Luminescence response of ZnO nanowires to gas adsorption

Year: 2009

Authors: Baratto C., Todros S., Faglia G., Comini E., Sberveglieri G., Lettieri S., Santamaria L., Maddalena P.

Autors Affiliation: Univ Brescia, CNR INFM, SENSOR Lab, I-25133 Brescia, Italy;
CNR-INFM COHERENTIA and Univ Naples Federico 2, Dipartimento Sci Fisiche, I-80126 Naples, Italy

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 NO2 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 NO2 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. (C) 2009 Elsevier B.V. All rights reserved.


Volume: 140 (2)      Pages from: 461  to: 466

More Information: This work was supported, within the EU FP6, by the ERANET project \”NanoSci-ERA: NanoScience in the European Research Area\”.
KeyWords: Nitrogen dioxide; Optochemical sensors; Photoluminescence; Zinc oxide nanowires
DOI: 10.1016/j.snb.2009.05.018

Citations: 63
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