title: Selective optical property modification of double-walled carbon nanotubes by fluorination.
abstract: We found that by fluorination of double-walled carbon nanotubes (DWNTs), it is possible to suppress only the Raman radial breathing mode and absorption peaks from the outer (large diameter) tubes of DWNTs. In contrast, Raman signals from the inner shells showed no difference from the pristine DWNTs. The stability of the inner shells of fluorinated DWNTs was also confirmed from the photoluminescence (PL) map and the optical absorption spectra, which only showed the signals from the inner shells of DWNTs, with no distinct change in the optical properties of the inner tubes after fluorination. Our results indicate that once fluorinated, there exists only a weak, if not none, interaction between the inner tube and the outer fluorinated tube, proving that fluorination can be used to suppress the optical properties of carbon nanotubes without interfering the properties of inner tubes. The present finding can be important in electronic and sensor applications, keeping the inner tube from having unwanted contact with other substances that may distract from the inner tube's own characteristics.
authors.affiliation: Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano-shi 380-8553, Japan. hayashi@endomoribu.shinshu-u.ac.jp
authors.forename: Takuya
authors.initials: T
authors.lastname: Hayashi
authors.forename: Daisuke
authors.initials: D
authors.lastname: Shimamoto
authors.forename: Yoong Ahm
authors.initials: YA
authors.lastname: Kim
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Muramatsu
authors.forename: Fujio
authors.initials: F
authors.lastname: Okino
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Touhara
authors.forename: Takashi
authors.initials: T
authors.lastname: Shimada
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Miyauchi
authors.forename: Shigeo
authors.initials: S
authors.lastname: Maruyama
authors.forename: Mauricio
authors.initials: M
authors.lastname: Terrones
authors.forename: Mildred S
authors.initials: MS
authors.lastname: Dresselhaus
authors.forename: Morinobu
authors.initials: M
authors.lastname: Endo
mesh_terms: D003460:Crystallization / Q000379:methods*; D005461:Fluorine / Q000737:chemistry*; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012031:Refractometry; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D037742:Nanotubes, Carbon; D005461:Fluorine