Nanoscale tailoring of supramolecular crystals via an oriented external electric field.
Nanoscale tailoring of supramolecular crystals via an oriented external electric field.
复制标题
通过定向外部电场对超分子晶体进行纳米级定制。
作者：
Xingming Zeng;S. B. Khan;Ayyaz Mahmood;Shern
近年来，扫描隧道显微镜（STM）的定向外电场被用于控制表面的化学反应和超分子相变。然而，迄今为止，尚未实现使用这种电场用于晶体工程的先进控制。在这里，我们提出了如何利用STM的定向电场来利用固体表面上的超分子结晶。我们发现，一个玻璃状的随机平铺组装组成的p-terphenyl-3，5，3 '，5'-tetracarboxylic acid可以转化为紧密堆积的周期性组件在正衬底偏压条件下，在液/固界面。重要的是，这种场诱导产物的成核和随后的晶体生长可以在早期以实时方式人工定制。通过这种方法，我们能够产生一个二维的超分子单晶。所制备的具有表观亮度的晶体归因于与电子态密度相关的光谱特征，因此强烈依赖于STM偏置。
The oriented external electric field of a scanning tunneling microscope (STM) has recently been adapted for controlling the chemical reaction and supramolecular phase transition at surfaces with molecular precision. However, to date, advance controls using such electric-fields for crystal engineering have not been achieved yet. Here, we present how the directional electric-field of an STM can be utilized to harness supramolecular crystallization on a solid surface. We show that a glass-like random-tiling assembly composed of p-terphenyl-3,5,3',5'-tetracarboxylic acid can transform into close-packed periodic assemblies under positive substrate bias conditions at the liquid/solid interface. Importantly, the nucleation and subsequent crystal growth for such field-induced products can be artificially tailored at the early stage in a real-time fashion. Through this method, we were able to produce a two-dimensional supramolecular single crystal. The as-prepared crystals with apparent brightness are ascribed to a spectroscopic feature linked to the electron density of states, which is thus strongly STM bias dependent.
电化学界面稀土金属三层夹层复合物吸附层的超结构形成和重排。
DOI：
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发表时间：
2007
期刊：
Angew. Chem. Int. Ed. 46
影响因子：
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作者：
D.;Ida;T.;Yoshizaki;S.Yoshimoto et al.
通讯作者：
S.Yoshimoto et al.