Electric field-induced self-assembly of multiferroic core-shell nanocrystals in anisotropic liquid crystal medium

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-08-07 DOI:10.1063/5.0280449

Amit Kumar, Jai Prakash, Yogita Sagar, Nilesh Pote, Asif Ali Ansari, Prasun Ganguly, Ajay Kumar, A. Banpurkar

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引用次数: 0

Abstract

Here, we present the observations on the morphological appearance of multiferroic core-shell CoFe2O4/ZnO nanocrystals (CFZNCs) dispersed into the nematic liquid crystal (NLC, 5CB) matrix. A concentration-dependent patterning of CFZNCs clusters has been found to nucleate during the Fréedericksz transition on the application of sufficient dc bias across the CFZNCs/5CB samples. Well-ordered two-dimensional patterns were seen for intermediate doping concentrations of CFZNCs (0.05 wt. % and 0.1 wt. %), whereas, intense aggregation was observed at higher concentration (0.2 wt. %). It has been found that the size of the planarly aligned patterned domains (PPDs) varied (from 25 to 6 μm) on increasing the dc bias across the CFZNCs/5CB composite during the Fréedericksz transitions. Interestingly, the chain-like clusters of CFZNCs appeared on the circumference of the PPDs embedded within the homeotropically aligned 5CB material. The formation of PPDs could be attributed to the LC-anisotropy-imparted ordering of CFZNCs in the vicinity of Fréedericksz transition. We hope that the present work will add to our understanding of LC-imparted self-assembly of NCs/QDs in an anisotropic medium like LCs for facilitating their applications in the fabrication of photonic devices.

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各向异性液晶介质中多铁芯壳纳米晶体的电场诱导自组装

本文研究了分散在向列相液晶（NLC, 5CB）基体中的多铁性CoFe2O4/ZnO纳米晶体（CFZNCs）的形貌。在CFZNCs/5CB样品上施加足够的直流偏压时，CFZNCs簇的浓度依赖性图案在fr edericksz过渡期间成核。在中等浓度的cfznc （0.05 wt. %和0.1 wt. %）中，可以观察到有序的二维模式，而在较高浓度（0.2 wt. %）中，可以观察到强烈的聚集。研究发现，在fr edericksz过渡过程中，随着直流偏置的增加，cfznc /5CB复合材料的平面排列图案畴（PPDs）的大小从25 μm到6 μm不等。有趣的是，链状的CFZNCs团簇出现在嵌入在同向热带排列的5CB材料中的ppd的圆周上。PPDs的形成可归因于fr edericksz跃迁附近CFZNCs的lc -各向异性影响的排序。我们希望本工作将增加我们对lc在lc等各向异性介质中赋予nc / qd自组装的理解，以促进其在光子器件制造中的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.