Premium
WE‐E‐204B‐04: TiO2 Nanotube Field Emitter as a New Cold Cathode for X‐Ray Generation
Author(s) -
Alivov Y,
Molloi S
Publication year - 2010
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.3469434
Subject(s) - field electron emission , materials science , nanotube , anodizing , cathode , substrate (aquarium) , carbon nanotube , titanium dioxide , nanotechnology , layer (electronics) , oxide , titanium oxide , cold cathode , titanium , common emitter , optoelectronics , chemical engineering , composite material , electron , metallurgy , chemistry , aluminium , physics , oceanography , quantum mechanics , geology , engineering
/Purpose : Titanium dioxide (TiO 2 ) nanotubes (NTs) grown by anodization are proposed as a new candidate for a cold cathode X‐ray source. This kind of oxide nanotube can potentially be an excellent choice to overcome the major limitations that exist in relation to carbon nanotubes (CNT). Being an oxide, TiO 2 is not affected by residual oxygen present in the tube in contrast to CNTs, which can severely degrade from exposure to oxygen. Second, since TiO 2 nanotubes are grown on a titanium (Ti) sheet as the latter oxidizes, a good electrical contact between TiO 2 nanotube film and conductive Ti substrate is guaranteed. On the other hand, poor electrical contact between CNT and deposited substrate causes heating effects. The goal of this work was to simulate the effect of the NT parameters on field TiO 2 NT emission properties. Methods : The field emission from two sources was considered: 1) from the top of NTs, and 2) the bottom of the NTs which serve as a thin semiconductor layer. Numerical calculations were performed to study the dependence of field emission on NT parameters for each emission mechanism. The calculations were performed in Matlab. Results : It is shown that the current decreased significantly with an increase of NT diameter, while it increased with the height of NTs. The rate of current increase with diameter is stronger for smaller diameter NTs. Regarding field emission from the bottom of the TiO 2 layer, this current is strongly dependent on the TiO 2 layer thickness and decreases as the latter increases. This current linearly increases with an increase of TiO 2 electron charge carrier concentration. Conclusions : Effect of TiO 2 NT geometrical and physical parameters on field emission can be simulated and the results can be used as a guide for design purposes.