Marino Emanuele, Jiang Zhiqiao, Kodger Thomas E, Murray Christopher B, Schall Peter
Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands.
Department of Chemistry, University of Pennsylvania, 231 S. 34th St., 19104 Philadelphia, (Pennsylvania), United States.
Langmuir. 2023 Sep 12;39(36):12533-12540. doi: 10.1021/acs.langmuir.3c00933. Epub 2023 Aug 10.
We assemble semiconductor CdSe nanoplatelets (NPs) at the air/liquid interface into 2D monolayers several micrometers wide, distinctly displaying nematic order. We show that this configuration is the most favorable energetically and that the edge-to-edge distance between neighboring NPs can be tuned by ligand exchange without disrupting film topology and nanoparticle orientation. We explore the rich assembly phase space by using depletion interactions to direct the formation of 1D nanowires from stacks of NPs. The improved control and understanding of the assembly of semiconductor NPs offers opportunities for the development of cheaper optoelectronic devices that rely on 1D or 2D charge delocalization throughout the assembled monolayers and nanowires.
我们在气/液界面将半导体硒化镉纳米片（NPs）组装成宽度达几微米的二维单层膜，明显呈现向列相序。我们表明这种构型在能量上是最有利的，并且相邻纳米片之间的边到边距离可以通过配体交换进行调节，而不会破坏薄膜拓扑结构和纳米颗粒的取向。我们利用耗尽相互作用来引导由纳米片堆叠形成一维纳米线，从而探索丰富的组装相空间。对半导体纳米片组装的更好控制和理解为开发更便宜的光电器件提供了机会，这些器件依赖于在整个组装的单层膜和纳米线中进行一维或二维电荷离域。
