Tailoring of electrical, optical and structural properties of PVA by addition of Ag nanoparticles

Films of pure polyvinyl alcohol (PVA) and its manganese chloride filled polymer composite film (MPVA) were prepared and their optical properties were evaluated. XRD, UV-vis, and FTIR analyses reveal that there is strong interaction between polyvinyl alcohol and manganese chloride. Interchain separation (R) for pristine PVA and MPVA composite films was found as 5.60 and 4.69 Ǻ , respectively, thus showing polymer chains are more compact in MPVA. Optical band gap of polyvinyl alcohol was reduced on incorporation of manganese chloride in polyvinyl alcohol to cause approximately 2.5-fold increase in optical conductivity. Refractive index of MPVA was found to be higher than that of PVA in the visible range up to 710 nm but beyond that it became lower than that of PVA. Abbe Number was decreased on incorporation of manganese chloride to PVA with concomitant increase in dispersion energy. Urbach energy (E u ) for PVA and MPVA was found to be 0.70 and 0.82 eV, respectively. AFM study reveals formation of sunflower like assembled texture at nano-scale level in MPVA film and it exhibits a higher root mean square (RMS) roughness and absorbance than those of pristine PVA film. Average oscillation wavelength (λ 0 ) was found to be close to the respective absorption edge; and MPVA showed higher oscillation strength (S 0 ) than that of PVA. POLYM. COMPOS., 40:E765-E775, 2019.POLYMER COMPOSITES-2019 FIG. 1. XRD record of (a) PVA film and (b) MPVA film; Inset shows the XRD record of manganese chloride. E766 POLYMER COMPOSITES-2019 DOI 10.1002/pc FIG. 2. FTIR spectra of (a) pure PVA and (b) MPVA films. The magnified version of spectra in the box is shown at the top.

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“…WD model expressed the relation between the refractive index ( n ), E o , and E d by the following relation .

\frac{1}{n^{2} - 1} = \frac{E_{normalo}}{E_{normald}} - \frac{1}{E_{o} E_{d}} {(italichv)}^{2}

…”

Section: Resultsmentioning

confidence: 99%

Microstructural and optical properties of polyvinyl alcohol/manganese chloride composite film

Banerjee

Jain²,

Mukherjee

2018

Polymer Composites

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“…Super‐small metal nanoparticles have unique properties such as quantum confinement effect and Coulomb‐blockade effect (i.e., <10 nm), which may result in unusual property improvement of their composites when compared with those filled with conventional metal particles . For example, it has been found from previous research that the super‐small Ag nanoparticle can enhance the breakdown strength and/or suppress the dielectric loss of the polymer and polymer composites . In contrast, the Ag nanoparticles with relatively large size (e.g., 100 nm) behave like conventional metal particle, resulting in significant enhancement of electrical conductivity and dielectric loss .…”

Section: Introductionmentioning

confidence: 99%

Strawberry‐like Core–Shell Ag@Polydopamine@BaTiO₃ Hybrid Nanoparticles for High‐k Polymer Nanocomposites with High Energy Density and Low Dielectric Loss

