Terahertz Time Domain Spectroscopy to Detect Low-Frequency Vibrations of Double-Walled Carbon Nanotubes - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue European Journal of Inorganic Chemistry Année : 2010

Terahertz Time Domain Spectroscopy to Detect Low-Frequency Vibrations of Double-Walled Carbon Nanotubes

Résumé

We have measured the frequency-dependent real index of refraction and extinction coefficient (and hence the complex dielectric function) of a free-standing double-walled carbon nanotube film of thickness 200 nm by using terahertz time domain spectroscopy in the frequency range 0.1 to 2.5 THz. The real index of refraction and extinction coefficient have very high values of approximately 52 and 35, respectively, at 0.1 THz, which decrease at higher frequencies. Two low-frequency phonon modes of the carbon nanotubes at 0.45 and 0.75 THz were clearly observed for the first time in the real and imaginary parts of the complex dielectric function along with a broad resonance centred at around 1.45 THz, the latter being similar to that in single-walled carbon nanotubes assigned to electronic excitations. Our experiments bring out a possible application of double-walled carbon nanotube films as a neutral density filter in the THz range.

Dates et versions

hal-00671160 , version 1 (16-02-2012)

Identifiants

Citer

Sunil Kumar, Natrajan Kamaraju, Alexander Moravsky, Raouf O Loutfy, Marc Tondusson, et al.. Terahertz Time Domain Spectroscopy to Detect Low-Frequency Vibrations of Double-Walled Carbon Nanotubes. European Journal of Inorganic Chemistry, 2010, 2010 (27), pp.4363-4366. ⟨10.1002/ejic.201000524⟩. ⟨hal-00671160⟩

Collections

CNRS LOMA
229 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More