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• W4386306750 abstract "Abstract NiO powders were synthesized using coprecipitation, sol‐gel, and hydrothermal synthesis methods. The powders were subjected to calcination in atmospheric air, followed by recalcination in an O 2 ‐rich atmosphere at 800°C for 2 h each. Characterization techniques, such as scanning electron microscopy, X‐ray diffraction, energy dispersive X‐ray spectroscopy, and microRaman spectroscopy, were utilized. The coprecipitation and hydrothermal methods resulted in disaggregated submicrometric particles. The average size of particles obtained by the coprecipitation method after calcination in atmospheric air and recalcination in an O 2 ‐rich atmosphere was 360 ± 140 nm and 400 ± 130 nm, respectively. Regarding the particles obtained by the hydrothermal method, the average size was 190 ± 50 and 220 ± 80 nm for calcined in atmospheric air and recalcined in O 2 ‐rich atmosphere, respectively. Conversely, the sol‐gel method produced particle aggregates with an average size of 430 ± 150 nm after calcination in atmospheric air and 500 ± 200 nm for calcination in an O 2 ‐rich atmosphere. X‐ray diffraction analysis revealed that only the hydrothermal method yielded pure NiO without additional Ni‐related phases, irrespective of the calcination procedure. In contrast, the coprecipitation sample exhibited a Ni 2 O 3 phase after calcination in atmospheric air, which disappeared after recalcination in an O 2 ‐rich atmosphere. The sol‐gel‐derived sample maintained a Ni phase after both calcination processes. Analysis of the crystallite size demonstrated an increase after recalcination in an O 2 ‐rich atmosphere for the hydrothermal and sol‐gel‐derived samples, while a decrease was observed for the coprecipitation‐derived sample. Raman spectra exhibited defect‐enabled first‐order forbidden phonon modes that were sensitive to the synthesis route. The two magnon phonon modes also demonstrated dependency on the route, indicating variations in defect structures. Photocatalytic evaluation using methylene blue degradation in aqueous solutions indicated better performance for the powders recalcined in an O 2 ‐rich atmosphere." @default.
• W4386306750 created "2023-09-01" @default.
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• W4386306750 date "2023-09-07" @default.
• W4386306750 modified "2023-10-09" @default.
• W4386306750 title "On the properties of NiO powders obtained by different wet chemical methods and calcination" @default.
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• W4386306750 doi "https://doi.org/10.1111/jace.19433" @default.
• W4386306750 hasPublicationYear "2023" @default.
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