Joung Soon-Kil, Okazaki Toshiya, Kishi Naoki, Okada Susumu, Bandow Shunji, Iijima Sumio
Research Center for Advanced Carbon Materials, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan.
Phys Rev Lett. 2009 Jul 10;103(2):027403. doi: 10.1103/PhysRevLett.103.027403.
We investigate the effects of C60 fullerene encapsulation on the radial breathing mode (RBM) of semiconducting single-wall carbon nanotubes (SWCNTs) under tunable laser excitations. The changes in the RBM frequencies after C60 insertions show characteristic behavior; higher frequency shifts are observed in the case of smaller diameter tubes (dt<or =1.32 nm) and lower frequency shifts, in the case of larger diameter tubes (dt>or =1.32 nm). The observed frequency shifts are satisfactorily explained by the diameter-dependent interaction between the encapsulated C60 and the host SWCNTs.
