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Abstract
The effects of the electric field on the radial deformation and electronic properties of armchair and zigzag single-walled ZnO nanotubes are investigated by the density functional theory. Under the transverse electric field, the circular cross-sections of ZnO nanotubes are deformed to elliptic. In addition, the bandgap of ZnO nanotube gradually reduced with the increasing electric field strength. Such field-induced modulation effect is enhanced in ZnO nanotubes with larger tube diameter, but is not sensitive to the chirality. The mechanisms of the radial deformation and the variations of bandgaps of the ZnO nanotubes are analyzed.
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