Optical properties of pure and doped PVA:PEO based solid polymer blend electrolytes: two methods for band gap study

Aziz, Shujahadeen B.; Abdullah, Omed Gh.; Hussein, Ahang M.; Abdulwahid, Rebar T.; Rasheed, Mariwan A.; Ahmed, Hameed M.; Abdalqadir, Sarbast W.; Mohammed, Awara R.

doi:10.1007/s10854-017-6437-1

Cited by 106 publications

(79 citation statements)

References 34 publications

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“…(d), the discharge capacity of the battery assembled with PEO‐20%Li electrolyte is only 19 mA h g −1 after 50 cycles at 1C. This may ascribed to degradation of the pristine PEO and the result is similar to previous studies . The discharge capacity of the all‐solid‐state battery using a composite electrolyte (TPU/PEO‐5%SiO 2 ‐20%Li) remains 110 mA h g −1 after 100 cycles at 1C, and the capacity retention reached about 91%.…”

Section: Resultssupporting

confidence: 81%

“…However, the intensity of the peaks of PEO decreased with the addition of SiO 2 particles, indicating that the amorphous SiO 2 can induce more amorphous structures in the CPEs. This may be because the amorphous SiO 2 fillers destroyed the ordered arrangement of the PEO chains and resulted in enhancement of an amorphous phase . It should be noted that the amorphous structure in the polymer electrolyte matrix is very important and improves the ionic conductivity of the CPEs…”

Section: Resultsmentioning

confidence: 99%

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Composite polymer electrolytes based on electrospun thermoplastic polyurethane membrane and polyethylene oxide for all‐solid‐state lithium batteries

Gao

Wang

Zhu

et al. 2018

Polymer International

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To improve the electrochemical properties and enhance the mechanical strength of solid polymer electrolytes, series of composite polymer electrolytes (CPEs) were fabricated with hybrids of thermoplastic polyurethane (TPU) electrospun membrane, polyethylene oxide (PEO), SiO2 nanoparticles and lithium bis(trifluoromethane)sulfonamide (LiTFSI). The structure and properties of the CPEs were confirmed by SEM, XRD, DSC, TGA, electrochemical impedance spectroscopy and linear sweep voltammetry. The TPU electrospun membrane as the skeleton can improve the mechanical properties of the CPEs. In addition, SiO2 particles can suppress the crystallization of PEO. The results show that the TPU‐electrospun‐membrane‐supported PEO electrolyte with 5 wt% SiO2 and 20 wt% LiTFSI (TPU/PEO‐5%SiO2‐20%Li) presents an ionic conductivity of 6.1 × 10−4 S cm−1 at 60 °C with a high tensile strength of 25.6 MPa. The battery using TPU/PEO‐5%SiO2‐20%Li as solid electrolyte and LiFePO4 as cathode shows an attractive discharge capacity of 152, 150, 121, 75, 55 and 26 mA h g−1 at C‐rates of 0.2C, 0.5C, 1C, 2C, 3C and 5C, respectively. The discharge capacity of the cell remains 110 mA h g−1 after 100 cycles at 1C at 60 °C (with a capacity retention of 91%). All the results indicate that this CPE can be applied to all‐solid‐state rechargeable lithium batteries. © 2018 Society of Chemical Industry

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Composite polymer electrolytes based on electrospun thermoplastic polyurethane membrane and polyethylene oxide for all‐solid‐state lithium batteries

Gao

Wang

Zhu

et al. 2018

Polymer International

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“…Here, it is also shown that only certain electrons near the Fermi surface can participate to conduct once they absorb photon energies [14,28]. The type of electronic transition and the optical band gap can be determined by comparison of plots obtained from Tauc's equation to those of optical dielectric loss [14,25]. Therefore, the results of this study can reveal the possibility of using measurable macroscopic parameters, such as the optical dielectric loss , to study the band gap structure.…”

Section: ]mentioning

confidence: 85%

“…To precisely specify the types of electronic transition in the samples, optical dielectric loss must be examined. In our previous works [14,25], it is established that the optical dielectric loss is the only parameter that can be used successfully to study the optical band gap and identify the dominant type of electronic transition. Journal of Nanomaterials The optical dielectric function is reported to be closely correlated to the electron-photon interaction, connecting the solid electronic structure to the physical process of interband transition.…”

