Naslov
Vibronic fine structure in high-resolution x-ray absorption spectra from boron nitride nanotubes

Autori
Petravić, Mladen

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
Thirteenth International Conference on the Science and Application of Nanotubes

Mjesto i datum
Brisbane, Australija, 25.06.2012. - 29.06.2012

Vrsta sudjelovanja
Plenarno

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Boron nitride nanotubes; NEXAFS; vibronic structure; defects

Sažetak
We have applied the high-resolution near-edge x-ray absorption fine structure (NEXAFS) measurements around the nitrogen K- edge to study vibrational effects in ion bombarded boron nitride nanotubes (BNNTs). Different fine structures have been observed in surface sensitive partial electron yield (PEY) and bulk sensitive total electron yield (TEY) spectra. The PEY structure is assigned to NO molecules, present close to the surface, and interpreted as vibronic coupling to electronic core excitations. Low energy ion bombardment promotes the creation of NO as broken B-N bonds are replaced by N-O bonds involving oxygen from BNNT surface. In contrast to PEY, the bulk sensitive TEY measurements on ion- bombarded samples show a clear vibronic signature of molecular nitrogen formed below the surface at the depth corresponding to the projected range of bombarding ions.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA