Sensitive detection of auric and sulphide ions using hybrid silver/nitrogen-doped carbon nanoparticles

Tantubay, Sangeeta; Kalita, Himani; Pathak, Amita

doi:10.1016/j.snb.2020.129276

Cited by 10 publications

(4 citation statements)

References 68 publications

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“…The interlayer spacing ( d 002 ) of the (002) plane was found to be 0.38 nm which is analogous but slightly greater as compared to the pure graphitic plane (0.34 nm) of carbon. Shifting of the 2θ value from ∼26° (in pure graphitic carbon) to ∼23.36° (NCDs) corresponding to the d 002 plane could be attributed to the poor graphitic crystallinity, presence of surface functional groups, and the small average particle size of NCDs. , …”

Section: Resultsmentioning

confidence: 99%

“…Shifting of the 2θ value from ∼26°(in pure graphitic carbon) to ∼23.36°( NCDs) corresponding to the d 002 plane could be attributed to the poor graphitic crystallinity, presence of surface functional groups, and the small average particle size of NCDs. 29,30 To analyze the presence of various surface functional groups in NCDs, the FTIR spectrum of NCDs was recorded and is shown in Figure S1b. Peaks assigned at ∼3215, 3350, and 3444 cm −1 corresponds to the stretching vibrations of N−H and O− H. 31,32 Peak observed at 2935 and 3070 cm −1 corresponds to the stretching vibrations of C−H bond.…”

Section: Detection Of Pamentioning

confidence: 99%

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Blue-Emissive Nitrogen-Doped Carbon Dots for Picric Acid Detection: Molecular Fluorescence Quenching Mechanism

Mahto

Samanta

Shaw

et al. 2023

ACS Appl. Nano Mater.

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We report a molecular fluorophore-based concept for the first time, to explain the quenching mechanism of the blue-emissive N-doped carbon dots (NCDs) exhibiting molecular fluorescence (quantum yield = 37%), synthesized through microwave-assisted pyrolysis of malic acid and urea (in 1:3 mole ratio), which has been devised as a fluorescent probe for the sensitive and selective detection of picric acid (PA). A linear Stern–Volmer plot for the fluorescence quenching of NCDs in the PA detection has been observed in the concentration range of 0–1.6 μM, and the limit of detection (LOD) is found to be 33 nM (7.56 ppb). Furthermore, molecular fluorescence in NCDs has been realized to originate from a putative pyridinic (2-pyridone moiety)-type molecular fluorophore, which has been manifested by the inferences drawn from HRMS, 1H NMR, 13C NMR, and XPS studies. The chemical structure of the molecular fluorophore was further validated by correlating the simulated absorption and emission spectra of the molecular fluorophore generated by TD-DFT, with those obtained from NCDs’ experimental data. The underlying photophysical property involved in the simultaneous occurrence of FRET and ET quenching mechanism has been illustrated based on the molecular fluorophore, along with the conventional approach. Here, the role of the molecular fluorophore in the NCDs has been demonstrated as a donor in the ET process involving the NCDs–nitroaromatics pair, where the acid–base interaction between the acceptor (nitroaromatics) and donor has been considered as the essence of the ET process.

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Section: Resultsmentioning

confidence: 99%

Section: Detection Of Pamentioning

confidence: 99%

Blue-Emissive Nitrogen-Doped Carbon Dots for Picric Acid Detection: Molecular Fluorescence Quenching Mechanism

Mahto

Samanta

Shaw

et al. 2023

ACS Appl. Nano Mater.

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“…Zeta potential measurements provide a means to validate the dispersibility of nanoparticles and polymer composites [55] . The stability and surface charge of the aqueous dispersions of carbon@polymer samples were investigated by measuring their zeta potentials.…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanofiber and Poly[2‐(methacryloyloxy) ethyl] Trimethylammonium Chloride Composite as a New Benchmark Carbon‐based Electrocatalyst for Sulfide Oxidation

Aziz

Shah

Mazumder

et al. 2021

Chemistry An Asian Journal

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There is an overwhelming desire to develop new sulfide oxidation electrocatalysts that perform at low potentials and exhibit high current density for the removal and efficient sensing of sulfide. This article describes a comparative electrochemical analysis of various commercially available carbon materials and polymer/surfactant composite electrocatalysts for direct electrooxidation of sulfide in an aqueous solution. The composites were prepared from five different carbon materials multiwalled carbon nanotubes, fullerene‐C60, graphene, glassy carbon, and carbon nanofibers (CNF) and four different polymers: chitosan, polyvinylidene fluoride, Nafion, and indigenously synthesized poly[2‐(methacryloyloxy)ethyl] trimethylammonium chloride (PMTC). The carbon@polymer composites were prepared by a simple ultrasonication technique, and the electrodes were prepared by drop‐drying the prepared composite on indium tin oxide (ITO) substrates. The CNF@PMTC showed the highest positive zeta potential that allowed an accumulation of many negatively charged sulfide ions at the CNF@PMTC surface. Cyclic voltammetry was used for the electrooxidation of sulfide in an aqueous solution of tris buffer (0.05 M; pH 8.0) and KNO3 (0.1 M). The lowest sulfide oxidation peak potential (i. e., −51 mV vs. standard hydrogen electrode) with a high catalytic current response (730 μA/cm2) of the CNF@PMTC‐modified ITO electrode among the tested and previously reported carbon‐based electrode materials make it ideal for direct sulfide electrooxidation. Taking this and its simple preparation method into account, CNF@PMTC can be considered a benchmark carbon‐based electrocatalyst for sulfide oxidation.

