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Growth and properties of ultra-violet emitting aligned zinc oxide nanocones with hexagonal caps
Ahmad Umar1, A Al Hajry, A A Al-Ghamdi
1Department of Chemistry, Faculty of Science, Advanced Materials and Nano-Engineering Laboratory (AMNEL), Najran University, P.O. Box 1988, Najran 11001, Kingdom of Saudi Arabia.
Abstract:
Ultraviolet-emitting, single-crystalline aligned zinc oxide (ZnO) nanocones with hexagonal caps were grown on silicon substrate via simple non-catalytic thermal evaporation process. High-purity metallic zinc powder and oxygen were used as source materials for zinc and oxygen, respectively. The detailed structural characterizations confirmed that the formed products are single-crystalline, possess a wurtzite hexagonal phase and grown along the c-axis direction. Raman-active optical-phonon E2(high) mode at 437 cm(-1) with sharp and strong UV emission at 385 nm in room-temperature photoluminescence (PL) spectrum demonstrated that the as-grown ZnO nanocones with hexagonal caps possess good-crystal quality with the excellent optical properties. Finally, a plausible growth mechanism for the formation of as-grown ZnO nanocones with hexagonal caps was also proposed.
