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Schematic structure of the ionization gauge utilizing a CNT cathode.
(a) Measured normalized ion current and (b) electron current vs time when the chamber pressure gradually increased (red line) by introducing helium into it.
Normalized ion current vs chamber pressure for helium, air, nitrogen, and argon.
(a) TEM image for the CNT used in the screen-printed cathode. (b) TEM image for the CNT coated by a layer of HfC. (c) High-magnification image of the surface of the modified CNT (white parallel lines indicate the lattice planes). (d) EDX spectrum of the sample shown in (b).
Electron-current variation of the two samples: pristine screen-printed CNT cathode (black line) and a cathode coated with of HfC (red line). The chamber pressure was varied from by charging with nitrogen.
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