Abstract

The optical response by NO2 gas adsorption at different concentrations has been investigated, at room temperature, in ZnO nanostructured films grown by controlled vapor phase deposition. The variation (quenching) in the photoluminescence signal from excitonic and defects bands, due to the interactions between the oxidizing gas molecules and the sample surface, has been detected and dynamic responses and calibration curves as a function of gas concentration have been obtained and analyzed for each band. We showed that the sensing response results larger in excitonic band than in defect one and that the emission signal rises from two different quenchable and unquenchable states. A simple model was proposed in order to explain the quenching processes on the emission intensity and to correlate them to the morphological features of the samples. Finally, the reversibility of the quenching effects has also been tested at high gas concentration. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3700251]

Autore Pugliese

• Taurino Antonietta , Creti' Arianna , Quaranta Fabio , Lomascolo Mauro , Rella Roberto

Tutti gli autori

• A. Creti; D. Valerini; A. Taurino; F. Quaranta; M. Lomascolo; R.Rella

Titolo volume/Rivista

Journal of applied physics

Anno di pubblicazione

2012

ISSN

0021-8979

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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