Abstract

Colloidal assembly is one of the highly active areas in nanoscale science and technology as it plays an important role in organizing nanoscale building blocks into hierarchical and functional systems for practical applications. Here, we report large scale assemblies of two-dimensional (2D) Cu2Se nanoplates synthesized by a microwave-assisted polyol method with careful phase control. Thin films of Cu2Se were obtained via the Langmuir–Blodgett (LB) method in a layer-by-layer manner. Interestingly, despite the decrease in volume fraction of Cu2Se as layer number increases, the films show an increasing trend in conductivity. We propose a “layer-dependent conducting-bridge” (LDCB) model considering density of conducting points and possible defects, and the simulated trend of conductivity exhibits a corresponding match with experimental measurements. Our study serves as an important extension of colloidal assembly in 2D nanostructures, and the proposed conductivity model provides insights into the understanding...

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