatalysts by taking advantage of the merits of TMDCs and will provide more opportunities for their utilization in electrochemical applications.

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Section: Resultsmentioning

confidence: 98%

Section: ■ Results and Discussionmentioning

confidence: 99%

Single-Step Synthesis of Well-Ordered Hierarchical Nickel Nanostructures for Boosting the Oxygen Evolution Reaction

et al. 2022

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“…Studies show that species with a lower energy gap have higher reactivity and therefore higher absorption energy (Figure 11 and Table 2). [43][44][45] The results show that the sensor energy gap in the presence of Hg 2 + cation is minimized. This is while there was no significant change in the energy gap in the presence of other cations.…”

Section: Molecular Electronic Properties Energy Gapmentioning

confidence: 90%

“…Studies show that species with a lower energy gap have higher reactivity and therefore higher absorption energy (Figure 11 and Table 2). [43–45] …”

Section: Methodsmentioning

confidence: 99%

An Experimental and Quantum (QTAIM) Performance Study of a Proposed Molecular Chemosensor: A Quinazolinone‐Based Sensor for Hg²⁺ Ion Detection

et al. 2023

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This work synthesized a novel colorimetric ligand based on the compound quinazolinone (Sensor) and investigated it. The sensing activity of the sensor toward different cation was studied. The sensor demonstrated a highly selective colorimetric sensing toward Hg 2 + with a detection limit of 0.1 ppb and visual color change from colorless to Purple in methanol-water solvents (v/v, 10,90). The cation binding character was determined using visual inspection, UV-Vis, and fluorescence analyses. In the computational part, the interaction between the receptor and Hg 2 + ion was investigated using density functional theory (TD-DFT) and quantum theory of atoms in molecules (QTAIM) in the solution phase (in the presence of water as solvent and the CPCM model). Theoretical studies have shown that electronic properties such as energy gap, absorption energy, charge/energy transfer, and optical properties change dramatically in the presence of Hg 2 + cations. Also, the effect of the electric field on the electronic properties of the sensor/Hg 2 + complex improved the Hg 2 + cation adsorption process.

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“…Photoluminescent nanomaterials like carbon dots (CDOTs) have potential for simple and rapid sensing of metal ions. − For instance, Wu et al have reported a fluorescence turn-off method for detection of Fe(III) where the fluorescence intensity of CDOTs decreases with an increase in Fe(III) concentration with the linear relationship in the range of 0.1–2 mM and a limit of detection (LOD) of 0.57 μM . CDOTs and their composites have also been bestowed for the detection of GSH.…”

Section: Introductionmentioning

confidence: 99%

Biogenic Carbon Dot-Embedded Chitosan Hydrogels as a Two-Stage Fluorescence OFF–ON Probe for Sequential and Ratiometric Detection of Fe(III) and Glutathione

Thakkar,

Bhandary,

Thakore

2023

ACS Appl. Nano Mater.

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Biogenic carbon dots (BCDs) are useful fluorescence sensors for selective detection of toxic metals. In the present work, we propose to synthesize a hybrid fluorescent chitosan gel using BCDs for detection and enrichment of Fe(III) ions and subsequent ratiometric detection of glutathione (GSH). Carbon dots were synthesized using waste lemon peels (LCDs) as the precursor. The sensing studies showed the selectivity and ultrasensitivity of the LCD sensor toward Fe(III) in the presence of other metal ions with a limit of detection as low as 17 pM. The visual as well as PL studies demonstrated that the LCD sensing probe is free from any significant interference. The LCDs were successfully fabricated to develop “in-house” paper-based kits for in situ and on-site detection of Fe(III). Further, a fluorescent chitosan-based hydrogel (CDG) was synthesized by conjugation of LCDs for the selective uptake and enrichment of Fe(III), which led to quenching of fluorescence with >90% encapsulation. Post enrichment, the Fe(III) enriched LCD hybrid hydrogel (Fe@CDG) was further applied for the selective and ultrasensitive detection of GSH with the limit of detection of 15.22 pM. The sensing studies showed that the detection of GSH is free from any interference. Thus, the fluorescent hydrogel exhibited quenching on entrapment of Fe(III) (Turn OFF) and recurrence of fluorescence on the release of entrapped Fe(III) in the presence of GSH (Turn ON). Additionally, LCDs and the CDG demonstrated potential antibacterial activity, annihilating bacteria in water samples in less than 10 min of photoexcitation, due to the potential ROS generation ability of the LCDs.

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Green-synthesized, pH-stable and biocompatible carbon nanosensor for Fe3+: An experimental and computational study

Cited by 10 publications

References 62 publications

Single-Step Synthesis of Well-Ordered Hierarchical Nickel Nanostructures for Boosting the Oxygen Evolution Reaction

Single-Step Synthesis of Well-Ordered Hierarchical Nickel Nanostructures for Boosting the Oxygen Evolution Reaction

An Experimental and Quantum (QTAIM) Performance Study of a Proposed Molecular Chemosensor: A Quinazolinone‐Based Sensor for Hg²⁺ Ion Detection

Biogenic Carbon Dot-Embedded Chitosan Hydrogels as a Two-Stage Fluorescence OFF–ON Probe for Sequential and Ratiometric Detection of Fe(III) and Glutathione

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Green-synthesized, pH-stable and biocompatible carbon nanosensor for Fe3+: An experimental and computational study

Cited by 10 publications

References 62 publications

Single-Step Synthesis of Well-Ordered Hierarchical Nickel Nanostructures for Boosting the Oxygen Evolution Reaction

Single-Step Synthesis of Well-Ordered Hierarchical Nickel Nanostructures for Boosting the Oxygen Evolution Reaction

An Experimental and Quantum (QTAIM) Performance Study of a Proposed Molecular Chemosensor: A Quinazolinone‐Based Sensor for Hg2+ Ion Detection

Biogenic Carbon Dot-Embedded Chitosan Hydrogels as a Two-Stage Fluorescence OFF–ON Probe for Sequential and Ratiometric Detection of Fe(III) and Glutathione

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An Experimental and Quantum (QTAIM) Performance Study of a Proposed Molecular Chemosensor: A Quinazolinone‐Based Sensor for Hg²⁺ Ion Detection