Section: ]mentioning

confidence: 99%

New Method for the Development of Plasmonic Metal-Semiconductor Interface Layer: Polymer Composites with Reduced Energy Band Gap

Aziz

Mamand

Saed

et al. 2017

Journal of Nanomaterials

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Silver nanoparticles within a host polymer of chitosan were synthesized by using in situ method. Ultraviolet-visible spectroscopy was then carried out for the prepared chitosan : silver triflate (CS : AgTf) samples, showing a surface plasmonic resonance (SPR) peak at 420 nm. To prepare polymer composites with reduced energy band gap, different amounts of alumina nanoparticles were incorporated into the CS : AgTf solution. In the present work, the results showed that the reduced silver nanoparticles and their adsorption on wide band gap alumina (Al 2 O 3 ) particles are an excellent approach for the preparation of polymer composites with small optical band gaps. The optical dielectric loss parameter has been used to determine the band gap experimentally. The physics behind the optical dielectric loss were interpreted from the viewpoint of quantum mechanics. From the quantum-mechanics viewpoint, optical dielectric loss was also found to be a complex equation and required lengthy numerical computation. From the TEM investigation, the adsorption of silver nanoparticles on alumina has been observed. The optical micrograph images showed white spots (silver specks) with different sizes on the surface of the films. The second semicircle in impedance Cole-Cole plots was found and attributed to the silver particles.

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“…The regression values ( R 2 ≈ 1) indicate a good fit to the experimental data. Prior reports established that the linear dependent of refractive index is an indicatotr for the homogeneous dispersion of the filler particles throughout the host polymer . The increase in refractive index from 1.2 for high salt concentration (40 wt %) before treatment to 1.59 after H 2 S treatment was related to the changes happened in the electronic structure of the sample.…”

Section: Resultsmentioning

confidence: 94%

Surfaces modification of methylcellulose: Cobalt nitrate polymer electrolyte by sulfurated hydrogen gas treatment

Abdullah

Aziz

et al. 2018

J of Applied Polymer Sci

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This article discusses the surface modification of methylcellulose:nitrate cobalt [MC:Co(NO3)2] through the sulfurated hydrogen (H2S) gas treatment. Solution cast technique has been used to fabricate MC:Co(NO3)2‐based solid polymer electrolytes. The results achieved for structural, morphological and optical properties indicate that H2S gas treatment is crucial for modification of polymer electrolytes to polymer composites. The morphological appearance revealed that the H2S gas treatment produced cobalt sulfide (CoS) nanoparticles on the surface of the films. The results of X‐ray diffraction indicate the disruption of the crystalline phase of the MC polymer upon addition of various amounts of Co(NO3)2 salt. The optical absorption spectra of the electrolyte samples shifted to higher wavelengths with increasing the cobalt nitrate salt concentration. The optical band gap of MC incorporated with 40 wt % Co(NO3)2 concentration was 4.69 and reduced to 4.52 eV after H2S surface treatment. The linear relationship between the refractive index and salt concentration supports the uniform distribution of the developed nanoparticles appeared in STM images. The significant change in intensity and position of Fourier transform infrared transmittance bands is an evidence for the formation of charge transfer complex between the added salt and the MC host polymer. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46676.

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Optical properties of pure and doped PVA:PEO based solid polymer blend electrolytes: two methods for band gap study

Cited by 106 publications

References 34 publications

Composite polymer electrolytes based on electrospun thermoplastic polyurethane membrane and polyethylene oxide for all‐solid‐state lithium batteries

Composite polymer electrolytes based on electrospun thermoplastic polyurethane membrane and polyethylene oxide for all‐solid‐state lithium batteries

New Method for the Development of Plasmonic Metal-Semiconductor Interface Layer: Polymer Composites with Reduced Energy Band Gap

Surfaces modification of methylcellulose: Cobalt nitrate polymer electrolyte by sulfurated hydrogen gas treatment

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