Abstract:Carbon nanotubes (CNTs) can be used as field emission electron sources in X‐ray tubes for medical applications [1, 2]. In a laboratory setting, field emission measurements of CNTs are usually carried out in an ultra‐high vacuum system with base pressure of about 1E‐7 mbar or better. Under less stringent vacuum conditions, CNTs are found to exhibit lower emission currents and reduced lifetimes [3, 4].
Here, we report the direct study on the structural changes in CNTs as we heated and oxid… Show more
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