Self-assembled monolayers (SAMs) of omega-(4'-methylbiphenyl-4-yl) alkanethiols CH3(C6H4)(2)(CH2)(n)SH (BPn, n = 3 and 4) on Au(111) substrates were studied using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). Preparation at elevated temperature results in highly ordered layers with large domains. Whereas the (2root3 x root3) structure of the BP3 SAMs is similar to that reported previously for other aromatic thiols SAMs made from BP4 exhibit a very different structure. A (5root3 x 3)rect unit cell containing 8 molecules is found which corresponds to a packing density reduced by 25% compared to that of BP3. The odd-even effect observed in the molecularly resolved STM images of BP3 and BP4, therefore, confirms the pronounced influence of the spacer chain on the structure of these biphenylbased SAMs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据