Gold nanoparticle-mediated non-covalent functionalization of graphene for field-effect transistors,Nanoscale Advances

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Gold nanoparticle-mediated non-covalent functionalization of graphene for field-effect transistors
Nanoscale Advances ( IF 4.6 ) Pub Date : 2021-1-8 , DOI: 10.1039/d0na00603c
Dongha Shin ₁ , Hwa Rang Kim _{2,

3} , Byung Hee Hong _{2,

3}

Affiliation

Since its discovery, graphene has attracted much attention due to its unique electrical transport properties that can be applied to high-performance field-effect transistors (FETs). However, mounting chemical functionalities onto graphene inevitably involves the breaking of sp² bonds, resulting in the degradation of the mechanical and electrical properties compared to pristine graphene. Here, we report a new strategy to chemically functionalize graphene for use in FETs without affecting the electrical performance. The key idea is to control the Fermi level of the graphene using the consecutive treatment of gold nanoparticles (AuNPs) and thiol-SAM (self-assembled monolayer) molecules, inducing positive and negative doping effects, respectively, by flipping the electric dipoles between AuNPs and SAMs. Based on this method, we demonstrate a Dirac voltage switcher on a graphene FET using heavy metal ions on functionalized graphene, where the carboxyl functional groups of the mediating SAMs efficiently form complexes with the metal ions and, as a result, the Dirac voltage can be positively shifted by different charge doping on graphene. We believe that the nanoparticle-mediated SAM functionalization of graphene can pave the way to developing high-performance chemical, environmental, and biological sensors that fully utilize the pristine properties of graphene.

中文翻译：

金纳米颗粒介导的场效应晶体管石墨烯非共价功能化

自发现以来，石墨烯因其独特的电传输特性而备受关注，可应用于高性能场效应晶体管（FET）。然而，将化学官能团安装到石墨烯上不可避免地涉及sp ²键的断裂，导致与原始石墨烯相比机械和电性能的下降。在此，我们报告了一种新策略，可对石墨烯进行化学功能化，用于 FET，而不影响电气性能。关键思想是通过连续处理金纳米颗粒 (AuNP) 和硫醇-SAM（自组装单层）分子来控制石墨烯的费米能级，通过翻转 AuNP 之间的电偶极子分别诱导正和负掺杂效应和地对空导弹。基于这种方法，我们在功能化石墨烯上使用重金属离子演示了石墨烯 FET 上的狄拉克电压切换器，其中介导 SAM 的羧基官能团有效地与金属离子形成络合物，因此，狄拉克电压可以是通过石墨烯上不同电荷的掺杂而发生正向移动。我们相信，纳米颗粒介导的石墨烯 SAM 功能化可以为开发充分利用石墨烯原始特性的高性能化学、环境和生物传感器铺平道路。

更新日期：2021-01-25

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