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首页> 外文期刊>Chinese science bulletin >Structural study of poly (methyl methacrylate) Langmuir-Blodgett monolayers by atomic force microscopy
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Structural study of poly (methyl methacrylate) Langmuir-Blodgett monolayers by atomic force microscopy

机译：原子力显微镜研究聚甲基丙烯酸甲酯Langmuir-Blodgett单层的结构

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Direct imaging of ultrathin organic films on solid surfaces is important for a variety of reasons; in particular, the use of such films as ultrathin resists for nanometer scale fabrication and information recording requires the understanding of theirmicrostructure. However, few studies have been carried out because it is difficult to observe ultrathin organic films at the molecular level using conventional analytical methods. Recently, scanning tunneling microscopy (STM) and atomic force microscopy(AFM) have proved to be promising techniques for the microscopic characterization of the molecular structures of ultrathin organic films, including Langmuir-Blodgett (LB) films due to their atomic level resolution. In the previous work, we have investigated the polyimide monolayer LB films by AFM, The polymer chain has directly been observed at a molecular scale. Additionally, it was found that the polyimide chains were always elongated and aligned in a two-dimensional LB system due to the inducing of dipping process, As an extension of this study, here we will report the investigations of another polymer (PMMA) LB films using AFM. Our AFM images demonstrate the further capability to reveal the surface morphology of polymer LB films and detailed molecular chain feature. The experimental results indicate that the PMMA polymer chain not only forms a long-range ordered orientation, but also twists on itself. As we know, this is the first time that the twisted chain structure in polymer LB films has directly been observed by AFM at a molecular scale.
机译：由于多种原因，直接在固体表面上超薄有机膜成像很重要。特别地，将此类膜用作超薄抗蚀剂用于纳米级制造和信息记录需要了解其微观结构。然而，由于使用常规分析方法难以在分子水平观察超薄有机膜，因此很少进行研究。最近，由于其原子水平的分辨率，扫描隧道显微镜（STM）和原子力显微镜（AFM）已被证明是对超薄有机膜（包括Langmuir-Blodgett（LB）膜）的分子结构进行微观表征的有前途的技术。在以前的工作中，我们已经通过AFM研究了聚酰亚胺单层LB膜，直接在分子尺度上观察到了聚合物链。此外，还发现由于浸渍过程的诱导，聚酰亚胺链在二维LB系统中总是伸长和排列。作为这项研究的扩展，我们将在此报道另一种聚合物（PMMA）LB膜的研究。使用AFM。我们的AFM图像证明了进一步揭示聚合物LB膜的表面形态和详细的分子链特征的能力。实验结果表明，PMMA聚合物链不仅形成长程有序取向，而且自身扭曲。众所周知，这是首次通过AFM在分子尺度上直接观察到聚合物LB膜中的扭曲链结构。

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