Impedance Spectroscopy Study of a Polymer Composite with Carbon Nanotubes in Contact with an Electrolyte

Markevich, I. A.; Drokin, N. A.; Selyutin, G. E.

doi:10.1134/s1063784219090093

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…With the increase in temperature and frequency, the maximum height of the impedance diminishes. It demonstrates that the impedance falls while increasing the polarons′ mobility [85] …”

Section: Resultsmentioning

confidence: 92%

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag⁺ Ion Detection and Their Theoretical Investigations.

et al. 2023

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A novel azine monomer and its oligomeric esters were synthesized and applied to chemosensor applications. Among the series of metal ions, the fluorophores show selective and sensitive “turn off” response towards Ag+ ions. The stoichiometry and binding constant are calculated using the Stern‐Volmer equation and Benesi‐Hildebrand plots, respectively. The fluorophore‘s capability for quantitative analysis of Ag+ ions was studied. The quenching mechanism LMCT and PET behind the “turn off” response was confirmed. The conductivity nature of iodine doped and undoped oligoesters was studied. The dielectric behaviour of oligoesters was also studied to determine the possibility of oligoesters in making passive components such as capacitors and resistors. All the results obtained from chemosensor and electrical studies were validated using a theoretical (DFT) analysis using B3LYP/6–311++G(d,p) level basis set.

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“…With the increase in temperature and frequency, the maximum height of the impedance diminishes. It demonstrates that the impedance falls while increasing the polarons′ mobility [85] …”

Section: Resultsmentioning

confidence: 92%

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag⁺ Ion Detection and Their Theoretical Investigations.

et al. 2023

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“…The maximum height of the impedance decreases as temperature and frequency rise. It demonstrates how the impedance decreases while the mobility of the polarons rises [77]…”

Section: Impedance Studymentioning

confidence: 94%

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe²⁺ ion detection

et al. 2023

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Azine‐based monomer and its three oligoesters were synthesized, characterized with IR, UV, GC‐MS, GPC, 1H NMR, 13C{1H} NMR, 31P NMR and applied to chemosensor applications. In the chemosensor study, fluorophores show selective and sensitive responses with Fe2+ ions in the DMF/H2O solution (1 : 1, pH: 7.4, fluorophore: 5 μM). The quenching of fluorescence intensity with the addition of Fe2+ ion gives the correlation coefficient (R2) value above 0.99286, exhibiting good binding stoichiometry nature of fluorophores with Fe2+ than the oligoesters. The high detecting capability of oligoesters is further ascertained by its higher LOD than the monomer (5.05×10−7). The binding constant values of fluorophores obtained from the Benesi‐Hildebrand plot show that the oligoesters have a higher binding ability (1.0012–1.0025 M−1) with Fe2+ ion than the monomer (1.0011 M−1). The conductivity nature of the oligoester gradually increased with the contact time of iodine. After 96hr of iodine doping, EMDAP exhibits higher conductivity (1.98×10−3 Scm−1) than the other oligoesters due to higher electron‐density nitrogen atoms in the structure. The EMDOP shows high dielectric constant value because of its π‐π interaction, loosely attached π electrons and high dipole moment values. All these experimental results are validated with the theoretical (DFT) approach by optimizing the structure of the fluorophore with B3LYP/6‐311++G(d,p) level basis set. The DFT approach also explains the mechanism of fluorescence quenching and the exact binding sites of fluorophores with Fe2+ ions.

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“…Measuring the impedance of porous electrodes is a powerful tool for the design and characterization of electrodes, is widely used in practice, and can be studied by the equivalent circuit method [19]. Impedance models for porous electrodes can be divided into two types: 1) modeling of the hierarchical structure of pores, consisting of a multilevel system of charge accumulation and storage [20];…”

Section: Introductionmentioning

confidence: 99%

“…In our paper, we assume that silicon-carbon electrodes have a hierarchical structure of pores of two types: transport pores and storage pores [20].…”

Section: Introductionmentioning

confidence: 99%

Study of functional characteristics of mesoporous electrodes of supercapacitors based on silicon-carbon films

2022

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The study of the supercapacitor electrodes based on silicon-carbon films obtained by electrochemical deposition from solutions with different ratios of methanol/hexamethyldisilane and addition of manganese and nickel salts was carried out using cyclic voltammetry, electrochemical impedance spectroscopy and impedance Nyquist plots simulation by equivalent circuits method. The predominance of mesopores in the electrode samples was confirmed by the functional density method. According to a scanning electron microscopy study, the surface morphology of the silicon-carbon films is highly developed due to the presence of three-dimensional agglomerates and "foliated" structures. The best retention of specific capacity after 450 charge/discharge cycles is observed for electrode samples containing manganese and nickel. Simulation of equivalent circuits showed that all types of electrodes have hierarchical pore structure. Ffter 450 charge/discharge cycles an increase in pore storage resistance and a decrease in transport pore resistance due to the activation of deeper pore levels is observed. The applicability of Peukert's law for the electrodes based on silicon-carbon films for prediction of electrode discharge time is shown. Keywords: Porous electrodes, silicon-carbon films, electrochemical impedance spectroscopy, equivalent circuit models, Peukert's law.

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Impedance Spectroscopy Study of a Polymer Composite with Carbon Nanotubes in Contact with an Electrolyte

Cited by 9 publications

References 13 publications

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag⁺ Ion Detection and Their Theoretical Investigations.

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag⁺ Ion Detection and Their Theoretical Investigations.

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe²⁺ ion detection

Study of functional characteristics of mesoporous electrodes of supercapacitors based on silicon-carbon films

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Impedance Spectroscopy Study of a Polymer Composite with Carbon Nanotubes in Contact with an Electrolyte

Cited by 9 publications

References 13 publications

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag+ Ion Detection and Their Theoretical Investigations.

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag+ Ion Detection and Their Theoretical Investigations.

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe2+ ion detection

Study of functional characteristics of mesoporous electrodes of supercapacitors based on silicon-carbon films

Contact Info

Product

Resources

About

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag⁺ Ion Detection and Their Theoretical Investigations.

Synthesis and Structural Characterization of Azine Based Chemosensors for Ag⁺ Ion Detection and Their Theoretical Investigations.

Synthesis and structural characterization of azine based oligoesteric chemosensors for Fe²⁺ ion detection