Influence of cadmium sulfide nanoparticles on structural and electrical properties of polyvinyl alcohol films

Koteswararao, J.; Abhishek, Rockey; Satyanarayana, S.; Madhu, G. M.; Venkatesham, V.

doi:10.3144/expresspolymlett.2016.83

Cited by 30 publications

(20 citation statements)

References 34 publications

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“…Also the obstruction caused to the charge carriers due to broad interface and large granular separation between the two phases may be the reason for low conductivity in other composites. Overall, the frequency dependent conductivity, dielectric properties, and relaxation mechanism reported based on nyquist plots and quality factor shows better results than the reports availbale in literature on these composites .…”

Section: Resultsmentioning

confidence: 55%

Investigations on structural and electrical properties of polyaniline–cadmium sulfide nanocomposite films for solid state electronics

Khasim

Lakshmi²,

Johani

et al. 2018

Polymer Composites

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Conducting polyaniline (PANI)/cadmium sulfide (CdS) nanocomposite films were prepared by in situ chemical oxidation method. The prepared nanocomposites were characterized by fourier transform infra‐red spectroscopy, X‐ray diffraction, and scanning electron microscopy for structural and morphological analysis. The effect of CdS content on structural and morphological features of PANI matrix are discussed in detail. The frequency dependent room temperature conductivity and dielectric properties of these composites were studied by measuring various parameters in the frequency range 10–106 Hz. The role of surface modification on electrical and dielectric properties of the composites was analyzed and it was found that, the concentration of CdS in PANI matrix has a greater influence on electrical properties due to the alteration of molecular chains in PANI matrix. Among various nanocomposites so prepared, the composite with 3 wt% of CdS in PANI matrix (P3) shows better conductivity and dielectric behavior which could be of great importance in various technological applications. The possibility of these materials being used as transistors, energy storage and nano dielectric devices could be explored further. POLYM. COMPOS., 40:E579–E588, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 55%

Investigations on structural and electrical properties of polyaniline–cadmium sulfide nanocomposite films for solid state electronics

Khasim

Lakshmi²,

Johani

et al. 2018

Polymer Composites

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“…At higher frequencies (10 KHz-20 MHz), no significant change in dielectric constant was observed which demonstrating the good frequency stability of samples. Generally, it happens because the dipole orientation is difficult at the higher frequencies [53]. The maximum dielectric constant value was found to be 154.55 (at 50 Hz and at140°C) for PVA/NiS nanocomposite films reinforced with 3 wt% NiS NPs which is 22 times greater than the dielectric constant value of pure PVA (6.90).…”

Section: Dielectric Studiesmentioning

confidence: 91%

“…The XRD patterns of pure PVA and PVA/NiS nanocomposite films are represented in figure 4. Figure 4(a) depicts a diffraction peak around 2θ=19.67°which is ascribed to the semi-crystalline nature of neat PVA ascribing to (101) plane reflections [52][53][54][55][56][57]. The PVA/NiS nanocomposites (figures 4(b)-(g)) also show the broad diffraction peak at 2θ=19.82°representing the existence of PVA with several additional small peaks at 2θ=30.38°, 35.11°, 45.99°and 54.09°which strongly corroborate the existence of NiS in the nanocomposites.…”

Section: Xrd Analysismentioning

confidence: 99%

“…Also, the chain interactions and the polarity of the host polymer may affect the interface between the polymer matrix and the NPs defined as the accumulation of charge carriers at the interface between the polymer matrix and the nanofiller [84,85]. At higher frequency, the interfacial dipoles do not have enough time to align themselves in the direction of an applied electric field [53,86,87]. Also, the MWS effect in polarization is typified by the dependence of frequency and the value of ε in the low-frequency region.…”

Section: Dielectric Studiesmentioning

confidence: 99%

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Enhanced dielectric properties of green synthesized Nickel Sulphide (NiS) nanoparticles integrated polyvinylalcohol nanocomposites*

