Low-energy electron transmission imaging of clusters on free-standing graphene

Abstract

We investigated the utility of free-standing graphene as a transparent sample carrier for imaging nanometer-sized objects by means of low-energy electron holography. The sample preparation for obtaining contamination-free graphene as well as the experimental setup and findings are discussed. For incoming electrons with 66 eV kinetic energy graphene exhibits 27% opacity per layer. Hence, electron holograms of nanometer-sized objects adsorbed on free-standing graphene can be recorded and numerically reconstructed to reveal the object's shapes and distribution. Furthermore, a Moire effect has been observed with free-standing graphene multi-layers.

References in corpus (3)

• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Imaging and Dynamics of Light Atoms and Molecules on Graphene
• Graphene as a transparent conductive support for studying biological molecules by transmission electron microscopy

Cited by in corpus (5)

• Sub-GeV Dark Matter Detection with Electron Recoils in Carbon Nanotubes
• Spatial coherence of electron beams from field emitters and its effect on the resolution of imaged objects
• Mapping Unoccupied Electronic States of Freestanding Graphene by Angle-Resolved Low-Energy Electron Transmission
• Metal adsorption and nucleation on free-standing graphene by low-energy electron point source microscopy (graphene intercalation)
• How to image single isolated atoms by using coherent low-energy electrons