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首页> 外文期刊>Materials Science and Engineering >Synthesis and dielectric investigations of bismuth sulfide particles filled PVA: Polypyrrole core-shell nanocomposites
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Synthesis and dielectric investigations of bismuth sulfide particles filled PVA: Polypyrrole core-shell nanocomposites

机译：填充PVA的硫化铋颗粒的合成与介电研究：聚吡咯核壳纳米复合材料

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摘要

High dielectric composites of bismuth sulfide (Bi_2S_3) filled in poly (vinyl alcohol) (PVA)/polypyrrole (PPy) blend were prepared. Fourier Transform Infrared Spectroscopic analysis infers the encapsulation of Bi_2S_3 particles by PVA: PPy matrix. The thermal activation is estimated using Coats and Redfern equation from thermogravimetric analysis results. SEM micrographs revealed that Bi_2S_3 filled PVA:PPy blend composite films possess smooth surface and homogeneous dispersion of particles. The frequency dependence of dielectric constant, loss tangent and electric modulus were analyzed. The characteristic relaxation times for dielectric loss within the composites are calculated. The AC conductivity is maximum for 8 wt% of bismuth sulfide particles. The dielectric parameters and AC conductivity are temperature dependent. The dielectric response parameter s follows the correlated barrier hopping model and accordingly effective barrier height (W_m) of the composite for 8 wt% Bi_2S_3 filled PVA: PPy are determined.
机译：制备了填充有聚乙烯醇（PVA）/聚吡咯（PPy）混合物的硫化铋（Bi_2S_3）高介电复合材料。傅立叶变换红外光谱分析法可推断PVA：PPy基质对Bi_2S_3粒子的包封。根据热重分析结果，使用Coats和Redfern方程估算热活化。 SEM显微照片显示，Bi_2S_3填充的PVA：PPy共混复合膜具有光滑的表面和均匀的颗粒分散性。分析了介电常数，损耗角正切和电模量的频率依赖性。计算了复合材料中介电损耗的特征弛豫时间。对于8 wt％的硫化铋颗粒，AC电导率最大。介电参数和交流电导率取决于温度。介电响应参数s遵循相关的势垒跳跃模型，因此确定了8 wt％Bi_2S_3填充的PVA：PPy的复合材料的有效势垒高度（W_m）。

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