Preparation and Characterization of Ultrafine Rare Earth Molybdenum Complex Oxide Particles

Kuang, Wenxing; Fan, Yining; Yao, Kaiwen; Chen, Yi

doi:10.1006/jssc.1998.7900

Cited by 64 publications

(47 citation statements)

References 36 publications

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“…The chelated tin has six-fold coordination available for reacting while 4 fold is available in an inorganic starting material so its reactivity is greatly lowered [34,35]. The general formula is M(OOR)n (M-refers to Sn), and when sol was refluxed at 373 K, the solution changed slowly into gel; the controlled sol-gel process can be described as follows [36]:…”

Section: Resultsmentioning

confidence: 99%

Effect of Sintering Temperatures on the Synthesis of SnO2 Nanospheres

Pawar

Pinjari

Kolekar

et al. 2012

ISRN Chemical Engineering

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In this communication we report the rapid nanostructure of SnO 2 with a spherical morphology which has been prepared in large scale via sol-gel method. The products were characterized with scanning electron microscopy, X-ray powder diffraction, transmission electron microscopy, FTIR, and photoluminescence spectroscopy. The strong photoluminescence of the nanosphere in visible region suggested possible application in nanoscaled optoelectronic devices. A possible growth mechanism for the SnO 2 nanosphere in terms of solvation, hydrolysis, and polymerization was proposed.

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Section: Resultsmentioning

confidence: 99%

Effect of Sintering Temperatures on the Synthesis of SnO2 Nanospheres

Pawar

Pinjari

Kolekar

et al. 2012

ISRN Chemical Engineering

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“…The IR spectra of the gel indicate the presence of nitrates groups at 805, 897 and 1,052 cm -1 . The bands at 1,330-1,628 cm -1 can be attributed to the OH group in the metal alkoxides present in the gel [27,28]. The wide absorption band centred at 2,965-3,520 cm -1 corresponds to OH group, which is contributed by the water content present in the gel.…”

Section: X-ray Diffractionmentioning

confidence: 97%

Effects of Pb2+ ions concentration on the structure and PL intensity of Pb-doped ZnAl2O4 nanocrystals synthesized using sol–gel process

Motloung

Dejene

Swart

et al. 2014

J Sol-Gel Sci Technol

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Undoped and Pb 2? -doped ultrafine cubic zinc aluminate (ZnAl 2 O 4 ) hosts were successfully prepared at a relatively low temperature (*80°C) using the sol-gel method. The concentration of Pb 2? was varied from 0 to 5 mol%. The TGA showed that the minimum annealing temperature required to obtain single phase ZnAl 2 O 4 must be above 400°C. The XRD data revealed that all the annealed samples were single phase crystalline structures and the estimated crystallites size were in the range of 21-30 nm in diameter. The FTIR results suggest that heattreating can destroy some of the bonds. The surface morphology of the phosphors was influenced by the Pb 2? mol%. Undoped and Pb 2? -doped ZnAl 2 O 4 nanoparticles exhibit the violet emission at slightly different positions. The slight peak shifts suggests the possibilities that the luminescence centre can either be due to the defects level in the host or Pb 2? ions. The emission peaks at 390 and 399 nm are ascribed to the typical UV transitions 3 P 0,1 ? 1 S 0 in Pb 2? ion. At the higher Pb 2? mol%, the luminescence quenching behaviour occurs, which suggests that doping with Pb 2? ions is accompanied by the introduction of new defect sites that enhance non-radiative recombination of the excited electrons.

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“…After heat treatment at high temperature, crystalline Fe 2 (MoO 4 ) 3 can be formed; the particles, however, sinter and become larger, resulting in smaller BET surface area. In contrast, in the sol-gel process, due to the complex effect of citric acid on metallic ions (23,24), the hydrolysis and polymerization of metallic ions are controlled at a low rate; therefore, it is possible to form ultrafine particles from Fe-Mo gels at low temperature.…”

Section: Preparation Of Ultrafine Mixed Fe-mo Oxide Particlesmentioning

confidence: 93%

“…Ultrafine mixed Fe-Mo oxide particles were prepared by the sol-gel method as reported in the literature (19,23,24), in which citric acid was used as a complexing polyfunctional hydroxyacid. Ferric nitrate Fe(NO 3 ) 3 ⅐ 9H 2 O solution (0.02 mol/L), ammonium molybdate (NH 4 ) 6 Mo 7 O 24 ⅐ 6H 2 O solution (0.01 mol/L) and citric acid solution (0.03 mol/L), were prepared separately and then mixed with different molar ratios of citric acid to metallic ions.…”

Section: Sample Preparationmentioning

confidence: 99%