Influence of medium on structure, morphology and electrochemical properties of polydiphenylamine/vanadium pentoxide composite

Khatoon, Halima; Iqbal, Sajid; Ahmad, Sharif

doi:10.1007/s42452-019-0285-y

Cited by 6 publications

(6 citation statements)

References 41 publications

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“…Conjugated polymers (CPs) are a particular category of macromolecules with highly polar structure and conjugated backbone, which are gaining more academic interest as the dielectric materials. The CPs have comparatively higher dielectric constant than that of common thermoplastic or thermosetting polymers owing to their highly polarizable conjugated backbone [32][33][34][35]. By using CPs as the polymer matrix for dispersing nanomaterials, the dielectric properties of the individual components can be integrated effectively.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and dielectric studies of poly(1-naphthylamine)–tungsten disulphide nanocomposites

Saidu

Thomas

2020

SN Appl. Sci.

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Here, novel poly(1-naphthylamine)-tungsten disulphide (PNA-WS 2 ) nanocomposites were synthesized through an in-situ chemical oxidative polymerization of 1-naphthylamine in the presence of ultrasonically dispersed WS 2 . The effect of WS 2 addition on the optoelectrical, morphological and thermal properties of PNA was studied by using different analytical tools. SEM images revealed that PNA aggregates are well supported on the dispersed WS 2 sheets. The formation of a fibrous network of PNA over the dispersed WS 2 layers evidenced from the TEM images has suggested larger surface area and better interfacial interaction between PNA and incorporated WS 2 layers . The thermal stability was improved upon the incorporation of WS 2 . Optical bandgap values of PNA-WS 2 nanocomposites were lower than that of bulk WS 2 and pristine PNA. Electrical and dielectric studies have confirmed an improvement in conductivity and dielectric properties with increasing WS 2 content, which was credited to the better charge transport between the polar backbone of PNA and charged surface of dispersed WS 2 due to enhanced interfacial area and electrostatic interactions between the components. A maximum AC conductivity of 4.4 × 10 -3 Sm −1 was displayed by nanocomposite containing 20% WS 2 loading and a further increase in WS 2 content showed a detrimental effect in electrical and dielectric properties. The present study has demonstrated that optical and dielectric properties of composites can be readily tuned by proper control of the composition and dispersion of WS 2 within the PNA matrix.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and dielectric studies of poly(1-naphthylamine)–tungsten disulphide nanocomposites

Saidu

Thomas

2020

SN Appl. Sci.

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“…The third degradation, at around 558 C corresponds to the degradation of the remaining polymer backbone. 6,24,36 The TGA and DTG thermograms of PDPA/ZnO nanocomposites show similar behavior to that of PDPA with a difference in degradation temperatures and mass loss. All nanocomposites exhibit a slower thermal degradation rate than the parent polymer.…”

Section: Tg Analysismentioning

confidence: 84%

“…This corresponds to the second degradation step (354°C) with a weight loss of 40%. The third degradation, at around 558°C corresponds to the degradation of the remaining polymer backbone 6,24,36 …”

Section: Resultsmentioning

confidence: 99%

Enhanced dielectric properties, thermal stability and ammonia sensing performance of poly(diphenylamine)/zinc oxide nanocomposites via one step polymerization

Furhan

Ramesan

2022

J of Applied Polymer Sci

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The structural, morphological, thermal, dielectric and electrical conductivity properties of poly(diphenylamine) (PDPA)/zinc oxide (ZnO) nanocomposites, synthesized by in‐situ chemical polymerization technique, were systematically evaluated and characterized. The ammonia (NH3) gas sensing characteristics of composites were evaluated as a function of ZnO nanoparticle concentration. The Fourier transform infrared (FTIR) spectra of composites showed the characteristic band of ZnO nanoparticles at 418 cm−1 indicating an effective interaction between the polymer matrix and filler. The X‐ray diffraction (XRD) studies confirm the increased crystallinity in the PDPA structure when ZnO is incorporated. The uniform distribution of nanoparticles within the polymer matrix is confirmed by transmission electron microscopy (TEM) images. The differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) studies emphasize the shift in glass transition temperatures and enhanced thermal stability of composites relative to bare PDPA, which is further confirmed by the Coat‐Redfern method. Conductivity studies show a significant increase in magnitudes of real part of dielectric permittivity and dielectric loss tangent concerning filler content. The addition of 7 wt% ZnO nanoparticles to PDPA increases the room temperature AC conductivity from 1.058 × 10−5 to 7.8 × 10−4 S/cm. Moreover, the room‐temperature NH3 gas sensing property of PDPA/ZnO nanocomposites was accelerated by the addition of ZnO nanoparticles.

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“…24,25 Figure 1B represents the polymer modified pencil graphite electrode and it has been understood that the exterior of the flake like structures of the unmodified pencil graphite has been deposited with granular shaped PDPA formed due to the electropolymerization of DPA monomer. 26 The images indicated that the bare PGE has undergone a surface modification process.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Resolution and Electrochemical Quantification of Tyrosine and Tryptophan at a Poly (Diphenylamine) Modified Electrode

Krishnan

Saraswathyamma

2021

J. Electrochem. Soc.

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Polydiphenylamine modified pencil graphite was fabricated for the simultaneous electrochemical determination of tyrosine and tryptophan. Both tyrosine and tryptophan underwent an irreversible electroxidation at the modified electrode surface in phosphate buffer pH 9. These amino acids generally exhibit proximities in their oxidation overpotential, overlapping oxidation signals and interferences from other co-existing biomolecules. These points have been addressed using the developed electrode. The sensor has been characterized morphologically and electrochemically. The kinetic parameters such as charge transfer coefficient and the heterogeneous rate constant at the modified electrode surface were estimated using cyclic voltammetry. Differential pulse voltammetry was employed to quantify both tyrosine and tryptophan simultaneously with good sensitivity and high selectivity. A wide linearity of 20 μM–1 mM and 20 μM–1.4 mM was obtained using the sensor for tyrosine and tryptophan respectively. Practical utility of the developed sensor was tested in real human serum samples and obtained satisfactory recovery percentage.

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Influence of medium on structure, morphology and electrochemical properties of polydiphenylamine/vanadium pentoxide composite

Cited by 6 publications

References 41 publications

Synthesis, characterization and dielectric studies of poly(1-naphthylamine)–tungsten disulphide nanocomposites

Synthesis, characterization and dielectric studies of poly(1-naphthylamine)–tungsten disulphide nanocomposites

Enhanced dielectric properties, thermal stability and ammonia sensing performance of poly(diphenylamine)/zinc oxide nanocomposites via one step polymerization

Simultaneous Resolution and Electrochemical Quantification of Tyrosine and Tryptophan at a Poly (Diphenylamine) Modified Electrode

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