Cathodoluminescence Properties of Zno Thin Films

Addou, M.; Ebothé, J.; Hichou, A. El; Bougrine, A.; Bubendorff, Jean-Luc; Troyon, M.; Sofiani, Z.; Jouad, Mohamed El; Bahedi, K.; Lamrani, M. Alaoui

doi:10.5772/33737

Cited by 2 publications

(1 citation statement)

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“…Nonetheless, the Monte-Carlo simulation clearly shows the inuence of the geometry on the quenching efficiency. [29][30][31] Recent experimental studies have also showed that free excitons of ZnO nanowires possess diffusion lengths around 150 to 200 nm, although measured at low temperatures (5-8 K). 4, the nanowires always exhibit a higher probability for excitons to reach the surface than the thin lm.…”

Section: Resultsmentioning

confidence: 99%

ZnO nanowires as effective luminescent sensing materials for nitroaromatic derivatives

et al. 2013

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We report on the efficient room-temperature photoluminescence (PL) quenching of ZnO in the presence of 2,4-dinitrotoluene (DNT) vapor and for concentration as low as 180 ppb. Compared to ZnO thin films, ZnO nanowires exhibit a strong (95%) and fast (41 s) quenching of the PL intensity in the presence of DNT vapor. Assuming that the PL quenching is due to a trapping of the ZnO excitons by adsorbed DNT molecules, Monte-Carlo calculations show that the nanometric dimensions as well as the better crystallographic quality (longer mean free path) of the ZnO nanowires result in an enhanced trapping process at the origin of the improved sensing properties of the nanowires. The results demonstrate the importance of nanostructures in improving the sensitivity of ZnO. The study also reveals the sensing capability of ZnO nanowires and paves the path towards the potential realization of low-cost sub-ppb nitroaromatic derivative sensors.

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Section: Resultsmentioning

confidence: 99%