Characterization and photoluminescence properties of ultrafine copper molybdate (α-CuMoO4) powders prepared via a combustion-like process |
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作者姓名: | Mohamed Benchikhi Rachida El Ouatib Sophie Guillemet-Fritsch Lahcen Er-Rakho Bernard Durand |
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作者单位: | Laboratoire de Physico-Chimie des Matériaux Inorganiques, Faculté des Sciences Ain Chock, Université Hassan II Casablanca, Casablanca, Morocco |
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基金项目: | two French?Moroccan pro-jects;Projet de Recherches Convention Internationale du CNRS |
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摘 要: | We report a simple method for preparing copper(II) molybdate (CuMoO4) powders via a combustion-like process. A gel was first prepared by the polymerizable complex method, where citric acid was used as a complexing and polymerizing agent and nitric acid was used as an oxidizing agent. The thermal decomposition behavior of the (CuMo)-precursor gel was studied by thermogravimetry–differential thermal analysis (TG–DTA), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). We observed that the crystallization of CuMoO4 powder was completed at 450°C. The obtained homogeneous powder was composed of grains with sizes in the range from 150 to 500 nm and exhibited a specific surface area of approximately 5 m2/g. The average grain size increased with increasing annealing temperature. The as-prepared CuMoO4 crystals showed a strong green photoluminescence emission at room temperature under excitation at 290 nm, which we mainly interpreted on the basis of the Jahn-Teller effect on MoO42- ] complex anions. We also observed that the photoluminescence intensity increased with increasing crystallite size.
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关 键 词: | copper molybdate chemical synthesis photoluminescence Jahn-Teller effect |
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