Ultraclean suspended graphene by radiolysis of adsorbed water
arXiv:2405.12395 · doi:10.1021/acs.nanolett.4c01440
Abstract
Access to intrinsic properties of a 2D material is challenging due to the absence of a bulk that would dominate over surface contamination, and this lack of bulk also precludes effective conventional cleaning methods that are almost always sacrificial. Suspended graphene and carbon contaminants represent the most salient challenge. This work has achieved ultraclean graphene, attested by electron energy loss (EEL) spectra unprecedentedly exhibiting fine-structure features expected from bonding and band structure. In the cleaning process in a transmission electron microscope, radicals generated by radiolysis of intentionally adsorbed water remove organic contaminants, which would otherwise be feedstock of the notorious electron irradiation induced carbon deposition. This method can be readily adapted to other experimental settings and other materials, to enable previously inhibited undertakings that rely on the intrinsic properties or ultimate thinness of 2D materials. Importantly, the method is surprisingly simple and robust, easily implementable with common lab equipment.
arXiv comment39 pages, 13 figures
References in corpus (16)
- Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
- The structure of suspended graphene sheets
- Electronic transport in two dimensional graphene
- Imaging Grains and Grain Boundaries in Single-Layer Graphene: An Atomic Patchwork Quilt
- A self-consistent theory for graphene transport
- Temperature dependent transport in suspended graphene
- Fractional quantum Hall effect and insulating phase of Dirac electrons in graphene
- How close can one approach the Dirac point in graphene experimentally?
- On the mechanism of hydrophilicity of graphene
- Towards Chirality Control of Graphene Nanoribbons Embedded in Hexagonal Boron Nitride
- Rippling of Graphene
- Cleaning graphene: comparing heat treatments in air and in vacuum
- Density dependent electrical conductivity in suspended graphene: Approaching the Dirac point in transport
- Mitigating E-beam-induced Hydrocarbon Deposition on Graphene for Atomic-Scale Scanning Transmission Electron Microscopy Studies
- Internal degrees of freedom and transport of benzene on graphite
- Controlling hydrocarbon transport and electron beam induced deposition on single layer graphene: toward atomic scale synthesis in the scanning transmission electron microscope