自组装十八硫醇单层膜在石墨烯上用于汞检测。

Self-assembled 1-octadecanethiol monolayers on graphene for mercury detection.

机构信息

National Center for Nanoscience and Technology, China, 11 Beiyitiao Street, Zhongguancun, Beijing 100190, People's Republic of China.

出版信息

Nano Lett. 2010 Nov 10;10(11):4738-41. doi: 10.1021/nl1032556.

DOI:10.1021/nl1032556

PMID:20931998

Abstract

We report studies on surface modification of graphene with 1-octadecanethiol and its application as heavy metal sensors. The alkanethiol molecules can self-assemble into large-scale highly ordered monolayers on single-layer graphene regardless of the roughness of graphene surfaces inherited from the underlying amorphorous silicon oxide (SiO2) dielectric substrates. Atomically resolved scanning tunneling microscopy imaging of modified graphene sheets on SiO2 was conducted to reveal configuration details of the self-assembled structure. Functionalization of graphene field effect transistors (Gra-FETs) with 1-octadecanethiol was realized and successfully explored for mercury(II) (Hg2+) detection at 10 ppm.

摘要

我们报告了对 1-十八硫醇进行的石墨烯表面修饰及其在重金属传感器方面的应用研究。这些烷硫醇分子可以在单层石墨烯上自组装成大规模的高度有序单层，而不管石墨烯表面从其下面的非晶态氧化硅（SiO2）介电基底继承的粗糙度如何。我们对 SiO2 上修饰后的石墨烯片进行了原子分辨扫描隧道显微镜成像，以揭示自组装结构的细节。我们实现了 1-十八硫醇对石墨烯场效应晶体管（Gra-FET）的功能化，并成功地探索了其对 10ppm 汞(II)（Hg2+）的检测。