表面功能化碳量子点与反铁电液晶分子的互接以增强电光特性

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Amir Iqbal, Magdalena Urbanska, Roman S. Dabrowski, Sandeep Kumar, Ravindra Dhar
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引用次数: 0

摘要

我们研究了碳量子点(CQDs)在宽温度范围室温反铁电液晶混合物中的效应。我们采用了多种技术,包括拉曼光谱、紫外-可见傅立叶变换红外光谱和高分辨率透射电子显微镜(HRTEM)来表征合成的碳量子点。高分辨透射电子显微镜图像显示,粒径为 1.0-5.5 纳米的 CQDs 呈准球形。在反铁电手性 Smectic C (SmC*a) 相的宽温度范围和铁电手性 Smectic C (SmC*) 相的窄温度范围内,研究了 W-287 混合物及其纳米复合材料(含 CQDs)的纹理和开关特性。观察到的纹理和其他开关特性被用来识别不同介相的出现。与纯 W-287 AFLC 混合物相比,本研究发现 SmC*a 相的自发极化(329 nC/cm2 至 706 nC/cm2)急剧增加,开关时间(3 ms 至 20 μs)、旋转粘度(49 mPa s 至 7 mPa s)和复合系统的锚定能量系数大幅下降。观察到的变化是由于 CQDs 的 sp3/sp2 杂化增强了偶极有序性,在液晶基质中形成了强烈的耦合。这项研究表明,分散的 CQDs 在本 AFLC 混合物的基质中有效沉降,不会干扰宿主的分子排序。这些发现对于复合系统在微秒级响应光学设备中的潜在应用非常有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Interfacing of Surface Functionalized Carbon Quantum Dots with Antiferroelectric Liquid Crystalline Molecules to Enhance Electro-Optical Characteristics

Interfacing of Surface Functionalized Carbon Quantum Dots with Antiferroelectric Liquid Crystalline Molecules to Enhance Electro-Optical Characteristics
We have studied the effects of carbon quantum dots (CQDs) in a wide temperature range room-temperature antiferroelectric liquid crystal mixture. Multiple techniques, including Raman, UV–vis Fourier transform infrared spectroscopies, and high-resolution transmission electron microscopy (HRTEM), are used to characterize the synthesized CQDs. The HRTEM image indicates the quasi-spherical shape of CQDs of particle size 1.0–5.5 nm. Textural and switching characteristics of mixture W-287 and its nanocomposites (with CQDs) are investigated in the wide temperature range of the antiferroelectric chiral smectic C (SmC*a) phase and the narrow range of the ferroelectric chiral smectic C (SmC*) phase. Observed textures and other switching characteristics were used to identify the appearance of different mesophases. Compared to the pure W-287 AFLC mixture, a drastic increase in spontaneous polarization (329 to 706 nC/cm2), a substantial decrease of switching time (3 ms to 20 μs), rotational viscosity (49 to 7 mPa s), and anchoring energy coefficients for the composite systems were found for the SmC*a phase in the present investigation. The observed changes are due to the enhanced dipolar ordering as a consequence of the sp3/sp2 hybridization of CQDs, which forms an intense coupling in the liquid crystal matrix. This study signifies that the dispersed CQDs have effectively settled in the matrix of the present AFLC mixture without interfering with the hosts’ molecular ordering. These findings are useful for the potential applicability of composite systems for optical devices with a microsecond response.
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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
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