A simple and effective method for direct exfoliation of tungsten diselenide (WSe₂) into few-layered nanosheets has been successfully developed by employing a low molecular weight adenine-functionalized supramolecular polymer (A-PPG). In this study, we discover A-PPG can self-assemble into a long-range, ordered lamellar microstructure on the surface of WSe₂ due to the efficient non-covalent interactions between A-PPG and WSe₂. Morphological and light scattering studies confirmed the dynamic self-assembly behavior of A-PPG has the capacity to efficiently manipulate the transition between contractile and extended lamellar microstructures on the surface of metallic 1T-phase and semiconducting 2H-phase WSe₂ nanosheets, respectively. The extent of WSe₂ exfoliation can be easily controlled by systematically adjusting the amount of A-PPG in the composites, to obtain nanocomposites with the desired functional characteristics. In addition, the resulting composites possess unique liquid–solid phase transition behavior and excellent thermoreversible properties, revealing the self-assembled lamellar structure of A-PPG functions as a critical factor to manipulate and tailor the physical properties of exfoliated WSe₂. This newly developed method of producing exfoliated WSe₂ provides a useful conceptual and potential framework for developing WSe₂-based multifunctional nanocomposites to extend their application in solution-processed semiconductor devices.

中文翻译：

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动态二硒化钨纳米材料：超分子组装诱导的剥离二维纳米片上的结构转变†

采用低分子量腺嘌呤功能化超分子聚合物（A-PPG）成功开发了一种简单有效的将二硒化钨（WSe _{2 ）直接剥离成多层纳米片的方法。在这项研究中，我们发现由于 A-PPG 和 WSe 2}之间的有效非共价相互作用，A-PPG 可以在WSe ₂表面自组装成长程有序的层状微结构。形态学和光散射研究证实，A-PPG 的动态自组装行为能够有效控制金属 1T 相和半导体 2H 相 WSe _{2表面上的收缩和扩展层状微结构之间的转变}纳米片，分别。通过系统地调节复合材料中A-PPG的含量，可以很容易地控制WSe _{2的剥离程度，从而获得具有所需功能特性的纳米复合材料。}此外，所得复合材料具有独特的液固相变行为和优异的热可逆性能，揭示了 A-PPG 的自组装层状结构是操纵和调整剥离的 WSe ₂物理性能的关键因素。这种新开发的生产剥离 WSe 2 的方法为开发 WSe _2提供了有用的概念和潜在框架基多功能纳米复合材料，以扩展其在溶液处理半导体器件中的应用。