Assembling Nanoparticle Arrays at Fluid Interfaces

CBET -1603043 PI：赫尔曼，欧文P。制造电子、传感器、太阳能电池和其他设备新材料的一种途径是将纳米粒子组装成有序结构。 该项目将开发在液体和空气之间的界面处将纳米颗粒组装成二维单层的新方法。 该项目将使用氧化铁纳米颗粒和半导体纳米晶体，这些通常用于重要的技术应用。 为了控制和调整组装过程，纳米颗粒将被涂覆影响颗粒之间相互作用的化合物。 将使用各种方法研究化合物对颗粒单层形成的影响、单层内颗粒之间的距离以及所得单层的特性。 该项目中的方法是通用的，因此结果应该适用于在液体表面上形成各种二维组件，然后可以将其转移到固体表面。 由此产生的材料可用于涉及光和电传导的技术。 该项目将为所有学术水平的学生提供参与研究的机会，该项目的参与者将在哈莱姆STM博览会上为儿童和成人举办材料和工程演示。该项目的目标是使用建模和新的实验方法相结合的方法，使有序的两个-三维纳米粒子单层，充分利用了纳米粒子的独特和可调性能。 将探索一种新的途径，使用可混溶的液体形成单层，以确定是否可以形成的结构，不能用标准方法获得。 将合成配体封端的纳米粒子，并通过X射线衍射、吸收光谱和透射电子显微镜进行表征。 将确定纳米颗粒核的尺寸、多分散性和配体组成。 将使用真实的时间显微镜来跟踪纳米颗粒在界面处形成单层。 由于纳米粒子的物理耦合可以与它们的电子耦合相关联，因此将对所制造的结构进行电学和光学测量，并将其与制造过程的细节相关联。 建模将被用来检查纳米粒子在界面处的有序性的演变，以及随着周围液体的蒸发而产生的结构的动力学和性质。 最后，将开发将所得纳米颗粒层转移到固体基底上的方法，同时监测单层性质。

CBET - 1603043PI: Herman, Irving P.One route to making new materials for electronics, sensors, solar cells and other devices is to assemble nanoparticles into ordered structures. This project will develop new ways of assembling nanoparticles into two-dimensional monolayers at interfaces between liquid and air. The project will use iron oxide nanoparticles and semiconductor nanocrystals, which are often used in important technological applications. To control and tune the assembly process, the nanoparticles will be coated with chemical compounds that influence interactions among the particles. The effect of the compounds on the formation of a particle monolayer, the distances between particles within the monolayer, and characteristics of the resulting monolayer will be investigated using a variety of methods. The approaches in the project are general, so results should apply to the formation of a wide range of two-dimensional assemblies on liquid surfaces, which can then be transferred to solid surfaces. The resulting materials can be used in technologies involving light and electrical conduction. The project will provide opportunities for students at all academic levels to participate in research, and participants in the project will host materials and engineering demonstrations for children and adults in the Harlem STM Expo.This goal of this project is to use a combination of modeling and new experimental approaches to enable the rational design of ordered two-dimensional nanoparticle monolayers that takes full advantage of the unique and tunable properties of nanoparticles. A new route to monolayer formation using miscible liquids will be explored to determine if structures can be formed that cannot be obtained with standard methods. Nanoparticles capped with ligands will be synthesized and characterized by x-ray diffraction, absorption spectra and transmission electron microscopy. The size of the nanoparticle core, polydispersity, and ligand composition will be determined. Real time microscopy will be used to track the formation of the nanoparticles into monolayers at interfaces. Since physical coupling of nanoparticles can be linked to their electronic coupling, electrical and optical measurements of the fabricated structures will be conducted and correlated with details of the fabrication procedures. Modeling will be used to examine the evolution of nanoparticle ordering at interfaces and the dynamics and properties of the resulting structures as surrounding liquid evaporates. Finally, methods of transferring the resulting nanoparticle layer to a solid substrate, while monitoring monolayer properties, will be developed.