Temperature-dependent AC conductivity and dielectric and impedance properties of ternary In–Te–Se nanocomposite thin films

2022

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.

“…Dielectric loss tangent (tan δ ) of samples was estimated using real (

ε^{'})

and imaginary

(ε^{''})

parts of the dielectric permittivity using the equation: 42

\tan δ = \frac{ε^{''}}{ε^{'}}

Section: Resultsmentioning

confidence: 99%

Section: Dielectric Loss Tangentmentioning

confidence: 97%

Section: Dielectric Constantmentioning

confidence: 99%

Section: Dielectric Loss Tangentmentioning

confidence: 99%

Section: Gas Sensing Studiesmentioning

confidence: 99%

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

Furhan

2022

Structure, properties, and antibacterial behavior of nickel oxide reinforced natural rubber nanocomposites for flexible electronic applications

Parvathi

2022

In this work, different contents of nickel oxide (NiO) nanoparticles were inserted into natural rubber (NR) using an industrial compounding technique to improve its process ability, mechanical, thermal stability, conductivity, dielectric constant, antibacterial and optical properties. The Fourier transform infrared spectra of composites showed the characteristic band of NiO at 495 cm À1 indicating the presence of nanoparticles in NR. The insertion of NiO into rubber showed a decrease in bandgap energy than pure NR. The crystalline peaks of nanoparticles in the rubber matrix were confirmed through X-ray diffraction pattern. The nano size distribution and surface morphology from HR-TEM and FE-SEM showed that the nanoparticles were uniformly dis-

Effect of titanium dioxide on the structural, thermal, and electrical properties of chlorinated natural rubber/poly (indole) blend nanocomposites for flexible nanoelectronic devices

Parvathi

2023

The synthesis of highly flexible conductive rubber blend nanocomposites using a conductive polymer with metal oxide is a new and promising approach. In this work, the effect of titanium dioxide (TiO 2 ) on the performance of chlorinated natural rubber/polyindole (Cl-NR/PIN) blend nanocomposites was systematically studied. Fourier-transform infrared spectra revealed the successful incorporation of nanoparticles in the blend system. UV analysis assessed the increased absorption spectra of the nanocomposite compared to the pure blend. The X-ray diffraction confirms the presence of TiO 2 nanostructure in the blend. The high resolution transmission electron microscope results exhibited the uniform dispersion of TiO 2 in the blend. Differential scanning calorimetry and thermogravimetric analysis show the increased glass transition temperature and thermal stability of the blend nanocomposite with an increase in TiO 2 concentration. The linear low-frequency AC conductivity demonstrated the occurrence of electrode polarization and the exponential increase in AC conductivity after a threshold frequency illustrated the semiconducting behavior of the composites. The maximum dielectric constant and AC conductivity were measured for the composite with 5 wt% filler loading, as the threshold level for the maximum interfacial contact. The hopping conduction, activation energy, improved conductivity and dielectric properties suggest that these blend nanocomposite films are promising candidates for the development of flexible energy storage devices.chlorinated natural rubber/polyindole blend, dielectric parameters, nanocomposites, temperature dependent conductivity, thermal properties, titanium dioxide | INTRODUCTIONConducting polymers are of great interest due to their diverse applications such as rechargeable batteries, modified electrodes, biosensors, electrochromic displays, and primer layers that prevent corrosion. [1][2][3] The nitrogencontaining heteroaromatic polymer has several intriguing properties, but the main barrier is its poor mechanical stability, brittleness and low processability. Polyindole (PIN) films are often particularly rigid, brittle, insoluble,