Abstract
Zinc oxide nanowires were synthesized by means of evaporation–condensation technique and their green photoluminescence emission at room temperature was studied during exposure to nitrogen dioxide, ethanol and humidity. A reversible modification of static photoluminescence efficiency was obtained upon exposure to low concentrations of nitrogen dioxide. The optical sensor was able to detect NO 2 values as low as 0.1 ppm in dry air, that is the attention level for outdoor detection. Time-resolved photoluminescence measurements in presence of NO 2 showed small modification of recombination rates and lifetimes due to introduction of quencher gas. The results support a surface static quenching model, according to which the gas molecules suppress a fraction of radiative transitions instead of merely reducing their probabilities.
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