Enhanced optical, dielectric and transport properties in PVDF based (La0.5Bi0.5FeO3)0.5-(BaTiO3)0.5 composites

IF 4.4 3区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Saurabh Prasad , Harshavardhan Chouhan , B.N. Parida , R.K. Parida
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Abstract

In this comprehensive study, we investigated PVDF composites incorporating LaBiFeO3-BaTiO3 (LaBiFO-BaTO) perovskite fillers, focusing on their structural, optical, dielectric, impedance, modulus and DC-conductivity properties. The fabrication involved precise preparation of LaBiFO-BaTO perovskite via solid-state reaction, ensuring phase purity conducive to composite integration. Using a solution casting method, PVDF films with varying LaBiFO-BaTO concentrations (5 %, 10 %, and 15 % wt) were successfully synthesized. XRD confirmed the synthesis of single-phase LaBiFO-BaTO and revealed structural modifications in PVDF composites, highlighting improved filler-matrix interactions at higher concentrations. Scanning electron microscopy and atomic force microscopy depicted the morphological evolution and surface roughness changes with increasing filler content. Optical studies indicated a red shift in absorption spectra with higher LaBiFO-BaTO concentrations, correlating with a decrease in the direct band gap energy of the composites. Electrical characterization demonstrated enhanced dielectric properties and impedance behaviour in PVDF/LaBiFO-BaTO composites, suggesting their suitability for applications in capacitors and optoelectronic devices. This systematic investigation provides valuable insights into optimizing PVDF-based composites for advanced functional materials. The composites exhibit enhanced dielectric permittivity at room temperature, attributed to space charge polarization and the high dielectric constant of LaBiFO-BaTO. Dielectric loss (tanδ) remains minimal (<0.1), decreasing with frequency, indicative of low energy dissipation suitable for high-frequency applications. Further the dielectric relaxation have been examined using Havrilak-Negami model. Impedance and modulus analyses reveal temperature-dependent behaviours, with reduced impedance and enhanced charge transfer kinetics in higher concentration composites. DC conductivity measurements demonstrate increased charge transport properties with temperature, influenced by thermally activated charge hopping mechanisms. Overall, PVDF/LaBiFO-BaTO composites show promising characteristics for capacitors, sensors, and optoelectronic devices, suggesting avenues for further optimization and broader application in advanced technologies.

Abstract Image

增强基于 PVDF 的 (La0.5Bi0.5FeO3)0.5-(BaTiO3)0.5 复合材料的光学、介电和传输特性
在这项综合研究中,我们研究了含有 LaBiFeO3-BaTiO3 (LaBiFO-BaTO) 包晶填料的 PVDF 复合材料,重点关注其结构、光学、介电、阻抗、模量和直流导电性能。制备过程包括通过固态反应精确制备 LaBiFO-BaTO 包晶,以确保有利于复合集成的相纯度。利用溶液浇铸法,成功合成了不同LaBiFO-BaTO浓度(5%、10%和15% wt)的PVDF薄膜。XRD 证实了单相 LaBiFO-BaTO 的合成,并揭示了 PVDF 复合材料的结构变化,突出显示了较高浓度时填料与基质之间相互作用的改善。扫描电子显微镜和原子力显微镜描绘了随着填料含量的增加而发生的形态演变和表面粗糙度变化。光学研究表明,LaBiFO-BaTO 浓度越高,吸收光谱越红移,这与复合材料直接带隙能的降低有关。电学表征显示,PVDF/LaBiFO-BaTO 复合材料的介电性能和阻抗行为得到了增强,表明它们适合应用于电容器和光电设备。这项系统性研究为优化基于 PVDF 的先进功能材料复合材料提供了宝贵的见解。复合材料在室温下表现出更高的介电常数,这归因于空间电荷极化和 LaBiFO-BaTO 的高介电常数。介电损耗(tanδ)仍然很小(<0.1),并随频率降低,表明能量耗散低,适合高频应用。此外,还使用 Havrilak-Negami 模型对介电弛豫进行了研究。阻抗和模量分析显示了与温度有关的行为,在高浓度复合材料中阻抗降低,电荷转移动力学增强。直流电导测量结果表明,电荷传输特性随着温度的升高而增强,这是受热启动电荷跳跃机制的影响。总之,PVDF/LaBiFO-BaTO 复合材料在电容器、传感器和光电设备方面表现出良好的特性,为进一步优化和更广泛地应用于先进技术提供了途径。
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来源期刊
Inorganic Chemistry Communications
Inorganic Chemistry Communications 化学-无机化学与核化学
CiteScore
5.50
自引率
7.90%
发文量
1013
审稿时长
53 days
期刊介绍: Launched in January 1998, Inorganic Chemistry Communications is an international journal dedicated to the rapid publication of short communications in the major areas of inorganic, organometallic and supramolecular chemistry. Topics include synthetic and reaction chemistry, kinetics and mechanisms of reactions, bioinorganic chemistry, photochemistry and the use of metal and organometallic compounds in stoichiometric and catalytic synthesis or organic compounds.
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