Langmuir-Blodgett films.
Langmuir-Blodgett films.
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DOI：
10.1126/science.8134836
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发表时间：
1994-03
期刊：
影响因子：
56.9
通讯作者：
J. Zasadzinski;R. Viswanathan;L. Madsen;J. Garnæs;D. K. Schwartz
中科院分区：
文献类型：
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作者：
J. Zasadzinski;R. Viswanathan;L. Madsen;J. Garnæs;D. K. Schwartz
两亲分子的有序单层从空气-水界面到固体基质的受控转移是创造新材料的第一个分子尺度技术。然而，朗缪尔和布洛杰特在20世纪30年代设想的技术的潜在好处尚未完全实现。可再现性和缺陷的问题以及对薄膜中复杂分子的堆积缺乏基本理解一直阻碍着Langmuir-Blodgett膜和由这种膜制成的器件的实际应用。然而，现代高分辨率X射线衍射和扫描探针显微镜已被证明是解决许多涉及有机薄膜的基本问题的理想工具。在这里，研究提出的分子顺序和组织在薄膜的脂肪酸盐，原型系统的凯瑟琳Blodgett。即使是这些相对简单的系统，目前的液体，六角晶系，和晶体秩序;货车德瓦尔斯和应变层外延在各种基板上;广泛的变化，晶体对称性和界面面积与抗衡离子;调制的超结构;和共存的晶格结构。各种各样的可能的结构，提出了一个挑战和未来的有机薄膜器件的分子设计的机会。
The controlled transfer of organized monolayers of amphiphilic molecules from the airwater interface to a solid substrate was the first molecular-scale technology for the creation of new materials. However, the potential benefits of the technology envisioned by Langmuir and Blodgett in the 1930s have yet to be fully realized. Problems of reproducibility and defects and the lack of basic understanding of the packing of complex molecules in thin films have continued to thwart practical applications of Langmuir-Blodgett films and devices made from such films. However, modern high-resolution x-ray diffraction and scanning probe microscopy have proven to be ideal tools to resolve many of the basic questions involving thin organic films. Here, studies are presented of molecular order and organization in thin films of fatty acid salts, the prototypical system of Katharine Blodgett. Even these relatively simple systems present liquid, hexatic, and crystalline order; van der Waals and strained layer epitaxy on various substrates; wide variations in crystal symmetry and interfacial area with counterions; modulated superstructures; and coexisting lattice structures. The wide variety of possible structures presents both a challenge and an opportunity for future molecular design of organic thin-film devices.