Yang

Huang

et al. 2015

Adv Materials Inter

144

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high-energy-density storage devices, and electromechanical actuators. [1][2][3][4][5][6] In general, the traditional ferroelectric ceramics such as BaTiO 3 (BT) have large dielectric constant, but the low breakdown strength and poor processing property limit their application. On the other hand, despite having the merits of high breakdown strength, low dielectric loss and ease of processing, the polymer fi lms generally suffer from low dielectric constant (e.g., <5), which seriously limit their application in the next generation of energy storage devices. [ 7 ] Introducing high-dielectric-constant (high-k ) ceramics into polymer matrix is a classic approach to high-k composite materials and has been extensively investigated in the past decades. [8][9][10][11][12][13][14] However, the large electrical mismatch between ceramic fi llers and polymers usually results in signifi cant decrease of breakdown strength. In addition, the poor compatibility between the inorganic fi llers and the organic polymer matrix results in weak interfacial adhesion and aggregation, leads to high dielectric loss and further decrease of breakdown strength. [ 15,16 ] To solve these issues, a variety of novel nanostructured inorganic-organic hybrid fi llers (e.g., core-shell structured nanoparticles) have been developed. In such materials, the inorganic core processes high dielectric constant, and the organic shell generally provides strong interchain forces with polymer matrix [17][18][19][20] or directly acts as matrix. [21][22][23][24][25][26][27][28][29] Therefore, the interfacial adhesion between the inorganic fi llers and the organic polymer matrix can be improved and the dielectric properties of the resulting nanocomposites can be greatly enhanced. For example, via in situ metallocene catalytic olefi n polymerization, a series of core-shell structured polyolefi n-based nanocomposites with high dielectric constant and low dielectric loss were prepared by Marks and co-workers. [23][24][25][26][27] Through in situ atom transfer radical polymerization (ATRP) [ 22 ] and reversible addition-fragmentation chain transfer (RAFT) [ 20,21 ] polymerization from the BaTiO 3 surface, our group also successfully prepared a series of core-shell structured nanocomposites with excellent dielectric properties. Thus, more and more attention has been paid to the development of new materials with the aforementioned nanostructured to realize the desirable dielectric properties in Flexible nanocomposites comprising of polymer and high-dielectric-constant (high-k ) ceramic nanoparticles are becoming increasingly attractive for dielectric and energy storage applications in modern electronic and electric industry. However, a huge challenge still remains. Namely, the increase of dielectric constant usually at the cost of signifi cant decrease of breakdown strength of the nanocomposites because of the electric fi eld distortion and concentration induced by the high-k fi ller. To address this long-standing problem, by using nano-Ag decorated core-shell polydopami...

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“…There are numerous reports in literature which show an increase in conductivity of PVA after incorporation of Ag, Cu, I, etc. nanoparticles . By far no studies have been carried out to establish conduction mechanism in SiC‐PVA nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

Modification of structural, thermal, and electrical properties of PVA by addition of silicon carbide nanocrystals

Saini¹,

Sharma²,

Rozra³

et al. 2015

J of Applied Polymer Sci

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SiC-PVA nanocomposite films, synthesized using solution-casting technique were structurally characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. Morphological studies of the SiC-PVA nanocomposite films were carried out using Transmission electron microscopy (TEM) and Scanning electron microscopy (SEM). TEM analysis confirms that the size of SiC nanocrystals present in PVA matrix are 23 6 9 nm, which is consistent with size calculated using XRD. SiC-PVA nanocomposite films were further characterized for their thermal and electrical properties. Thermogravimetric/ differential thermal analysis (TG/DTA) indicates that the char yield of nanocomposite films containing 3 wt % SiC nanocrystal is 30% more than PVA. This increase in char yield is an indication of the potency of flame retardation of SiC-PVA nanocomposite films. I-V analysis reveals that Schottky mechanism is the dominant conduction mechanism which is responsible for the increase in conductivity of PVA with the addition of SiC nanocrystals.

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Tailoring of electrical, optical and structural properties of PVA by addition of Ag nanoparticles

Cited by 138 publications

References 34 publications

Microstructural and optical properties of polyvinyl alcohol/manganese chloride composite film

Microstructural and optical properties of polyvinyl alcohol/manganese chloride composite film

Strawberry‐like Core–Shell Ag@Polydopamine@BaTiO₃ Hybrid Nanoparticles for High‐k Polymer Nanocomposites with High Energy Density and Low Dielectric Loss

Modification of structural, thermal, and electrical properties of PVA by addition of silicon carbide nanocrystals

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Tailoring of electrical, optical and structural properties of PVA by addition of Ag nanoparticles

Cited by 138 publications

References 34 publications

Microstructural and optical properties of polyvinyl alcohol/manganese chloride composite film

Microstructural and optical properties of polyvinyl alcohol/manganese chloride composite film

Strawberry‐like Core–Shell Ag@Polydopamine@BaTiO3 Hybrid Nanoparticles for High‐k Polymer Nanocomposites with High Energy Density and Low Dielectric Loss

Modification of structural, thermal, and electrical properties of PVA by addition of silicon carbide nanocrystals

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Strawberry‐like Core–Shell Ag@Polydopamine@BaTiO₃ Hybrid Nanoparticles for High‐k Polymer Nanocomposites with High Energy Density and Low Dielectric Loss