Smallest Carbon Nanotube Is 3 Å in Diameter
2004; American Physical Society; Volume: 92; Issue: 12 Linguagem: Inglês
10.1103/physrevlett.92.125502
ISSN1092-0145
AutoresXinluo Zhao, Y. Liu, Sakae Inoue, Tomoko Suzuki, R. Jones, Yukio Ando,
Tópico(s)Boron and Carbon Nanomaterials Research
ResumoPrevious energetic considerations have led to the belief that carbon nanotubes (CNTs) of $4\text{ }\text{ }\AA{}$ in diameter are the smallest stable CNTs. Using high-resolution transmission electron microscopy, we find that a stable $3\text{ }\text{ }\AA{}$ CNT can be grown inside a multiwalled carbon nanotube. Density functional calculations indicate that the $3\text{ }\text{ }\AA{}$ CNT is the armchair $\mathrm{CNT}(2,2)$ with a radial breathing mode at $787\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}1}$. Each end can be capped by half of a ${\mathrm{C}}_{12}$ cage (hexagonal prism) containing tetragons.
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