Strain-Modified Chirality in Selenium-Alloyed Tellurium Nanocrystals

IF 7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Chemistry of Materials Pub Date : 2025-08-29 DOI:10.1021/acs.chemmater.5c01950

Bar Reuven, Amram Azulay, Davide Levy, Abdullah Idrees, Amit Kohn and Gil Markovich*,

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Abstract

We investigated the effects of selenium alloying on the shape chirality of colloidal trigonal tellurium nanocrystals (NCs) containing up to ∼6 at. % Se. Circular dichroism spectroscopy shows stronger optical activity in alloyed samples, relative to pure Te NCs, indicating enhanced shape chirality. X-ray diffraction analysis revealed a contraction of the c-axis lattice parameter, attributed to smaller Se atoms substituting for Te, resulting in compressive strain. Furthermore, the average microstrain increases with increasing Se content, along with the development of strong axial strain distribution anisotropy, which is consistent with the intrinsic anisotropy of the Te lattice. Analysis of interplanar spacings from scanning transmission electron microscopy images at atomic-column resolution confirms the existence of heterogeneous intraparticle strain distributions. Hence, these results imply that substitutional Se point defects in Te cause anisotropic strain gradients, which enhance the tendency of chiral Te NCs to form more asymmetric shapes. This study demonstrates how strain engineering by alloying can be employed to tune the structural and optical properties of colloidal NCs.

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硒合金碲纳米晶体中应变修饰的手性

我们研究了硒合金化对含有高达~ 6 at的胶体三角碲纳米晶体（NCs）形状手性的影响。%。圆二色性光谱显示，合金样品的光学活性比纯Te nc更强，表明形状手性增强。x射线衍射分析揭示了c轴晶格参数的收缩，归因于更小的Se原子取代了Te，导致压缩应变。平均微应变随Se含量的增加而增加，并发展出较强的轴向应变分布各向异性，这与Te晶格的本征各向异性相一致。原子柱分辨率扫描透射电镜图像的面间间距分析证实了颗粒内不均匀应变分布的存在。因此，这些结果表明，Te中的取代性Se点缺陷引起各向异性应变梯度，从而增强了手性Te NCs形成更不对称形状的趋势。本研究展示了如何通过合金化应变工程来调整胶体NCs的结构和光学特性。

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来源期刊

Chemistry of Materials 工程技术-材料科学：综合

CiteScore

14.10

自引率

5.80%

发文量

929

审稿时长

1.5 months

期刊介绍： The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.