Physics and Chemistry of Nanostructures, Ghent University, Krijgslaan 281-S3, 9000 Gent, Belgium.
Langmuir. 2010 Jun 1;26(11):7732-6. doi: 10.1021/la904474h.
The application of colloidal nanocrystals in various devices requires their assembly into well-defined mono- or multilayers. We explore the possibilities of the Langmuir-Schaefer technique to make such layers, using CdSe quantum dots as a model system. The layer quality is assessed using atomic force microscopy, transmission electron microscopy, and UV-vis absorption spectroscopy. For hydrophobic substrates, we find that the Langmuir-Schaefer technique is an excellent tool for controlled multilayer production. With hydrophilic substrates, dewetting induces a cellular superstructure. Combination with photolithography leads to micropatterned multilayers, and combination of different nanocrystal sizes allows for the formation of 2D binary superstructures.
胶体纳米晶体在各种器件中的应用需要将其组装成具有明确定义的单层或多层。我们探索了使用 Langmuir-Schaefer 技术来制备这种层的可能性，使用 CdSe 量子点作为模型系统。使用原子力显微镜、透射电子显微镜和紫外可见吸收光谱评估了层的质量。对于疏水性基底，我们发现 Langmuir-Schaefer 技术是控制多层生产的极好工具。对于亲水性基底，去湿会导致形成蜂窝状超结构。与光刻相结合可以得到图案化的多层结构，而不同纳米晶体尺寸的组合可以形成二维二元超结构。
