Water Encapsulation Control in Individual Single-Walled Carbon Nanotubes by Laser Irradiation.
Owing to one-dimensionality, nanoscale curvature, and high chemical stability, single-walled carbon nanotubes (SWNTs) have unique surfaces for gas molecules: outer surface as adsorption (exohedral) site and inner surface that provides encapsulation (endohedral) space. Because as-grown SWNTs have different structure (chirality and diameter) and they are normally bundled, it is extremely difficult to investigate the intrinsic properties of SWNTs as adsorbent. Here we demonstrate controlling adsorption and encapsulation states of water in individual suspended SWNTs using laser irradiation with monitoring of their behavior by photoluminescence measurement and perform molecular dynamics simulation. The laser heating and the pressure control make water molecules encapsulated or ejected for SWNTs, which are individually oxidized and opened with laser heating. The precise control of oxidization makes it possible to observe the cluster formation of water molecules during the encapsulation process and to confine water molecules inside SWNTs even in vacuum.
†Nanocarbon Research Division, Research Institute for Science and Technology, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan.|‡Department of Mechanical Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan.
Shohei
S
Chiashi
§Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan.
Tateki
T
Hanashima
§Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan.
Ryota
R
Mitobe
§Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan.
Kotaro
K
Nagatsu
†Nanocarbon Research Division, Research Institute for Science and Technology, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan.|∥Department of Liberal Arts, Faculty of Engineering, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan.|⊥Department of Electrical Engineering, Graduate School of Engineering, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan.
Takahiro
T
Yamamoto
†Nanocarbon Research Division, Research Institute for Science and Technology, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan.|§Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan.
Yoshikazu
Y
Homma
carbon nanotubes; molecular dynamics simulation; photoluminescence; water adsorption; water encapsulation