Facile route to ultraflat SAM-protected gold surfaces by "amphiphile splitting"
Facile route to ultraflat SAM-protected gold surfaces by "amphiphile splitting"
复制标题
DOI：
10.1002/anie.200352249
复制
发表时间：
2004-01-01
影响因子：
16.6
通讯作者：
Ulman, A
中科院分区：
文献类型：
--
作者：
Gupta, P;Loos, K;Ulman, A
近年来，有机分子的自组装单分子膜（SAMs）[1]引起了人们的广泛关注，并在生物传感器等领域得到了应用。[2]纳米材料[3]分子开关。[4]在许多情况下，这些器件的功能取决于SAM的表面性质。这些性质，包括润湿性和粘附性，直接来自SAM-空气界面处的基团的性质、单分子膜的组成和它们的堆积。已知更平滑的表面通常导致更均匀和更密集地堆积的SAM。[5]多晶金属衬底的一个显著缺点是用于表征薄膜的重要仪器工具，例如扫描隧道显微镜（STM）和扫描探针显微镜（SPM），不能提供SAM结构的有用图像，因为这些SAM的分子结构与衬底（通常是金）的形貌交织在一起。因此，使用具有在几微米的面积上延伸的原子尺度上的光滑度的基底（特别是Au和Ag表面）是将分子布置成目标结构的先决条件。
Self-assembled monolayers (SAMs) of organic molecules [1] have drawn much attention in recent years and find application in, for example, biosensors.[2] nanomaterials,[3] molecular switches.[4] The functioning of these devices depends, in many cases, on the surface properties of the SAM. These properties, including wetting and adhesion, result directly from properties of the groups at the SAM–air interface, the composition of the monolayers, and their packing. It is known that smoother surfaces typically result in more uniform and densely packed SAMs.[5]One significant drawback of polycrystalline metal substrates is that important instrumental tools for characterizing thin films, for instance, scanning tunneling microscopy (STM) and scanning probe microscopy (SPM), do not provide useful images of SAM structures, because the molecular structure of these SAMs is intertwined with the topography of the substrate (typically gold). The use of substrates (especially Au and Ag surfaces) with smoothness on the atomic scale extending over an area of several micrometers is, therefore, a prerequisite for arranging molecules into targeted architectures.