Raman frequency shift in oxygen-functionalized carbon nanotubes

Polyurea-functionalized multiwalled carbon nanotubes: synthesis, morphology, and Raman spectroscopy.

An in situ polycondensation approach was applied to functionalize multiwalled carbon nanotubes (MWNTs), resulting in various linear or hyperbranched polycondensed polymers [e.g., polyureas, polyurethanes, and poly(urea-urethane)-bonded carbon nanotubes]. The quantity of the grafted polymer can be easily controlled by the feed ratio of monomers. As a typical example, the polyurea-functionalized ...

Functionalized Carbon Nanotubes for Catalysis of Oxygen Reduction

Chemically functionalized carbon nanotubes.

Since their discovery, carbon nanotubes have attracted the attention of many a scientist around the world. This extraordinary interest stems from their outstanding structural, mechanical, and electronic properties. In fact, apart from being the best and most easily available one-dimensional (1D) model system, carbon nanotubes show strong application potential in electronics, scanning probe micr...

Curvature-induced optical phonon frequency shift in metallic carbon nanotubes

Ken-ichi Sasaki,1 Riichiro Saito,1 Gene Dresselhaus,2 Mildred S. Dresselhaus,3,4 Hootan Farhat,5 and Jing Kong4 1Department of Physics, Tohoku University and CREST-JST, Sendai 980-8578, Japan 2Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA 3Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02...

Raman Scattering in Carbon Nanotubes

The vibrational properties of single-walled carbon nanotubes reflect the electron and phonon confinement as well as the cylindrical geometry of the tubes. Raman scattering is one of the prime techniques for studying the fundamental properties of carbon tubes and nanotube characterization. The most important phonon for sample characterization is the radial-breathing mode, an in-phase radial move...