Layer-by-Layer Assembly of Two-Dimensional Colloidal Cu2Se Nanoplates and Their Layer-Dependent Conductivity

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• 作者：Yue Zhu ; Lele Peng ; Weinan Zhu ; Deji Akinwande ; Guihua Yu
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：June 28, 2016
• 年：2016
• 卷：28
• 期：12
• 页码：4307-4314
• 全文大小：531K
• 年卷期：0
• ISSN：1520-5002

文摘

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 of electron transport inside 2D ordered matrix.