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Fabrication, optical, and field emission properties of ZnO nanorod, nanopagoda, and nanotip emitters were studied. The ZnO nanotip emitters are prepared by using combination of solution method and oxygen plasma treatment. All the emitters exhibit a highly c-axis preferred orientation crystalline structure. The nanopagoda and nanotip emitters have turn-on fields of 1.43 and 1.07 V/μm, respectively,...
The optical response at room temperature of ZnO nanostructures, grown by controlled vapour phase deposition, to low concentrations of NO2 gas mixed in dry-air has been investigated. In particular the quenching in the emission signal, due to the interactions between oxidizing gas molecules and sample surface, has been monitored in excitonic and defect band, as a function of NO2 gas concentration. The...
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