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基于多功能硫化镉纳米材料的液晶可切换器件的评估

Evaluation of Versatile CdS Nanomaterials Based Liquid Crystals Switchable Device.

作者信息

Pal Kaushik, Thomas Sabu, Madhu Mohan M L N

出版信息

J Nanosci Nanotechnol. 2017 Apr;17(4):2401-412. doi: 10.1166/jnn.2017.13457.

Abstract

Novel synthesis and properties of versatile CdS nanostructures (e.g., Nano-brush, nano-cube, nanosphere) dispersed liquid crystals application in chemical friendly medium exploring this article. Most recent studies, CdS nano-wire brush with the stacking fault structures were hydrothermally synthesized through a dissolution-recrystallization approach in concentrated ammonia solvent in one step solution, for the first time. Those structures-property relations with respect to ferroelectric hydrogen-bonded liquid-crystalline complex (HBLC; AC + 5BAO) controlled and efficient formation of surface relief nanostructures. A successful attempt has been made to form hydrogen bonding between CdS nanostructures and supramolecular LC with p–n-alkyloxy benzoic acids (n-OBA). The formation of an inter-H-bond is evinced through FTIR study, as well as Gaussian simulation also ensures complete formation of intermolecular hydrogen bond optimized geometry. In contrast, a new sensitive response of smectic G ordering observed in this series is investigated by constructing a phase diagram obtained from two binary mixtures of CdS nanostructures influenced by homogeneous liquid crystals. Temperature-dependent dielectric relaxation, tilt angle, electro-optical switching measurements allow for monitoring very unique and useful behavior in that the polarization of the emission from the semiconductor nanostructures can be controlled by an external bias. It reveals electrically tunable interaction of the composites may allow for engineering of practical electro-optic switchable device.

摘要

本文探索了在化学友好介质中分散的多功能硫化镉纳米结构(如纳米刷、纳米立方体、纳米球)的新型合成方法及性能,以及它们在液晶中的应用。最近的研究首次通过在浓氨溶剂中的一步溶液中采用溶解-重结晶方法,水热合成了具有堆垛层错结构的硫化镉纳米线刷。这些结构与铁电氢键液晶复合物(HBLC;AC + 5BAO)的性能关系,以及表面起伏纳米结构的受控和高效形成。已成功尝试在硫化镉纳米结构与含有对-正烷氧基苯甲酸(n-OBA)的超分子液晶之间形成氢键。通过傅里叶变换红外光谱(FTIR)研究证明了氢键的形成,高斯模拟也确保了分子间氢键优化几何结构的完全形成。相比之下,通过构建由受均匀液晶影响的硫化镉纳米结构的两种二元混合物获得的相图,研究了该系列中观察到的近晶G有序的新敏感响应。温度依赖性介电弛豫、倾斜角、电光开关测量允许监测非常独特且有用的行为,即半导体纳米结构发射的极化可以通过外部偏置来控制。这表明复合材料的电可调相互作用可能允许设计实用的电光可切换器件。

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