Secondary electron emission from magnesium oxide on multiwalled carbon nanotubes

Won Seok Kim, Whikun Yi, Segi Yu, Jungna Heo, Taewon Jeong, Jeonghee Lee, Chang Soo Lee, J. M. Kim, Hee Jin Jeong, Young Min Shin, Young Hee Lee

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Abstract

We have investigated effects of electric fields on the yield of secondary electron emission (SEE) from the primary electron bombardment on magnesium oxide (MgO) covering vertically grown multiwalled carbon nanotubes (MWCNTs). We observe that the yield of SEE increases up to at least 22000 at a special condition. The strong local field generated by the sharp tip of vertically grown MWCNTs accelerates secondary electrons generated by primary electrons. This eventually gives rise to so called Townsend avalanche effect, generating huge number of secondary electrons in a MgO film. Emission mechanism for such a high SEE will be further discussed with energy spectrum analysis.

Original languageEnglish
Pages (from-to)1098-1100
Number of pages3
JournalApplied Physics Letters
Volume81
Issue number6
DOIs
StatePublished - 2002 Aug 5

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    Kim, W. S., Yi, W., Yu, S., Heo, J., Jeong, T., Lee, J., Lee, C. S., Kim, J. M., Jeong, H. J., Shin, Y. M., & Lee, Y. H. (2002). Secondary electron emission from magnesium oxide on multiwalled carbon nanotubes. Applied Physics Letters, 81(6), 1098-1100. https://doi.org/10.1063/1.1498492