title: Charge manipulation in molecules encapsulated inside single-wall carbon nanotubes.
abstract: We report clear experimental evidence for the charge manipulation of molecules encapsulated inside single-wall carbon nanotubes (SWCNTs) using electrochemical doping techniques. We encapsulated β-carotene (Car) inside SWCNTs and clarified electrochemical doping characteristics of their Raman spectra. C=C streching modes of encapsulated Car and a G band of SWCNTs showed clearly different doping behaviors as the electrochemical potentials were shifted. Electron extraction from encapsulated Car was clearly achieved. However, electrochemical characteristics of Car inside SWCNTs and doping mechanisms elucidated by calculations based on density-functional theory indicate the difficulty of charge manipulation of molecules inside SWCNTs due to the presence of strong on-site Coulomb repulsion energy at the molecules.
authors.affiliation: Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan. yanagi-kazuhiro@tmu.ac.jp
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Yanagi
authors.forename: Rieko
authors.initials: R
authors.lastname: Moriya
authors.forename: Nguyen Thanh
authors.initials: NT
authors.lastname: Cuong
authors.forename: Minoru
authors.initials: M
authors.lastname: Otani
authors.forename: Susumu
authors.initials: S
authors.lastname: Okada