|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Nanostructured Materials for Nuclear Applications
||Surface and Interface Effects on Zinc Oxide Nanowires due to Ionizing Radiation
||Daniel Mayo, Ryan Nolen, Richard Haglund
|On-Site Speaker (Planned)
Zinc oxide nanowires are potentially useful photoluminescent (PL) radiation detectors, because both the ultraviolet (near band-edge) and visible (donor-acceptor pair defect) radiation are altered by ionizing radiation. Zinc oxide nanopowders have been considered as scintillators, but their omnidirectional optical response is relatively weak for finite detector solid angle, whereas nanowires can be grown to emit in a single direction, therefore making PL detection highly efficient. We have measured the PL response of zinc oxide nanowires both to gamma rays and charged particles, and quantified the effects of nanowire surfaces and interfaces on the PL response. By studying the PL kinetics as a function of time following irradiation, we infer the relaxation rates of specific radiation-induced oxygen vacancies and to identify the differences in defect-formation channels for gamma rays and charged particles (alpha particles and protons). We also discuss radiation effects on zinc-oxide/magnesium-oxide core-shell nanowires, which have a higher optical efficiency.
||Planned: A print-only volume