Hidden Caves In An Aggregate Of Single-Wall Carbon Nanohorns Found By Using Gd2o3 Probes
JOURNAL OF PHYSICAL CHEMISTRY C(2009)
Abstract
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 degrees 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.
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Key words
hidden caves,carbon,probes,single-wall
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