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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Monteiro, T.
University of Aveiro
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2024Roughness evaluation of Ti6Al4V bulks produced by laser powder directed energy deposition and micro-milled for biomedical applications
- 2021Dual Transduction of H2O2 Detection Using ZnO/Laser-Induced Graphene Compositescitations
- 2021Eu3+ optical activation engineering in Al Ga1-N nanowires for red solid-state nano-emitterscitations
- 2018Defect formation and optical activation of Tb implanted AlxGa1−xN films using channeled implantation at different temperaturescitations
- 2017Hybridization of zinc oxide tetrapods for selective gas sensing applicationscitations
- 2015Effect of polymeric matrix on morphology and photoelectric properties of polymer-quantum dots nanocomposites
- 2010Erbium-doped nanocrystalline silicon thin films produced by RF sputtering: annealing effect on the ER emissioncitations
- 2008The effects of ZnO coating on the photoluminescence properties of porous silicon for the advanced optoelectronic devicescitations
- 2007Visible and infrared photoluminescence from erbium-doped silicon nanocrystals produced by rf sputtering
- 2007ZnO films grown by laser ablation with and without oxygen CVDcitations
- 2006Erbium-doped silicon nanocrystals grown by r.f. sputtering method: competition between oxygen and silicon to get erbiumcitations
- 2006Study of the oxygen role in the photoluminescence of erbium doped nanocrystalline silicon embedded in a silicon amorphous matrixcitations
- 2006Layer-by-layer deposition of organically capped quantum dots
- 2005A green-emitting CdSe/poly(butyl acrylate) nanocompositecitations
- 2005Polymer encaopsulation of CdE (E= S, Se) quantum dots ensembles via in situ radical polymerization in miniemulsioncitations
- 2005A green-emitting CdSe/Poly(butyl acrylate) nanocompositecitations
- 2003Influence of crystals distribution on the photoluminescence properties of nanocrystalline silicon thin filmscitations
- 2002Erbium implantation in strontium titanatecitations
- 2002Optical properties of the synthetic nanocomposites SiO2/CdS/ poly(styrene-co-maleic anhydride) and SiO2/CdS/ poly(styrene-co-maleimide)citations
Places of action
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article
Hybridization of zinc oxide tetrapods for selective gas sensing applications
Abstract
<p>In this work, the exceptionally improved sensing capability of highly porous three-dimensional (3-D) hybrid ceramic networks toward reducing gases is demonstrated for the first time. The 3-D hybrid ceramic networks are based on doped metal oxides (MexOy and ZnxMe1-xOy, Me = Fe, Cu, Al) and alloyed zinc oxide tetrapods (ZnO-T) forming numerous junctions and heterojunctions. A change in morphology of the samples and formation of different complex microstructures is achieved by mixing the metallic (Fe, Cu, Al) microparticles with ZnO-T grown by the flame transport synthesis (FTS) in different weight ratios (ZnO-T:Me, e.g., 20:1) followed by subsequent thermal annealing in air. The gas sensing studies reveal the possibility to control and change/tune the selectivity of the materials, depending on the elemental content ratio and the type of added metal oxide in the 3-D ZnO-T hybrid networks. While pristine ZnO-T networks showed a good response to H2 gas, a change/tune in selectivity to ethanol vapor with a decrease in optimal operating temperature was observed in the networks hybridized with Fe-oxide and Cu-oxide. In the case of hybridization with ZnAl2O4, an improvement of H2 gas response (to ∼7.5) was reached at lower doping concentrations (20:1), whereas the increase in concentration of ZnAl2O4 (ZnO-T:Al, 10:1), the selectivity changes to methane CH<sub>4</sub> gas (response is about 28). Selectivity tuning to different gases is attributed to the catalytic properties of the metal oxides after hybridization, while the gas sensitivity improvement is mainly associated with additional modulation of the electrical resistance by the built-in potential barriers between n-n and n-p heterojunctions, during adsorption and desorption of gaseous species. Density functional theory based calculations provided the mechanistic insights into the interactions between different hybrid networks and gas molecules to support the experimentally observed results. The studied networked materials and sensor structures performances would provide particular advantages in the field of fundamental research, applied physics studies, and industrial and ecological applications.</p>