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首页> 外文期刊>Journal of Oleo Science >Lithography of Self-assembled Semiconductor Quantum Dots on Templates Fabricated from Mixed Langmuir-Blodgett Films
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Lithography of Self-assembled Semiconductor Quantum Dots on Templates Fabricated from Mixed Langmuir-Blodgett Films

机译：自混合Langmuir-Blodgett薄膜制备的模板上自组装半导体量子点的光刻

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摘要

In this paper, we discuss a useful technique to fabricate patterned single layers consisting of quantum dots on two-dimensional templates fabricated from phase-separated mixed Langmuir-Blodgett (LB) films. The phase-separated structures are governed by two competing interactions-line tension and dipole-dipole interaction-and are tunable by adjusting the intermolecular interactions between the film-forming molecules and the fabrication conditions. The templates can be fabricated from mixed LB films containing silane-coupling agents, which form covalent bonds with Si wafers. The CdS- or CdSe/ZnS-nanoparticles were immobilized on the templates using a chemisorption technique. The samples were analyzed using ultraviolet-visible absorption spectroscopy, emission spectroscopy, atomic force microscopy, scanning electron microscopy, and fluorescence microscopy. The diameters of the CdS-NPs and CdSe/ZnS were estimated to be about 2.6 and 4.5 nm, respectively, using the Brus equation. We successfully obtained a patterned single layer consisting of quantum dots on the templates. The density of the immobilized-CdSe/ ZnS-NPs on these templates can be controlled through variations in the concentration of the aqueous dispersion of CdSe/ZnS-NPs. Fluorescence observations indicate that the immobilized-CdSe/ZnS-NPs on the templates serve as light-emitting devices. These results indicate that patterned quantum dots can be formed only through self-assembly processes.
机译：在本文中，我们讨论了一种有用的技术，该技术可在由相分离的混合Langmuir-Blodgett（LB）薄膜制成的二维模板上制造由量子点组成的图案化单层。相分离结构受两种相互竞争的相互作用所控制，即线张力和偶极-偶极相互作用，并且可以通过调节成膜分子与制备条件之间的分子间相互作用来调节。模板可以由包含硅烷偶联剂的混合LB薄膜制成，该薄膜与Si晶片形成共价键。使用化学吸附技术将CdS-或CdSe / ZnS-纳米颗粒固定在模板上。使用紫外可见吸收光谱，发射光谱，原子力显微镜，扫描电子显微镜和荧光显微镜对样品进行分析。使用Brus方程，CdS-NP和CdSe / ZnS的直径分别估计为约2.6和4.5nm。我们成功地在模板上获得了由量子点组成的图案化单层。这些模板上固定化的CdSe / ZnS-NPs的密度可以通过改变CdSe / ZnS-NPs水分散液的浓度来控制。荧光观察表明，模板上固定的CdSe / ZnS-NPs可用作发光器件。这些结果表明图案化的量子点只能通过自组装过程形成。

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