Hidden Caves in an Aggregate of Single-Wall Carbon Nanohorns Found by Using Gd2O3 Probes

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• 作者：Ryota Yuge*^† ; ; Toshinari Ichihashi^† ; ; Jin Miyawaki^‡ ; ^§ ; ; Tsutomu Yoshitake^† ; ; Sumio Iijima^† ; ^# ; M
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：February 19, 2009
• 年：2009
• 卷：113
• 期：7
• 页码：2741-2744
• 全文大小：334K
• 年卷期：v.113,no.7(February 19, 2009)
• ISSN：1932-7455

文摘

We investigated the inner structure of an aggregate made of single-wall carbon nanohorns (SWNHs). This structure has not been clarified because the thousands of SWNHs are densely packed and difficult to observe directly by electron microscopy. We used Gd₂O₃ as a probe for the electron microscope observation: Gd₂O₃ was confined inside SWNH via the incorporation of Gd acetate inside SWNHs with holes opened (NHox), followed by heat treatment at 1200 °C in Ar gas. From microscopic study, we found that Gd₂O₃ formed clumped crystals with sizes of 7−21 nm around the center of the SWNH aggregates, suggesting that there were 10−20-nm caves near the aggregate’s center.