Difference in extent of the Fermi energy and decrease of band-gap energy for three kinds of CNTs show that CNT with one end open is favorable for the preparation of field emission electrode.
三种不同结构的碳纳米管在费米能的增幅上有些差异，带宽减小的程度也是不同的，一端封闭的碳纳米管在F掺杂后费米能的增幅最大，说明在制备场发射电极时选择一端封闭的碳纳米管更加有利。
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