Solution-processed white graphene-reinforced ferroelectric polymer nanocomposites with improved thermal conductivity and dielectric properties for electronic encapsulation

Deshmukh, Kalim; Ahamed, M. Basheer; Sadasivuni, Kishor Kumar; Ponnamma, Deepalekshmi; Deshmukh, Rajendra R.; Trimukhe, Ajinkya M.; Pasha, S. K. Khadheer; Polu, Anji Reddy; Al-Maadeed, Somaya; Chidambaram, K.

doi:10.1007/s10965-017-1189-4

Cited by 63 publications

(14 citation statements)

References 76 publications

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“…The potential increase in ε ′ with increase in temperature is mostly due to the redistribution of micro agglomeration of GO phase because of the increase in flexibility of the PVA molecular chains, which ultimately increases the charge carriers in the interface. [ 46 ] This pronounced interfacial polarization is the prime factor for the substantial improvement in ε ′ value at higher temperature. However, above 100°C, the enhancement in ε ′ is quite marginal and the values are almost overlapped on each other as observed in Figure 6C.…”

Section: Resultsmentioning

confidence: 99%

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

2020

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Fabrication of polymer nanocomposites with excellent dielectric properties in an environmentally friendly approach is a challenging job. Nanocomposites based on polyvinyl alcohol (PVA) and graphene oxide (GO) are fabricated using deionized water by solvent casting technique. The agglomerations, intercalation, and exfoliation pattern of dispersion of GO phase in the interface are observed in HRTEM and FESEM photomicrographs.1-Allyl-3-methyl imidazolium chloride (AMIC) as ionic liquid (IL) is incorporated for better dispersion and compatibility. The Fourier-transform infrared (FTIR) and Raman analysis confirms the establishment of hydrogen bonding and cation-π interaction between AMIC and GO platelets. The enhancement of the tensile results up to 2 wt% of GO loading ensures the reinforcing nature of GO. Further increase in tensile strength in IL contend systems ensure the bridging activity, which facilitates the stress transfer at the interface. The effect of GO loading, IL, and temperature on the dielectric properties, such as dielectric permittivity (ε 0), AC conductivity (σ ac), impedance (Z 0 and Z 00), and Nyquist plot are explored. The significant enhancement in ε 0 with the incorporation of GO loading level and IL in an external electric field is mostly due to the increase in polarizable dipoles and migration of electric charge carriers, which result the accumulation of charge particles with different relaxation time at the interface. The interfacial polarization phenomena become more frequent at higher temperature, which again results increase in ε 0. A remarkable increase in σ ac and reduction of Z 0 and Z 00 of the fabricated PVA/GO systems with an increase in GO loading level ensures the pronounced tunneling and hopping phenomenon at the interface. The diminished area obtained under the Nyquist plots with increase in GO loading level and temperature ensures about the decrease in bulk resistivity (R B) and increase in charge storing ability of the developed systems. The significant improvement in dielectric properties at higher temperature reveals the negative temperature coefficient behavior of resistance (NTC) of the developed systems.

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Section: Resultsmentioning

confidence: 99%

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

2020

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“…The increase in the dielectric loss with the increasing nanofiller content was attributed to the conductive network formation due to CBNPs in the polymer matrix. 49,50 It is worth mentioning that, dielectric loss also follows the same trend as that of dielectric constant, that is, maximum value for higher loading of CBNPs and gradual decrease with the increase in frequency. This may be attributed to the decrease in the dipole orientation which is responsible for the interfacial polarization.…”

Section: Dielectric Studiesmentioning

confidence: 71%

Dielectric and electromagnetic interference shielding properties of zeolite13Xand carbon black nanoparticles basedPVDFnanocomposites

