Abstract
Resonance Raman spectra of boron carbonitride (BCN) nanotubes synthesized by hot-filament chemical vapor deposition were investigated. The intensity of the D band is insensitive to laser excitation energy (Elaser), while the intensity of the G and G′ bands increases as Elaser increases, and saturates at Elaser=2.67 eV. This particular resonance behavior is ascribed to an electronic transition process different from the π–π* transition that occurs in carbon materials. The dispersive behavior of the D-related bands also shows an inflection at Elaser=2.67 eV and different ∂ω/∂Elaser compared to carbon materials. These results indicate there are special electronic and phonon structures in BCN nanotubes.
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