Role of BaTiO3 nanoparticles on electro-optic performance of epoxy-resin-based PDLC devices
Role of BaTiO3 nanoparticles on electro-optic performance of epoxy-resin-based PDLC devices
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DOI：
10.1080/02678292.2020.1762129
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发表时间：
2020-05-14
期刊：
影响因子：
2.2
通讯作者：
Sinha, Aloka
中科院分区：
文献类型：
--
作者：
Kumari, Asha;Sinha, Aloka
聚合物分散液晶（PDLC）的物理性能可以根据应用要求通过控制其组成比例和微观结构来调节。添加纳米颗粒是设计PDLCs性能的最方便的方法。本文研究了钛酸钡（BaTiO 3）纳米粒子掺杂对PDLC薄膜的形貌、电光和光学性能的影响。采用热固化聚合诱导相分离法制备了BaTiO 3纳米粒子掺杂的环氧树脂基PDLC薄膜。利用偏光显微镜和扫描电子显微镜研究了钛酸钡纳米颗粒对微结构的影响。电光性能研究表明，纳米钛酸钡的加入降低了器件的上升时间、阈值电压和饱和电压，提高了器件的对比度。掺杂还导致关态透射率曲线的减小和紫外-可见吸收光谱的增加。具有更快上升时间、更低阈值电压、更低饱和电压和更好对比度的BaTiO 3掺杂PDLC薄膜的开发将显著增强基于PDLC的器件在智能窗、传感器和柔性器件中的潜在技术应用。
The physical properties of polymer dispersed liquid crystals (PDLC) can be tuned as per the application requirement by controlling their composition ratio and microstructure. The addition of nanoparticles is the most convenient method to engineer the properties of PDLCs. This paper investigates the effects of barium titanate (BaTiO3) nanoparticle doping on the morphology, electro-optic, and optical properties of PDLC films. The epoxy resins based PDLC films prepared by polymerisation induced phase separation via heat curing method are doped with BaTiO3 nanoparticle for the first time. The impact of BaTiO3 nanoparticle on the microstructure was studied using polarising optical microscopy and scanning electron microscopy. The electro-optic study reveals that the addition of BaTiO3 nanoparticle results in the reduction of rise time, threshold voltage, saturation voltage and enhancement in the contrast ratio. The doping also results in a decrement of the off-state transmittance curve and an increment in the UV-Visible absorption spectrum. The development of BaTiO3 doped PDLC films with faster rise time, lower threshold voltage, lower saturation voltage and better contrast ratio will significantly enhance the potential technological applications of PDLC-based devices for smart windows, sensors and flexible devices.