Substrate templating upon self-assembly of hydrogen-bonded molecular networks on an insulating surface.

Substrate templating upon self-assembly of hydrogen-bonded molecular networks on an insulating surface.
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绝缘表面上氢键分子网络自组装的基板模板

DOI:
10.1002/smll.201200681
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发表时间:
2012
期刊:
影响因子:
13.3
通讯作者:
Angelika Kühnle
Angelika Kühnle
中科院分区:
材料科学1区
文献类型:
--
作者:
Philipp Rahe;Markus Nimmrich;Angelika Kühnle

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绝缘表面上的分子自组装尽管与许多应用高度相关,但通常会受到介电表面上存在的弱分子-表面相互作用的影响,特别是在以金属基材为基准时。因此,要充分发挥分子自组装的潜力,增强底物的影响力是必要的前提。对苯二甲酸和均苯三酸沉积到方解石的天然解理面上后,形成扩展的氢键网络,从而润湿基材。观察到的结构复杂性与金属表面上实现的多样性相匹配。对方解石上观察到的分子结构的详细分析揭示了底层基材的显着影响,清楚地表明表面对所得分子网络的显着模板效应。这项工作表明,即使在通常弱相互作用的绝缘表面的情况下,选择合适的分子/基底系统也可以调整分子间和分子-表面相互作用之间的平衡。因此,这项研究提供了一种有意利用基板模板来增加室温下体绝缘体上分子自组装的结构多样性的策略。
Molecular self‐assembly on insulating surfaces, despite being highly relvant to many applications, generally suffers from the weak molecule–surface interactions present on dielectric surfaces, especially when benchmarked against metallic substrates. Therefore, to fully exploit the potential of molecular self‐assembly, increasing the influence of the substrate constitutes an essential prerequisite. Upon deposition of terephthalic acid and trimesic acid onto the natural cleavage plane of calcite, extended hydrogen‐bonded networks are formed, which wet the substrate. The observed structural complexity matches the variety realized on metal surfaces. A detailed analysis of the molecular structures observed on calcite reveals a significant influence of the underlying substrate, clearly indicating a substantial templating effect of the surface on the resulting molecular networks. This work demonstrates that choosing suitable molecule/substrate systems allows for tuning the balance between intermolecular and molecule–surface interactions even in the case of typically weakly interacting insulating surfaces. This study, thus, provides a strategy for deliberately exploiting substrate templating to increase the structural variety in molecular self‐assembly on a bulk insulator at room temperature.
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