Investigating the dielectric constant of barium titanate in a polymer-matrix nanocomposite
Investigating the dielectric constant of barium titanate in a polymer-matrix nanocomposite
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DOI：
10.1557/s43580-022-00319-x
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发表时间：
2022-08-02
期刊：
影响因子：
0.8
通讯作者：
Monson, Todd
中科院分区：
文献类型：
--
作者：
Cooper, Emma;De Anda, Eduardo;Monson, Todd
钛酸钡(BTO)是一种用于电容器的铁电材料，具有较高的体介电常数。然而，BTO的大小对其介电常数的影响还没有完全了解，并且存在很大的争议。在这里，我们提出了一个研究的介电常数的BTO纳米颗粒的直径在50到500 nm之间。将BTO纳米粒子掺入丁二烯-丙烯腈-苯乙烯中，注射成型平行板电容器，用于测定纳米复合介电常数。通过对含BTO的ABS基纳米复合材料的COMSOL模拟，结合实验测量和计算结果，得到了BTO纳米复合材料的介电常数。在纳米粒子直径小于200 nm时，BTO的介电常数相对恒定，但在较小的纳米粒子尺寸时，BTO的介电常数急剧下降。这些结果将有助于利用BTO纳米颗粒改进能量存储和电力调节系统的开发。
Barium titanate (BTO) is a ferroelectric material used in capacitors because of its high bulk dielectric constant. However, the impact of the size of BTO on its dielectric constant is not yet fully understood and is highly contested. Here, we present an investigation into the dielectric constant of BTO nanoparticles with diameters ranging between 50 and 500 nm. BTO nanoparticles were incorporated into acrylonitrile butadiene styrene and injection molded into parallel plate capacitors, which were used to determine nanocomposite dielectric constants. The dielectric constants of BTO nanoparticles were obtained by combining experimental measurements with computational results from COMSOL simulations of ABS-matrix nanocomposites containing BTO. The dielectric constant of BTO was observed to be relatively constant at nanoparticle diameters as small as 200 nm but sharply declined at smaller nanoparticle sizes. These results will be useful in the development of improved energy storage and power conditioning systems utilizing BTO nanoparticles.