A study on the modulation of the electrical transport by mechanical straining of individual titanium dioxide nanotube

Asthana, A.; Shokuhfar, T.; Gao, Q.; Heiden, P.; Friedrich, C.; Yassar, R. S.
August 2010
Applied Physics Letters;8/16/2010, Vol. 97 Issue 7, p072107
Academic Journal
We report here, the deformation driven modulation of the electrical transport properties of an individual TiO2 nanotube via in situ transmission electron microscopy (TEM) using a scanning tunneling microscopy system. The current-voltage characteristics of each individual TiO2 nanotube revealed that under bending deformation within the elastic limit, the electrical conductivity of a TiO2 nanotube can be enhanced. High resolution TEM and electron diffraction pattern reveal that TiO2 nanotubes have tetragonal structure (a=0.378 nm, c=0.9513 nm, I41/amd). Analysis based on a metal-semiconductor-metal model suggests that in-shell, surface defect-driven conduction modes and electron–phonon coupling effect are responsible for the modulated semiconducting behaviors.


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