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<p>Herein, bismuth tungstate (Bi<sub>2</sub>WO<sub>6</sub>) nanoparticles (NPs) were synthesized employing solution combustion approach using lemon juice as fuel. The successful synthesis of Bi<sub>2</sub>WO<sub>6</sub> NPs was confirmed by X-ray diffraction (XRD) and High resolution transmission electron microscopy (HR-TEM) methods which revealed the formation of nanoparticles with particles size 90–100&#xa0;nm having a spherical geometry. A series of polyvinyl alcohol (PVA) nanocomposites (NCs) with varying Bi<sub>2</sub>WO<sub>6</sub> NPs filler compositions viz. 0, 1, 2, 4, and 8 wt % were fabricated using an eco-friendly solvent intercalation process. X-ray diffraction analysis of the PVA/Bi<sub>2</sub>WO<sub>6</sub> NCs revealed microcrystalline changes, providing evidence of the existence of Van der Waals interactions between Bi<sub>2</sub>WO<sub>6</sub> NPs and the PVA matrix. Differential scanning calorimetry (DSC) analysis shows that incorporation of the Bi<sub>2</sub>WO<sub>6</sub> NPs into the PVA matrix increases the glass transition temperature (Tg) of PVA from 97.5&#xa0;°C to 108.16&#xa0;°C and melting temperature (T<sub>m</sub>) of plain shows a slight increase, rising from 188 to 190.7<sup>º</sup> C. The optical characteristics of different PVA/Bi<sub>2</sub>WO<sub>6</sub> NC films carried out using UV-visible spectroscopy confirmed a strong Bi<sub>2</sub>WO<sub>6</sub> filler concentration dependent UV-absorption in the wavelength range of 210–290&#xa0;nm thereby demonstrating an excellent UV-protection behavior. The transmittance, refractive index, absorption coefficient, optical band gap and Urbach energy of NCs determined from absorption spectral data also supported these findings. The band gap and Urbach energy showed a Bi<sub>2</sub>WO<sub>6</sub> NPs concentration-dependent decrease for different NCs suggesting the formation of localized states in the forbidden band regions. Dc current measurements were performed on NC films to develop current-voltage (I-V) characteristics to understand the effect of Bi<sub>2</sub>WO<sub>6</sub> NPs dose on electrical behavior of PVA NC films. The I-V characteristics revealed enhancement in electrical conductivity with increasing Bi<sub>2</sub>WO<sub>6</sub> NPs concentration. Based on the above results, it is concluded that PVA/ Bi<sub>2</sub>WO<sub>6</sub> NCs exhibit excellent Bi<sub>2</sub>WO<sub>6</sub> NPs concentration-dependent optical and electrical properties, making them potential materials for optoelectric and optoelectronic devices applications.</p><p></p>

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PVA/Bi2WO6 Nanocomposites: Evaluation of Bi2WO6 Filler Composition on Thermal, Optical, Electrical and Photoluminescence Characteristics

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Vedhavathi Hattna Shivarudraiah,
  • Adalagere Somashekar Manjunatha,
  • Gurappa Sindhu,
  • Beejaganahalli Sangameshwara Madhukar,
  • Veeranapura Lokesh Yashaswini,
  • Ningappa Kumara Swamy

摘要

Herein, bismuth tungstate (Bi2WO6) nanoparticles (NPs) were synthesized employing solution combustion approach using lemon juice as fuel. The successful synthesis of Bi2WO6 NPs was confirmed by X-ray diffraction (XRD) and High resolution transmission electron microscopy (HR-TEM) methods which revealed the formation of nanoparticles with particles size 90–100 nm having a spherical geometry. A series of polyvinyl alcohol (PVA) nanocomposites (NCs) with varying Bi2WO6 NPs filler compositions viz. 0, 1, 2, 4, and 8 wt % were fabricated using an eco-friendly solvent intercalation process. X-ray diffraction analysis of the PVA/Bi2WO6 NCs revealed microcrystalline changes, providing evidence of the existence of Van der Waals interactions between Bi2WO6 NPs and the PVA matrix. Differential scanning calorimetry (DSC) analysis shows that incorporation of the Bi2WO6 NPs into the PVA matrix increases the glass transition temperature (Tg) of PVA from 97.5 °C to 108.16 °C and melting temperature (Tm) of plain shows a slight increase, rising from 188 to 190.7º C. The optical characteristics of different PVA/Bi2WO6 NC films carried out using UV-visible spectroscopy confirmed a strong Bi2WO6 filler concentration dependent UV-absorption in the wavelength range of 210–290 nm thereby demonstrating an excellent UV-protection behavior. The transmittance, refractive index, absorption coefficient, optical band gap and Urbach energy of NCs determined from absorption spectral data also supported these findings. The band gap and Urbach energy showed a Bi2WO6 NPs concentration-dependent decrease for different NCs suggesting the formation of localized states in the forbidden band regions. Dc current measurements were performed on NC films to develop current-voltage (I-V) characteristics to understand the effect of Bi2WO6 NPs dose on electrical behavior of PVA NC films. The I-V characteristics revealed enhancement in electrical conductivity with increasing Bi2WO6 NPs concentration. Based on the above results, it is concluded that PVA/ Bi2WO6 NCs exhibit excellent Bi2WO6 NPs concentration-dependent optical and electrical properties, making them potential materials for optoelectric and optoelectronic devices applications.