Reddy

Deshmukh

Kovařík

et al. 2020

Mater. Res. Express

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A green synthesis approach has been adopted to prepare nickel sulphide nanoparticles (NiS NPs) using banana peel extract (BPE) as a reducing and capping agent. Polyvinyl alcohol (PVA)/NiS nanocomposite films were fabricated using a cost-effective solution casting technique by dispersing different contents of NiS NPs (0-3 wt%) in the PVA matrix. Various characterization techniques were employed to analyze the structural, thermal and morphological properties of the PVA/NiS nanocomposite films. Further, the dielectric behaviour of these nanocomposite films was investigated at frequency range 50 Hz-20 MHz and in the temperature range 40°C-140°C. Also, there exists a significant interaction between the polymer matrix and the nanofiller as evident from the notable improvement in the dielectric properties of the nanocomposites. The dielectric constant (ε) value of PVA/NiS nanocomposite film with 3 wt % NiS NPs loading was found to be 154.55 at 50 Hz and at 140°C which is 22 times greater than the dielectric constant value of neat PVA (6.90). These results suggest that NiS NPs were dispersed homogeneously in the PVA matrix.Among various polymers used for the fabrication of PNCs, polyvinyl alcohol (PVA) is most often preferred as a host matrix owing to its excellent film-forming ability, higher dielectric strength, the capability to form strong hydrogen bonding, easy processability, excellent chemical stability, and highly durable nature [17]. PVA has been employed for various applications such as in battery components, packaging, textile applications in the microelectronic industry, electromagnetic interference applications and so on [17,18]. Several research groups reported the dielectric properties of the PVA based nanocomposites [19][20][21]. With this inspiration, in the present study PVA has been chosen as a host polymer to synthesize PVA based nanocomposites. Now a day, more attention has been focussed on metal sulphide nanostructures because of their unique properties and applications [22]. Among these, nickel sulphide (NiS) has been mostly investigated because of its simple production, affordable price and high electronic conductivity [23,24]. It exhibits complicated electrical, optical, structural, compositional and magnetic phase behaviour [25]. Also due to the possession of multi-phases, binary Ni-S systems such as NiS 2 , Ni 3 S 4 , Ni 9 S 8 , Ni 7 S 6 , Ni 6 S 5 , Ni 4 S 3+x , Ni 3 S 2 , and Ni 3+x S 2 have become fascinated materials [26]. NiS NPs exhibit different shapes such as layer-rolled structures, urchin-like nanocrystallites, flower-like architectures, hollow spheres, nanoframes, nanorods, and nanospheres etc [27,28].Recently, increased attention has been given to the green approach for the synthesis of NPs because of its several advantages [29][30][31][32]. For the synthesis of NPs, the plant extracts which serve as reducing/capping agents are considered to be more beneficial than remaining techniques [33]. Several researchers reported the synthesis of metal sulphide NPs through a green synthesis a...

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“…Polyvinyl alcohol (PVA) is a most preferred material of choice as a host matrix by various researchers [17][18][19][20][21][22] for the synthesis of polymer nanocomposites due its water soluble, non-toxic, ease of fabrication, transparent film forming ability, biodegradability, chemical stability and interesting mechanical properties. PVA is a semi-crystalline polymer with high optical clarity [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of ZTA concentration on structural, thermal, mechanical and dielectric behavior of novel ZTA–PVA nanocomposite films

Srikanth

Madhu

2020

SN Appl. Sci.

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Zirconia toughened alumina (ZTA) nanopowder was synthesized by solution combustion technique. Polymer nanocomposites were prepared using ZTA nanopowder as the reinforcement and polyvinyl alcohol (PVA) as the matrix. ZTA nanopowder composition was varied from 0 to 2.5% by weight. Structural characterization was done using scanning electron microscope (SEM) and X-ray diffraction (XRD). XRD results showed prominent, well defined peaks of zirconia and α-alumina, hence confirmed that ZTA is a crystalline material. SEM images showed that, level of agglomeration kept increasing due to increase in filler content, which might have contributed to film stiffness. Thermal analysis was carried out using differential scanning calorimetry. Addition of ZTA into PVA matrix resulted in increase in melting point as well as glass transition temperature. Influence of the nanofiller concentration on the electrical conductivity was found using Agilent 4249A impedance analyser. Conductivity measurements were carried out for all the nanocomposite films doped with ZTA and were found to exhibit insulating properties. Change in mechanical properties such as Young's modulus, tensile strength and film toughness of PVA films as a function of nano filler content are reported.

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Influence of cadmium sulfide nanoparticles on structural and electrical properties of polyvinyl alcohol films

Cited by 30 publications

References 34 publications

Investigations on structural and electrical properties of polyaniline–cadmium sulfide nanocomposite films for solid state electronics

Investigations on structural and electrical properties of polyaniline–cadmium sulfide nanocomposite films for solid state electronics

Enhanced dielectric properties of green synthesized Nickel Sulphide (NiS) nanoparticles integrated polyvinylalcohol nanocomposites*

Effect of ZTA concentration on structural, thermal, mechanical and dielectric behavior of novel ZTA–PVA nanocomposite films

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