Adjusting Fermi Level of Graphene by Controlling the Linker Lengths of Dipolar Molecules,Langmuir

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Adjusting Fermi Level of Graphene by Controlling the Linker Lengths of Dipolar Molecules
Langmuir ( IF 3.7 ) Pub Date : 2019-04-05 00:00:00 , DOI: 10.1021/acs.langmuir.8b03953
Mingjia Zhang ₁ , Jiaojiao Yu ₁ , Jianjiang He ₁ , Changshui Huang ₁

Affiliation

Graphene modified by azo molecules has attracted much attention due to its promising graphene-enhanced Raman scattering (GERS) effect. Herein, we achieved the shortened distance between the dipole moment and graphene, by reducing the number of methylene groups and the chain length, and studied the Raman scattering in dipolar molecules/graphene hybrids. Whether for low or high concentrations, a more significant GERS signal can be observed, which can be attributed to the effective modulation of the dipole moment on interface energy level matching. Further, by fabricating FET devices, we demonstrate more obvious p-type and n-type doping in graphene that is affected by the chain length of the azobenzene molecule. On the basis of the dependence of the G band shift on the Fermi surface change, we further reveal the important role of dipole moment distance in dipolar molecules/graphene hybrids. These studies provide a new approach to optimize the interface matching between azobenzene and graphene and may help achieve more sensitive GERS detection.

中文翻译：

通过控制偶极分子的连接子长度来调节石墨烯的费米能级

偶氮分子修饰的石墨烯因其有前途的石墨烯增强拉曼散射（GERS）效应而备受关注。在本文中，我们通过减少亚甲基的数目和链长来缩短了偶极矩与石墨烯之间的距离，并研究了偶极分子/石墨烯杂化物中的拉曼散射。无论是低浓度还是高浓度，都可以观察到更显着的GERS信号，这可以归因于界面能级匹配对偶极矩的有效调制。此外，通过制造FET器件，我们证明了石墨烯中更明显的p型和n型掺杂受偶氮苯分子链长的影响。根据G带移动对费米表面变化的依赖性，我们进一步揭示了偶极矩距离在偶极分子/石墨烯杂化体中的重要作用。这些研究为优化偶氮苯和石墨烯之间的界面匹配提供了一种新方法，并可能有助于实现更灵敏的GERS检测。

更新日期：2019-04-05

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