柔性聚合物衬底上单层二维原子晶体的软接触摩擦制备及机理研究

柔性聚合物衬底上二维原子晶体的“直接”（即“无需转移”）制备方法对于柔性光电子学等领域的发展具有重要意义。申请人前期提出软接触摩擦法，初步实现了室温下在柔性衬底上快速“直接”制备多种多层二维原子晶体的目标（原子层数2至10层），但机理尚不清晰，且不能实现单层二维原子晶体的制备。本项目拟以制备过程中特定匹配介质的表面特性和二维层状材料的本征特性等为切入点，重点研究它们对二维原子晶体微观性状及宏观光电性能的影响等关键问题，实现单层二维原子晶体在柔性衬底上的软接触摩擦制备，并阐明机理。本项目将发展出一种能在柔性衬底上“直接”制备多种单层二维原子晶体的方法，避免“转移”环节，并弥补现有 “直接”制备方法仅适合某种单层二维原子晶体（如仅适合单层石墨烯或仅适合单层二硫化钼等）的局限，以及难以适应柔性衬底的不足。研究结果对常见单层二维原子晶体（单层石墨烯、单层六方氮化硼、单层二硫化钼/钨等）具有普适性。

The direct (“transfer-free”) fabrication methods of two-dimensional (2-D) atomic crystals on flexible polymer substrates are very important for the development of areas such as flexible opto-electronics. The applicant previously proposed soft contact rubbing method, and had preliminarily achieved the rapid fabrication of few-layer 2-D atomic crystals (with 2 to 10 atomic layers) “directly” on flexible substrates under room temperature. However, the current soft contact rubbing method could not achieve the fabrication of mono-layer 2-D atomic crystals on flexible substrates, and the physical mechanisms are not yet clear. This project intends to research on the surface properties of specific matching medias and the intrinsic characteristics of 2-D layered materials, especially the important issues of their influence on the micro-characters and typical opto-electronic properties of 2-D atomic crystals. Through these researches, this project will achieve the fabrication of mono-layer 2-D atomic crystals on flexible substrates by soft contact rubbing method, and will clarify the physical mechanisms. This project will develop a method which can fabricate mono-layer 2-D atomic crystals “directly” on flexible substrates, thus avoids the "transfer" steps, and compensates the current limitation of the existing “direct” fabrication methods that they can only be suited for one kind of mono-layer 2-D atomic crystals (such as mono-layer graphene only or mono-layer molybdenum/tungsten disulfides only), and difficult to be applied to flexible substrates. The results should have the universality for various kinds of common mono-layer 2-D atomic crystals, including mono-layer graphene, mono-layer hexagonal boron nitrides, and mono-layer molybdenum/tungsten disulfides.