TiO2 nanotubes as a cold cathode for x-ray generation

Alivov, Yahya; Klopfer, Michael; Molloi, Sabee
June 2010
Applied Physics Letters;6/14/2010, Vol. 96 Issue 24, p243502
Academic Journal
Here we report on an x-ray source based on titanium dioxide (TiO2) nanotubes grown by electrochemical oxidation. From the analysis of current-voltage characteristics of TiO2 electron emitter field emission nature of the current was confirmed. The threshold voltage and field enhancement factors were derived to be ∼1.8 V/μm and ∼8363, respectively. The current density was ∼4.0 mA/cm2 at ∼2.4 V/μm. The stability tests showed that the current stayed stable within 6% for more than 720 h. TiO2 nanotubes were used as a cold cathode in x-ray tube and it was demonstrated that TiO2 nanotubes could be a good candidate for such applications.


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