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X-ray tubes with an electron source of carbon nanotubes (CNTs) have often been fabricated by vacuum brazing at high temperature, during which CNT emitters have been frequently damaged probably by reacting with other ingredients incorporated into the CNT paste. In particular, some metal or oxide fillers seemed to accelerate the catalytic decomposition of CNTs during high-temperature treatment. In this...
This study investigated the effect of boron and phosphorus compounds on the thermal stability and oxidation resistance of carbon nanotubes (CNTs). Addition of these compounds evidently increased oxidation temperatures of CNTs probably by poisoning chemically their active sites. We applied the CNTs treated with boron and phosphorus compounds to the CNT paste emitters for electron sources of x-ray tubes...
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