Zinc Selenide Nanoribbons and Nanowires

Abstract

Zinc selenide nanoribbons and nanowires were obtained using laser ablation of ZnSe pressed powders. Their formation appeared to follow the vapor−solid and vapor−liquid−solid growth mechanisms, respectively. The product was characterized by means of scanning electron microscopy, transmission electron microscopy, micro-Raman scattering, and energy-dispersive X-ray spectroscopy. The ZnSe nanoribbons had a perfect wurtzite-2H single-crystal structure with a [120] growth direction and the {001} close-packed lattice planes of hexagonal ZnSe stacking along the nanoribbon width axis. The ZnSe nanowires grew with the {001} close-packed lattice planes of the wurtzite-2H structure stacking along the nanowire length axis. Both the longitudinal optic (LO) and transverse optic (TO) phonon peaks of the ZnSe nanowires and nanoribbons showed a clear shift toward low frequency relative to bulk values, probably because of small size and large surface effects. The ZnSe nanostructures exhibited strong self-activated luminescence centered at 596 nm.

Femtosecond Laser Induced Nanowire Technique and Its Applications

“…Raman spectral peaks at 251 and 205 cm −1 are attributed to the longitudinal and the transverse optical modes. Compared with those of ZnSe crystals, both of the two peaks are wider because the surface-volume ratio of nanowires is much higher [18]. No vibration mode of ZnO is observed; hence, we confirmed that evaporated zinc atoms are not oxidized and no ZnO molecules are formed during femtosecond laser ablation, though it is conducted in air.…”

“…The ZnSe nanowires reported to date usually have a zinc blende structure growing along the (111) direction [17]. Wurtzite ZnSe nanowires growing along the c-axis were recently fabricated with PLD and thermochemical methods [18,19]. Nanowires with a wurtzite structure can also grow rapidly along the a-axis.…”

Quantum phenomena of ZnSe nanocrystals prepared by electron beam evaporation technique

“…Previous reports [18,19] based on chemically deposited ZnSe thin films showed that the films can form either cubic zinc blende or hexagonal wurtzite type structure. Hence, in order to determine the crystal structure of as-deposited and annealed ZnSe films, the XRD pattern of films were analyzed.…”

Nanoparticles and Nanostructures Fabricated Using Femtosecond Laser Pulses

“…It can be clearly seen that the cubic phase of the ZnSe single-crystal wafers has been transferred to the hexagonal phase in the ZnSe nanoparticles. Because hexagonal ZnSe is a metastable phase under ambient conditions, it can only be fabricated under the very strict growth conditions (Jiang et al, 2004;Liu et al, 2007b). However, hexagonal ZnSe nanoparticles can be easily and reliably achieved using femtosecond laser ablation as demonstrated in this study.…”