Type

Journal Article

Authors

Hongzhou Zhang
Pierce Maguire
Yangbo Zhou
Robert O'Connell

Subjects

Physics

Topics
imaging helium ion secondary high throughput high resolution graphene polymethyl methacrylate surface electronic properties

High throughput secondary electron imaging of organic residues on a graphene surface. (2014)

Abstract Surface organic residues inhibit the extraordinary electronic properties of graphene, hindering the development of graphene electronics. However, fundamental understanding of the residue morphology is still absent due to a lack of high-throughput and high-resolution surface characterization methods. Here, we demonstrate that secondary electron (SE) imaging in the scanning electron microscope (SEM) and helium ion microscope (HIM) can provide sub-nanometer information of a graphene surface and reveal the morphology of surface contaminants. Nanoscale polymethyl methacrylate (PMMA) residues are visible in the SE imaging, but their contrast, i.e. the apparent lateral dimension, varies with the imaging conditions. We have demonstrated a quantitative approach to readily obtain the physical size of the surface features regardless of the contrast variation. The fidelity of SE imaging is ultimately determined by the probe size of the primary beam. HIM is thus evaluated to be a superior SE imaging technique in terms of surface sensitivity and image fidelity. A highly efficient method to reveal the residues on a graphene surface has therefore been established.
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Full list of authors on original publication

Hongzhou Zhang, Pierce Maguire, Yangbo Zhou, Robert O'Connell

Experts in our system

1
Hongzhou Zhang
Trinity College Dublin
Total Publications: 50
 
2
Pierce Maguire
Trinity College Dublin
Total Publications: 11
 
3
Yangbo Zhou
Trinity College Dublin
Total Publications: 10
 
4
Robert O'Connell
Trinity College Dublin
Total Publications: 3