Amperometric sensing of catechol by using a nanocomposite prepared from Ag/Ag2O nanoparticles and N,S-doped carbon quantum dots

Zhan, Tianrong; Ding, Guiyan; Cao, Wei; Li, Jiamin; She, Xilin; Teng, Hongni

doi:10.1007/s00604-019-3848-0

Cited by 13 publications

(4 citation statements)

References 33 publications

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“…Figure 3 c confirms the oxidation of the silver nanoparticles through the existence of the O1 s spectrum at 529.39 eV with an atomic ratio of 47.64%, at 530.77 eV with an atomic ratio of 25.32% and at 531.4 eV with an atomic ratio of 23.19%. Finally, the results confirm that there are two different configurations of silver species, namely Ag 2 O and Ag, which is consistent with many published reports 26 – 28 . The detected elemental carbon in the main survey analysis may have originated from the ambient atmosphere itself.…”

Section: Resultssupporting

confidence: 92%

One-pot fabrication of Ag @Ag2O core–shell nanostructures for biosafe antimicrobial and antibiofilm applications

Elyamny

Eltarahony

Abu‐Serie

et al. 2021

Sci Rep

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Microbial contamination is one of the major dreadful problems that raises hospitalization, morbidity and mortality rates globally, which subsequently obstructs socio-economic progress. The continuous misuse and overutilization of antibiotics participate mainly in the emergence of microbial resistance. To circumvent such a multidrug-resistance phenomenon, well-defined nanocomposite structures have recently been employed. In the current study, a facile, novel and cost-effective approach was applied to synthesize Ag@Ag2O core–shell nanocomposites (NCs) via chemical method. Several techniques were used to determine the structural, morphological, and optical characteristics of the as-prepared NCs. XRD, Raman, FTIR, XPS and SAED analysis revealed a crystalline hybrid structure of Ag core and Ag2O shell. Besides, SEM and HRTEM micrographs depicted spherical nanoparticles with size range of 19–60 nm. Additionally, zeta potential and fluorescence spectra illustrated aggregated nature of Ag@Ag2O NCs by − 5.34 mV with fluorescence emission peak at 498 nm. Ag@Ag2O NCs exhibited higher antimicrobial, antibiofilm, and algicidal activity in dose-dependent behavior. Interestingly, a remarkable mycocidal potency by 50 μg of Ag@Ag2O NCs against Candida albican; implying promising activity against COVID-19 white fungal post-infections. Through assessing cytotoxicity, Ag@Ag2O NCs exhibited higher safety against Vero cells than bulk silver nitrate by more than 100-fold.

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Section: Resultssupporting

confidence: 92%

One-pot fabrication of Ag @Ag2O core–shell nanostructures for biosafe antimicrobial and antibiofilm applications

Elyamny

Eltarahony

Abu‐Serie

et al. 2021

Sci Rep

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“…It is noteworthy that the shift of Ag 3d XPS peaks toward lower binding energy suggests higher valence states for the Ag cations according to many studies in the literature. [30][31][32][33] Therefore, the XPS results indicate that the electron density of Ag in Ag(S)@NiO/NF and Ag@NiO/NF becomes lower due to the interface formation between Ag and NiO. In contrast, for Ag 2 O, the peak around 367.6 eV can be attributed to Ag + 3d 5/2 , which is at a lower binding energy than those for Ag(S)@NiO/NF and Ag@NiO/NF, suggesting that the electrons loss of Ag for Ag(S)@NiO/NF and Ag@NiO/NF is not due to oxidation of Ag.…”

Section: Synthesis and Physicochemical Characterization Of Ag(s)@nio/nfmentioning

confidence: 99%

A Strongly Coupled Ag(S)@NiO/Nickel Foam Electrode Induced by Laser Direct Writing for Hydrogen Evolution at Ultrahigh Current Densities with Long‐Term Durability

Zhang

et al. 2023

Small Methods

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Highly active, durable, and cost‐effective electrodes for hydrogen evolution reaction (HER) at ultrahigh current densities (≥1 A cm−2) are extremely demanded for industrial high‐rate hydrogen production, but challenging. Here, a robust strongly coupled Ag(S)@NiO/nickel foam (NF) electrode is reported. Taking advantage of millisecond laser direct writing in liquid nitrogen technique, lattice‐matched and coherent interfaces are formed between Ag nanoparticles with stacking faults (denoted by Ag(S)) and NiO nanosheets, leading to strong interfacial electronic coupling, not only promoting H2O adsorption and dissociation on Ni2+ but also enhancing H* adsorption on intrinsically inactive but most electrically conductive Ag. Strong chemical bonding is established at NiO/NF interface, guaranteeing rapid electron transfer and excellent mechanical durability under high‐rate hydrogen evolution. The physicochemically stable electrode achieves record‐low alkaline HER overpotential of 167 and 180 mV at 1 and 1.5 A cm−2, respectively, along with negligible activity decay after 120 h test at ≈1.5 A cm−2, surpassing reported non‐platinum group metal electrocatalysts.

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“…One aptamer S-18 (recognition element) was introduced to combine with AuNPs to effectively quench the fluorescent of CQDs to achieve the detection of target (LOD: 1.08 µg L −1 ), which provides a new idea for the construction of specific and functionalized fluorescent sensors. An electrochemical sensing platform was constructed using the composite of Ag/Ag 2 O@NS-CQDs for the detection of catechol, achieving a low LOD of 13 nmol L −1 [122]. It has demonstrated that the Ag/Ag 2 O@NS-CQDs composite has better conductivity, specific surface area and electrocatalytic ability than that of NS-CQDs and its participation greatly increases the electrochemical activity on the sensing interface, which has a remarkable guiding significance for the construction of various electrochemical sensors with excellent performance.…”

Section: Pesticide and Veterinary Drug Residuesmentioning

confidence: 99%

Fluorescent Carbon Quantum Dots—Synthesis, Functionalization and Sensing Application in Food Analysis

et al. 2020

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Carbon quantum dots (CQDs) with stable physicochemical properties are one of the emerging carbon nanomaterials that have been studied in recent years. In addition to the excellent optical properties such as photoluminescence, photobleaching resistance and light stability, this material also has favorable advantages of good biocompatibility and easy functionalization, which make it an ideal raw material for constructing sensing equipment. In addition, CQDs can combined with other kinds of materials to form the nanostructured composites with unique properties, which provides new insights and ideas for the research of many fields. In the field of food analysis, emerging CQDs have been deeply studied in food composition analysis, detection and monitoring trace harmful substances and made remarkable research progress. This article introduces and compares the various methods for CQDs preparation and reviews its related sensing applications as a new material in food components analysis and food safety inspection in recent years. It is expected to provide a significant guidance for the further study of CQDs in the field of food analysis and detection.

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Amperometric sensing of catechol by using a nanocomposite prepared from Ag/Ag2O nanoparticles and N,S-doped carbon quantum dots

Cited by 13 publications

References 33 publications

One-pot fabrication of Ag @Ag2O core–shell nanostructures for biosafe antimicrobial and antibiofilm applications

One-pot fabrication of Ag @Ag2O core–shell nanostructures for biosafe antimicrobial and antibiofilm applications

A Strongly Coupled Ag(S)@NiO/Nickel Foam Electrode Induced by Laser Direct Writing for Hydrogen Evolution at Ultrahigh Current Densities with Long‐Term Durability

Fluorescent Carbon Quantum Dots—Synthesis, Functionalization and Sensing Application in Food Analysis

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