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Assembly of PCBM and tn-ZnPc Molecular Domains and Phase Separation of Molecular Mixtures from Liquid Solution on Si(111)
Langmuir ( IF 3.7 ) Pub Date : 2017-11-14 00:00:00 , DOI: 10.1021/acs.langmuir.7b03233
Miriam Cezza 1 , Colin S. Qualters 1 , Raymond J. Phaneuf 1
Affiliation  

We present the results of investigations aimed at understanding the mechanisms by which small, mutually immiscible organic molecules self-assemble into domains during phase separation from liquid solutions in the presence of a solid substrate. As an example system, we investigated molecular mixtures of tetranitro zinc-phthalocyanine (tn-ZnPc), an electron donor, and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), an electron acceptor, in chloroform solution, deposited onto native oxide-covered Si(111) substrates. We found qualitatively different behavior in the formation of domains of the two types of molecules, seemingly because of a large difference in their solubilities in the solvent. The morphology of PCBM molecule domains varies widely depending on the solvent evaporation rate, the presence/absence of tn-ZnPc molecules in the solution, solvent annealing conditions, and seemingly the presence/absence of trace impurities. By contrast, we find evidence that the shape of the tn-ZnPc domains is insensitive to evaporation; these form while in liquid suspension, and the assembly of domains into clusters varies according to the rate and mode of solvent evaporation.

中文翻译:

Si(111)上PCBM和tn-ZnPc分子域的组装以及液相混合物中分子混合物的相分离

我们目前的调查结果旨在了解机制,在存在固体基质的情况下,从液体溶液中进行相分离时,相互之间不混溶的小有机分子会自组装成畴。作为一个示例系统,我们研究了电子供体四硝基锌-酞菁(tn-ZnPc)和[6,6]-苯基-C 61的分子混合物-丁酸甲酯(PCBM),一种电子受体,在氯仿溶液中沉积在天然氧化物覆盖的Si(111)衬底上。我们发现这两种分子的结构域在质量上有不同的行为,这似乎是由于它们在溶剂中的溶解度差异很大。PCBM分子域的形貌变化很大,具体取决于溶剂的蒸发速率,溶液中是否存在tn-ZnPc分子,溶剂退火条件以及表面上是否存在微量杂质。相比之下,我们发现证据表明tn-ZnPc域的形状对蒸发不敏感。它们在液体悬浮液中时会形成,并且根据溶剂蒸发的速率和模式,将域组装成簇的方式也会有所不同。
更新日期:2017-11-15
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