Rani

Ahamed

Deshmukh

2020

J of Applied Polymer Sci

Self Cite

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In the present work, Zeolite 13X and carbon black nanoparticles (CBNPs) reinforced polyvinylidene fluoride (PVDF) nanocomposites were obtained by a simple solvent casting technique. The structural, morphological and thermal properties of PVDF/Zeolite 13X/CBNPs nanocomposites with various loadings of Zeolite 13X and CBNPs were investigated using Fourier-transform infrared spectroscopy, X-ray diffraction, Scanning electron microscopy and thermo-gravimetric analysis. The dielectric studies were carried out in the 50 Hz-10 MHz frequency range at room temperature. The electromagnetic interference (EMI) shielding effectiveness (SE) of PVDF/Zeolite 13X/CBNPs nanocomposite was investigated in the 8-18 GHz frequency region (X-band and Ku-band). The maximum EMI SE of approximately −11.1 dB (8-12 GHz) and −11.5 dB (12-18 GHz) was observed for PVDF/CBNPs nanocomposites with 10 wt% loading of CBNPs. These findings emphasize the application of PVDF/ Zeolite 13X/CBNPs nanocomposites as a potential EMI shielding material.

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“…But in pure CdO sample, no free charge carriers due to the ionic bond between Cd 2+ and O 2-. In general, the parameters such as particle size, synthesis conditions, structural defects, oxygen vacancies and high carrier concentration gives impact on variations in band gap value [21,26,14]. Finally this absorption studies concluded that synthesized CdO/La2O3 and CdO/ La2O3/PVP nanocomposites with tunable band gap is the suitable materials for optoelectronic and solar cell applications.…”

Section: Uv-vis Absorption Studiesmentioning

confidence: 75%

“…Advanced research in nanocomposites confirms that the carbon nanotubes with polylactic acid nanocomposites in 3-dimentional ink form produce more EMI SE than the nanocomposites in solid form [24]. Furthermore, the incorporation of polymer such as polyaniline (PANI), hexagonal boron nitride (HBN) and Polyvinylpyrrolidone (PVP) with nanocomposites enriches the optical, electronic, dielectric, magnetic, EMI SE, mechanical properties and thermal stability [25,26].…”

Section: Introductionmentioning

confidence: 99%

Efficient Photocatalytic and EMI Shielding Properties of CdO/ La2O3 Nanocomposites

S¹,

Srinivasan²,

Thangeeswari³

et al. 2021

Preprint

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The pure CdO and CdO/La 2 O 3 , and CdO/La 2 O 3 /PVP nanocomposites were synthesized by microwave irradiation method. The prepared samples are analyzed by X-Ray diffraction (XRD), Fourier Transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM), Transmission electron microscope (TEM), UV visible spectrometer, Photoluminescence (PL), and Vibrating sample magnetometer (VSM). XRD and FTIR studies confirmed the formation of binary metallic nanocomposites. SEM and TEM analysis authenticate that the addition of lanthanum oxide and PVP influences the size and morphology of CdO nanoparticles the bandgap value can be tuned by the addition of La 2 O 3 and PVP. Photoluminescence spectra show the violet emission in the region between 432 nm to 460 nm and the green emission peak at 529 nm for all three synthesized samples. CIE color coordinates for CdO and CdO/La 2 O 3 , and CdO/La 2 O 3 /PVP nanocomposites were also estimated from emission spectrum. The VSM results confirmed that the nanocomposites possess the weak ferromagnetic properties due to the inclusion of La 2 O 3 and PVP. The dielectric constant, electrical conductivity and dielectric loss values at room temperature have been analyzed for CdO and CdO/La 2 O 3 , and CdO/La 2 O 3 /PVP nanocomposites. Among the three synthesized samples, the CdO/La 2 O 3 /PVP nanocomposite attain high electromagnetic shielding efficiency. Furthermore, the rare earth element lanthanum oxide and PVP enhances the efficiency of photocatalytic degradation of MB dye.

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Solution-processed white graphene-reinforced ferroelectric polymer nanocomposites with improved thermal conductivity and dielectric properties for electronic encapsulation

Cited by 63 publications

References 76 publications

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

Dielectric and electromagnetic interference shielding properties of zeolite13Xand carbon black nanoparticles basedPVDFnanocomposites

Efficient Photocatalytic and EMI Shielding Properties of CdO/ La2O3 Nanocomposites

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