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On mechanism of NO2 detection by ZnO excitonic luminescence (Articolo in rivista)

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On mechanism of NO2 detection by ZnO excitonic luminescence (Articolo in rivista) (literal)

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E. Orabona, D. Pallotti, A. Fioravanti, S. Gherardi, M. Sacerdoti, M.C. Carotta,P. Maddalena, S. Lettieri (2015)
On mechanism of NO2 detection by ZnO excitonic luminescence
in Sensors and actuators. B, Chemical (Print); Elsevier BV, Amsterdam (Paesi Bassi)
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E. Orabona, D. Pallotti, A. Fioravanti, S. Gherardi, M. Sacerdoti, M.C. Carotta,P. Maddalena, S. Lettieri (literal)

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Dipartimento di Fisica, Universitá degli Studi di Napoli \"Federico II\", Via Cintia, 80126 Napoli, Italy Institute for Superconductors, Oxides and Innovative Materials and Devices CNR-SPIN, U.O.S. Napoli, Via Cintia, I-80126 Napoli, Italy CNR-IMAMOTER Ferrara, Via Canal Bianco 28, I-44124 Ferrara, Italy Dipartimento di Chimica, Universitá degli Studi di Parma, Parco Area delle Scienze 17/A, I-43124 Parma, Italy Dipartimento di Fisica e Scienze della Terra, Universitá degli Studi di Ferrara, Via Saragat 1, I-44122 Ferrara, Italy CFR, Consorzio Ferrara Ricerche, Via Saragat 1, I-44122 Ferrara, Italy (literal)

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Abstract

In this work we elucidate the origin of zinc oxide (ZnO) excitonic photoluminescence modificationsinduced by adsorption of nitrogen dioxide (NO2). In particular, we investigated the effects of NO2 exposureon excitons radiative recombination efficiency and lifetime in nano-structured vs. micro-structured ZnO films synthesized by wet chemical routes. By combining electrical and optical analyses and focusing onthe role played by sample topology, we show that the presence of the oxidant species unambiguously gives rise to a decrease of photoluminescence efficiency and to an increment of the energy barrier at ZnO surfaces, while at the same time it leaves unaffected the probability of exciton radiative recombination. Comparisons between the results obtained for different kind of topologies allow us to infer about thebasic fundamental mechanism underlying the effect, namely inhibition of free-excitons formation. (literal)

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