Folded Nanosheets: A New Mechanism for Nanodisk Formation

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• 作者：Suresh Sarkar ; Alice D. P. Leach ; Janet E. Macdonald
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：June 28, 2016
• 年：2016
• 卷：28
• 期：12
• 页码：4324-4330
• 全文大小：586K
• 年卷期：0
• ISSN：1520-5002

文摘

Two-dimensional (2D) nanostructures have generated significant interest in the scientific community as a result of their high surface area and remarkable optoelectronic properties. In this work, we present a simple colloidal synthesis for ultrathin nanosheets of both In₂S₃ and CuInS₂. Contradictory phase designations exist for In₂S₃ at the nanoscale as a result of overlapping reflections from multiple phases in X-ray diffraction. We use high-resolution transmission electron microscopy to demonstrate definitively that hexagonal γ-In₂S₃ is formed. Continued heating of these nanostructures results in the formation of nanodisks twice the thickness of the original structure via folding and tearing of the intermediate sheet. Treatment of the In₂S₃ nanosheet with Cup>+p> accelerates this process of tearing of the nanosheet of In₂S₃ and results in the formation of one-dimensional nanoribbons of CuInS₂. High-resolution transmission electron microscopy images and medium-angle X-ray scattering measurements indicate that these nanoribbons consist of face-to-face stacked nanodisks.