Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.
Chem Commun (Camb). 2018 Oct 16;54(83):11709-11712. doi: 10.1039/c8cc06466k.
Modified long-chain alkanes are often used to functionalize graphene and MoS2 noncovalently, with the goal of controlling the substrate electronic structure or interactions with the environment. Alkyl chain adsorption enthalpy is lower on MoS2 than on graphite; the decreased molecule-substrate interaction strength suggests utility for monolayer structures that increase stability through other means. Previously, we have found that diyne phospholipid monolayers on HOPG are more stable toward solution processing than monolayers of single-chain amphiphiles. Here, we show that this is also true for assembly on MoS2, but that the additional stability appears to arise from edge-on adsorption, producing monolayers in which alkyl chains form two stacked layers on the substrate.
经修饰的长链烷烃常用于非共价功能化石墨烯和 MoS2，目的是控制基底的电子结构或与环境的相互作用。烷基链在 MoS2 上的吸附焓低于石墨；分子-基底相互作用强度的降低表明，对于通过其他方式增加稳定性的单层结构具有实用性。此前，我们发现 HOPG 上的二炔磷脂单层在溶液处理方面比单链两亲物的单层更稳定。在这里，我们表明对于在 MoS2 上的组装也是如此，但额外的稳定性似乎来自于侧式吸附，形成了在基底上形成两层堆叠烷基链的单层。
