Selective Tuning of the Electronic Properties of Coaxial Nanocables through Exohedral Doping

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• 作者：Antonio G. Souza Filho ; Vincent Meunier ; Mauricio Terrones ; Bobby G. Sumpter ; Eduardo B. Barros ; Federico Villalpando-Pá ; ez ; Josue Mendes Filho ; Yoong Ahm Kim ; Hiroyuki Muramatsu ; Takuya Hayashi
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：August 2007
• 年：2007
• 卷：7
• 期：8
• 页码：2383 - 2388
• 全文大小：227K
• 年卷期：v.7,no.8(August 2007)
• ISSN：1530-6992

文摘

The electronic properties of exohedrally doped double-walled carbon nanotubes (DWNTs) have been investigated using density functionaltheory and resonance Raman spectroscopy (RRS) measurements. First-principles calculations elucidate the effects of exohedral doping onthe M@S and S@M systems, where a metallic (M) tube is either inside or outside a semiconducting (S) one. The results demonstrate thatmetallic nanotubes are extremely sensitive to doping even when they are inner tubes, in sharp contrast to semiconducting nanotubes, whichare not affected by doping when the outer shell is a metallic nanotube (screening effects). The theoretical predictions are in agreement withRRS data on Br₂- and H₂SO₄-doped DWNTs. These results pave the way to novel nanoscale electronics via exohedral doping.