ZrO2-Al2O3 nanocomposite: Synthesis, characterization and influence of electron beam irradiation on the structural and PL properties

Composite NOx sensors were fabricated by combining partially and fully stabilized yttria-doped zirconia with alumina forming a composite electrolyte, Y2O3-ZrO2-Al2O3, and strontium-doped lanthanum manganese oxide mixed with gold to form the composite sensing electrode, La0.8 Sr0.2MnO3-Au. A surface chemistry analysis of the composite sensor was conducted to interpret defects and the structural phases present at the Y2O3-ZrO2-Al2O3 electrolyte, as well as the charge conduction mechanism at the LaSrMnO3-Au electrode surface. Based on the surface chemistry analysis, ionic and electronic transport properties, and microstructural features of sensor components, the working principle was described for NOx sensing at the composite sensor. The role of the composite materials on the NOx sensing response, cross-sensitivity to O2, H2O, CO, CO2, and CH4, and the response/recovery rates relative to sensor accuracy were characterized by operating the composite NOx sensors via the impedimetric method. The composite sensors were operated at temperatures ranging from 575 to 675 °C in dry and humidified gas environments with NO and NO2 concentrations varying from 0 to 100 ppm, where the balance gas was N2. It was found that the microstructure of the composite NOx sensor electrolyte and sensing electrode had a significant effect on interfacial reactions at the triple phase boundary, as well as the density of active sites for oxygen reactions. Overall, the composite NOx sensor microstructure enabled a high NOx sensing response, along with low cross-sensitivity to O2, CO, CO2, and CH4, and promoted NO detection down to 2 ppm.

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“…71-1123) with space group R

c [ 36 , 37 , 38 ]. The average crystallite size obtained for ∝-Al 2 O 3 via the Scherrer equation was near 26 nm [ 36 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Investigation of an Impedimetric LaSrMnO3-Au/Y2O3-ZrO2-Al2O3 Composite NOx Sensor

et al. 2022

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“…A zirconia-alumina ZrO 2 –Al 2 O 3 composite, which can have various applications related to its corrosion and shock resistance, high melting point, etc., was irradiated with 15 MeV electrons for 60 min at atmospheric pressure and low temperature (10 °C). 32 The composite consists of zirconia and alumina nanocrystals, which are miscible to a considerable amount. X-ray diffraction studies have shown that, before irradiation, the size of zirconia grains is 20 nm while the electron irradiation slightly reduced the size to 18 nm.…”

Section: Electron and Neutron Irradiation Of Nanostructured Oxidesmentioning

confidence: 99%

Electron and Neutron Beam Irradiation Effects in Homogeneous and Nanostructured Oxides

Nesheva

2023

ACS Omega

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Oxide-based materials have a variety of applications in chemical sensing and photocatalysis, thin-film transistors, complex-oxide field-effect transistors, nonvolatile memories, resistive switching, energy conversion, topological oxide electronics, and many others. The radiation resistance of these materials in such devices plays an important role in device operation in radiation environment, and this attracts much attention in the research area. In spite of damage in a number of cases high-energy particles may have a beneficial effect on the target. In this mini-review article examples of both creation of defects and beneficial changes in the structure and properties of homogeneous and nanostructured oxides caused by high-energy electron and neutron irradiation are given by considering some recently published results. First, the attention is turned to ionizing and displacement effects of electron and neutron irradiation in homogeneous bulk and thin-film oxides reported in the literature. Then, the effect of electron and neutron irradiation on nanostructured oxides and semiconductor nanoparticles embedded in an oxide matrix is regarded. Considerable attention is paid to silicon oxide layers since they are widely used in microelectronic products, which are among the most manufactured devices in human history. Processes of irradiation-induced lattice rearrangement, compositional changes, growth of nanoparticles and their size reduction, creation of point defects and their complexes, electron−hole generation, and charge trapping are discussed.

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A Novel SrZr(PO4)2:Dy2O3 Solid Solution for Photoluminescence and Super Capacitor Applications

Thiruveni,

Mathammal,

Ponkumar

et al. 2024

Braz J Phys

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ZrO2-Al2O3 nanocomposite: Synthesis, characterization and influence of electron beam irradiation on the structural and PL properties

Cited by 4 publications

References 14 publications

Investigation of an Impedimetric LaSrMnO3-Au/Y2O3-ZrO2-Al2O3 Composite NOx Sensor

Investigation of an Impedimetric LaSrMnO3-Au/Y2O3-ZrO2-Al2O3 Composite NOx Sensor

Electron and Neutron Beam Irradiation Effects in Homogeneous and Nanostructured Oxides

A Novel SrZr(PO4)2:Dy2O3 Solid Solution for Photoluminescence and Super Capacitor Applications

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