From ACS Nano: Synthesis and Transformation of Linear Adamantane Assemblies inside Carbon Nanotubes

| October 1, 2012 | 0 Comments

Jinying Zhang,† Yanquan Feng,‡,# Hitoshi Ishiwata,§ Yasumitsu Miyata,† Ryo Kitaura,† Jeremy E. P. Dahl,§ Robert M. K. Carlson,§ Hisanori Shinohara,†,* and David Tomanek‡,*

† Department of Chemistry and Institute for Advanced Research, Nagoya University, Nagoya, 464-8602, Japan

‡ Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, United States

§ Stanford Institute for Materials and Energy Science, Stanford University, Stanford, California 94305, United States

# School of Physics, Beijing Institute of Technology, Beijing 100081, People’s Republic of China

We report the assembly and thermal transformation of linear diamondoid assemblies inside carbon nanotubes. Our calculations and observations indicate that these molecules undergo selective reactions within the narrow confining space of a carbon nanotube. Upon vacuum annealing of adamantane molecules encapsulated in a carbon nanotube, we observe a sharp Raman feature at 1857 cm^-1, which we interpret as a stretching mode of carbon chains formed by thermal conversion of adamantane inside a carbon nanotube. Introduction of pure hydrogen during thermal annealing, however, suppresses the formation of carbon chains and seems to keep adamantane intact.

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