Abstract
The structures and field emission properties of multi-walled carbon nanotube arrays implanted with Zn+ by MEVVA ion implanter have been investigated. The results revealed that Zn+ implantation induced structural damage and that the top of carbon nanotubes with multi-layered graphite structure were transformed into carbon nanowires with amorphous structure. Meanwhile, C: Zn solid solution was synthesized after Zn+ implantation. The turn-on field and threshold field were 0.80 and 1.31 V/μm, respectively for original multi-walled carbon nanotube arrays and were reduced to 0.66 and 1.04 V/μm due to the synthesis of C and Zn composite, in which the work function was reduced after low doses of Zn+ implantation. It is indicated that low doses of Zn+ implantation can improve field emission performance of multi-walled carbon nanotube arrays. Otherwise, high doses of Zn+ implantation can reduce field emission properties of multi-walled carbon nanotube arrays, because radiation damage reduces the electric field enhancement factor.
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