MOLECULAR-LEVEL CONTROL OVER SURFACE ORDER IN SELF-ASSEMBLED MONOLAYER FILMS OF THIOLS ON GOLD
MOLECULAR-LEVEL CONTROL OVER SURFACE ORDER IN SELF-ASSEMBLED MONOLAYER FILMS OF THIOLS ON GOLD
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DOI：
10.1126/science.240.4848.62
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发表时间：
1988-04-01
期刊：
影响因子：
56.9
通讯作者：
WHITESIDES, GM
中科院分区：
文献类型：
--
作者：
BAIN, CD;WHITESIDES, GM
长链ω-羟基烷硫醇[HS（CH 2）nOH]通过硫原子与金表面配位，并产生有序的亲水性单层，其中羟基暴露在外表面。两个ω-的共吸附不同链长n的羟基链烷硫醇导致形成具有无序表面区域的单层，该无序表面区域的亲水性明显低于由任一纯化合物形成的均匀羟基表面。通过控制单层的组成，也可以同时控制表面的有序度和亲水性。在单分子膜含有的混合物的烷醇组分，这些组分显然没有相分离成宏观岛，但分散在分子尺度上。
Long-chain .omega.-hydroxyalkanethiols [HS(CH2)nOH] coordinate to gold surfaces through the sulfur atom and produce ordered, hydrophilic monolayers in which the hydroxyl groups are exposed at the outer surface. Coadsorption of two .omega.-hydroxyalkanethiols of different chain lengths n resulted in the formation of a monolayer having a disordered surface region that was markedly less hydrophilic than the homogeneous, hydroxylic surface formed from either pure compound. By controlling the composition of the monolayer, it was also possible to control simultaneously the degree of order in the surface and its hydrophilicity. In the monolayers containing a mixture of alkanethiol components, these components apparently did not phase-segregate into macroscopic islands, but were dispersed on a molecular scale.