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尺寸受限的固定组成和组成依赖性的工程能带隙合金在 L-半胱氨酸封端的合金化四元 CdZnTeS 量子点中诱导出不同的内部结构。

Size-confined fixed-composition and composition-dependent engineered band gap alloying induces different internal structures in L-cysteine-capped alloyed quaternary CdZnTeS quantum dots.

机构信息

Laboratory of Biotechnology, Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.

Laboratory of Biotechnology, Department of Bioscience, Graduate School of Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.

出版信息

Sci Rep. 2016 Jun 2;6:27288. doi: 10.1038/srep27288.

DOI:10.1038/srep27288
PMID:27250067
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4890122/
Abstract

The development of alloyed quantum dot (QD) nanocrystals with attractive optical properties for a wide array of chemical and biological applications is a growing research field. In this work, size-tunable engineered band gap composition-dependent alloying and fixed-composition alloying were employed to fabricate new L-cysteine-capped alloyed quaternary CdZnTeS QDs exhibiting different internal structures. Lattice parameters simulated based on powder X-ray diffraction (PXRD) revealed the internal structure of the composition-dependent alloyed CdxZnyTeS QDs to have a gradient nature, whereas the fixed-composition alloyed QDs exhibited a homogenous internal structure. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) analysis confirmed the size-confined nature and monodispersity of the alloyed nanocrystals. The zeta potential values were within the accepted range of colloidal stability. Circular dichroism (CD) analysis showed that the surface-capped L-cysteine ligand induced electronic and conformational chiroptical changes in the alloyed nanocrystals. The photoluminescence (PL) quantum yield (QY) values of the gradient alloyed QDs were 27-61%, whereas for the homogenous alloyed QDs, the PL QY values were spectacularly high (72-93%). Our work demonstrates that engineered fixed alloying produces homogenous QD nanocrystals with higher PL QY than composition-dependent alloying.

摘要

具有吸引人的光学性质的合金量子点 (QD) 纳米晶体的发展对于广泛的化学和生物应用是一个不断发展的研究领域。在这项工作中，采用了尺寸可调的工程带隙组成依赖性合金化和固定组成合金化来制备具有不同内部结构的新型 L-半胱氨酸封端的合金化四元 CdZnTeS QD。基于粉末 X 射线衍射 (PXRD) 模拟的晶格参数揭示了组成依赖性合金化 CdxZnyTeS QD 的内部结构具有梯度性质，而固定组成合金化 QD 则表现出均匀的内部结构。透射电子显微镜 (TEM) 和动态光散射 (DLS) 分析证实了合金纳米晶体的尺寸受限和单分散性。Zeta 电位值在胶体稳定性的可接受范围内。圆二色性 (CD) 分析表明，表面封端的 L-半胱氨酸配体诱导了合金纳米晶体的电子和构象手性变化。梯度合金 QD 的光致发光 (PL) 量子产率 (QY) 值为 27-61%，而对于均匀合金 QD，PL QY 值则非常高 (72-93%)。我们的工作表明，工程固定合金化产生具有更高 PL QY 的均匀 QD 纳米晶体，比组成依赖性合金化更好。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/1bae712aff76/srep27288-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/187c0476b4c5/srep27288-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/81db7e480187/srep27288-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/b8189c2611a2/srep27288-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/1bae712aff76/srep27288-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/187c0476b4c5/srep27288-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/c2c881893ff5/srep27288-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/3ab1ba92b4f8/srep27288-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/11f636aef3ee/srep27288-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/f0f8e8cc7084/srep27288-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/81db7e480187/srep27288-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/b8189c2611a2/srep27288-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9098/4890122/1bae712aff76/srep27288-f8.jpg

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