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“…In these contacts, the NCPA-templated AgNCs were used as fluorescent probes for the sensing of sulfide (S 2– ) ions. Among the various anions, the S 2– ion is one of the environmentally important toxins that are released as side products of several human industrial activities, such as tanneries, cosmetics, petroleum and coal industries, pulp manufacturing and food processing plants. − The discharge of S 2– ions beyond the pollution limits affect the ecological environment and pollute the groundwater leading to various diseases such as Alzheimer’s, Down’s syndrome, diabetes, and liver cirrhosis. , Recently, fluorescent MNCs have been used as a probe material for the sensing of sulfide ions. − Literature reports showing that red and NIR emitting noble-metal NCs are extensively used as potential fluorescent probes for bioimaging applications, because of their distinct advantages, such as reduced auto fluorescence background, penetration depth in vivo, with reduced damage to tissue cells and higher resolution. , Since the synthesized red-emitting NCPA-templated AgNCs possess good water solubility, high photostability, and a large Stokes shift, here we have demonstrated the cellular and molecular level of toxicity and live bioimaging studies using zebrafish ( Danio rerio ) as an in vivo vertebrate model system. Zebrafish has played a growing role in scientific research in the last few decades.…”

Section: Introductionmentioning

confidence: 99%

N-Cholyl d-Penicilamine Micelles Templated Red Light-Emitting Silver Nanoclusters: Fluorometric Sensor for S^2– Ions and Bioimaging Application Using Zebrafish Model

et al. 2022

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Red-light-emitting silver nanoclusters (AgNCs) are recently emerged as a promising nanoprobe in the field of biomedical applications, because of their attractive properties, including brightness, luminescence stability, and better biocompatibility. In this report, we have developed highly water-soluble redlight-emitting AgNCs by using N-cholyl D-penicilamine (NCPA) as a biosurfactant at above the critical micelle concentration (CMC) at room temperature. Moreover, the NCPA was initially synthesized by demonstrating the reaction between cholic acid and D-penicilamine via a simple coupling reaction strategy. The primary and secondary critical micellar concentration (CMC) of NCPA surfactant was measured using pyrene (1 × 10 −6 M) as a fluorescent probe, and the values were found to be 3.18 and 10.6 mM, respectively. Steady-state fluorescence measurements reveal that the prepared AgNCs shows the excitation and emission maxima at 365 and 672 nm, respectively, with a large Stokes shift (307 nm). The average lifetime measurements and quantum yield of the AgNCs were calculated to be 143.43 ns and 16.34%, respectively. Also, the red luminescent NCPA-templated AgNCs was synthesized in various protic and aprotic polar solvents, among which DMF and DMSO exhibit bright emission at longer wavelength as synthesized in aqueous medium. At higher concentration of AgNO 3 , bright luminescent and highly stable solid AgNCs was obtained with excitation and emission maxima at 607 and 711 nm, respectively. Furthermore, the synthesized AgNCs has been successfully utilized as a fluorescent probe for selective and sensitive detection of S 2− ions at nanomolar level in water samples, showing its potential applicability for the detection of S 2− ions in drinking, river, and tap water samples. Finally, toxicity and bioimaging studies of NCPA-templated AgNCs was demonstrated using zebrafish as in vivo model, showing no significant toxicity up to 200 μL/mL. The AgNCs-stained embryos exhibited red fluorescence with high intensity, which shows that AgNCs are stable in a living system.

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Sensitive detection of auric and sulphide ions using hybrid silver/nitrogen-doped carbon nanoparticles

Cited by 10 publications

References 68 publications

Blue-Emissive Nitrogen-Doped Carbon Dots for Picric Acid Detection: Molecular Fluorescence Quenching Mechanism

Blue-Emissive Nitrogen-Doped Carbon Dots for Picric Acid Detection: Molecular Fluorescence Quenching Mechanism

Carbon Nanofiber and Poly[2‐(methacryloyloxy) ethyl] Trimethylammonium Chloride Composite as a New Benchmark Carbon‐based Electrocatalyst for Sulfide Oxidation

N-Cholyl d-Penicilamine Micelles Templated Red Light-Emitting Silver Nanoclusters: Fluorometric Sensor for S^2– Ions and Bioimaging Application Using Zebrafish Model

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Sensitive detection of auric and sulphide ions using hybrid silver/nitrogen-doped carbon nanoparticles

Cited by 10 publications

References 68 publications

Blue-Emissive Nitrogen-Doped Carbon Dots for Picric Acid Detection: Molecular Fluorescence Quenching Mechanism

Blue-Emissive Nitrogen-Doped Carbon Dots for Picric Acid Detection: Molecular Fluorescence Quenching Mechanism

Carbon Nanofiber and Poly[2‐(methacryloyloxy) ethyl] Trimethylammonium Chloride Composite as a New Benchmark Carbon‐based Electrocatalyst for Sulfide Oxidation

N-Cholyl d-Penicilamine Micelles Templated Red Light-Emitting Silver Nanoclusters: Fluorometric Sensor for S2– Ions and Bioimaging Application Using Zebrafish Model

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Product

Resources

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N-Cholyl d-Penicilamine Micelles Templated Red Light-Emitting Silver Nanoclusters: Fluorometric Sensor for S^2– Ions and Bioimaging Application Using Zebrafish Model