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Atomically resolved field emission patterns of single-walled carbon nanotubes
Weimin Liu1, Shimin Hou, Zhaoxiang Zhang
1Department of Electronics, Peking University, Beijing 100871, People's Republic of China.
Ultramicroscopy
|January 14, 2003
Summary
Field emission microscopy revealed atomic resolution from single-walled carbon nanotubes (SWCNTs). This technique visualized individual atoms at the SWCNT open end, demonstrating its high resolution capabilities.
Area of Science:
- Materials Science
- Nanotechnology
- Physics
Background:
- Single-walled carbon nanotubes (SWCNTs) possess unique electronic and structural properties.
- Field Emission Microscopy (FEM) is a powerful tool for investigating electron emission.
Purpose of the Study:
- To investigate the electron emission and structural properties of SWCNTs using FEM.
- To determine the resolution capabilities of FEM for SWCNT analysis.
Main Methods:
- Field Emission Microscopy (FEM) was employed to study SWCNTs.
- Transmission Electron Microscopy (TEM) was used to confirm SWCNT bundle presence.
Main Results:
- An FEM image showed an elliptic ring-like structure from a zigzag (16,0) SWCNT open end.
- Each bright dot in the image likely represents a single atom.
- FEM demonstrated a resolution of 0.2nm, consistent with theoretical predictions.
Conclusions:
- FEM can achieve atomic resolution when imaging SWCNTs.
- The observed FEM pattern provides insights into the atomic structure at SWCNT open ends.