■Electronic Materials Physics Laboratory
03/1999, D.Sc., Himeji Institute of Technology
1. Electronic and structural properties of network solids.
2. Dynamics of molecules confined to nanoscale spaces.
(1) Carbon nanomaterials are promising for the development of new technologies owing to their unique electronic, thermal, and elastic properties. SWCNTs can behave as metals or semiconductors depending on their helicity and diameter. By using a nuclear magnetic resonance (NMR) technique, we study the electronic states of SWCNTs and other carbon nanomaterials. (Fig. 1. 13C-NMR spectra obtained for metallic and semiconducting SWCNTs. The inset shows a highly purified SWCNT paper.)
(2) SWCNTs serve as model systems for confined molecules in cylindrical cages a few molecules wide. We are exploring the properties of molecular materials confined to the nanoscale cages of network solids. (Fig. 2. Magnetization curves for oxygen adsorbed inside SWCNTs. The inset shows a schematic of the alignment of oxygen molecules encapsulated in the SWCNTs.)
(3) One of the constituent materials of cement, insulating 12CaO・7Al2O3, with a subnanoscale structure becomes metallic by the heat treatment. We study the metallization mechanism of 12CaO・7Al2O3. (Fig. 3. Structure of an empty cage of 12CaO・7Al2O3 and the temperature dependence of the 27Al nuclear spin-lattice relaxation rate, T1−1.)
- 1) N. Serita, Y. Nakai, K. Matsuda, K. Yanagi, Y. Miyata, T. Saito, and Y. Maniwa, “Intertube effects on one-dimensional correlated state of metallic single-wall carbon nanotubes probed by 13C NMR”, Physical Review B 95, pp. 035128 (2017).
- 2) H. Kyakuno, M. Fukasawa, R. Ichimura, K. Matsuda, Y. Nakai, Y. Miyata, T. Saito, and Y. Maniwa, “Diameter-dependent hydrophobicity in carbon nanotubes”, The Journal of Chemical Physics, vol. 145, pp. 064514 (2016).
- 3) M. Hagiwara, M. Ikeda, T. Kida, K. Matsuda, S. Terada, H. Kyakuno, K. Yanagi, Y. Maniwa, and K. Okunishi, “Haldane state formed by oxygen molecules encapsulated in single-walled carbon nanotubes”, Journal of the Physical Society of Japan, vol. 83, pp. 113706 (2014).
- 4) K. Matsuda, K. Yanagi, S. Sagitani, H. Kataura, and Y. Maniwa, “13C-NMR shift of highly concentrated metallic and semiconducting single-walled carbon nanotubes”, Journal of the Physical Society of Japan, vol. 82, pp. 015001 (2013).
- 5) H. Kyakuno, K. Matsuda, Y. Nakai, T. Fukuoka, Y. Maniwa, H. Nishihara, and T. Kyotani, “Amorphous water in three-dimensional confinement of zeolite-templated carbon,” Chemical Physics Letters, vol. 571, pp. 54 (2013).
Affiliated Academic Organizations
K. Matsuda: The Physical Society of Japan, The Fullerenes, Nanotubes and Graphene Research Society.
|◯ Professors: 1||◯ Undergraduates: 6|