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Structural, optical, and magnetic properties of NiMoO4 nanorods prepared by microwave sintering.

de Moura AP, de Oliveira LH, Rosa IL, Xavier CS, Lisboa-Filho PN, Li MS, La Porta FA, Longo E, Varela JA - ScientificWorldJournal (2015)

Bottom Line: Experimental data were obtained by magnetization measurements for different applied magnetic fields.Optical properties were analyzed by ultraviolet-visible (UV-vis) and photoluminescence (PL) measurements.Our results revealed that the oxygen atoms occupy different positions and are very disturbed in the lattice and exhibit a particular characteristic related to differences in the length of the chemical bonds (Ni-O and Mo-O) of the cluster structure or defect densities in the crystalline α,β-NiMoO4 nanorods, which are the key to a deeper understanding of the exploitable physical and chemical properties in this study.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Química, UNESP, 14800-900 Araraquara, SP, Brazil.

ABSTRACT
We report on the structural, optical, and magnetic properties of α,β-NiMoO4 nanorods synthesized by annealing the NiMoO4:nH2O precursor at 600°C for 10 minutes in a domestic microwave. The crystalline structure properties of α,β-NiMoO4 were investigated using X-ray diffraction (XRD), Fourier transform infrared (FTIR), and Raman (FT-Raman) spectroscopies. The particle morphologies and size distributions were identified by field emission microscopy (FE-SEM). Experimental data were obtained by magnetization measurements for different applied magnetic fields. Optical properties were analyzed by ultraviolet-visible (UV-vis) and photoluminescence (PL) measurements. Our results revealed that the oxygen atoms occupy different positions and are very disturbed in the lattice and exhibit a particular characteristic related to differences in the length of the chemical bonds (Ni-O and Mo-O) of the cluster structure or defect densities in the crystalline α,β-NiMoO4 nanorods, which are the key to a deeper understanding of the exploitable physical and chemical properties in this study.

No MeSH data available.


(a) FTIR and (b) FT-Raman spectra of the α,β-NiMoO4 nanorods.
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fig3: (a) FTIR and (b) FT-Raman spectra of the α,β-NiMoO4 nanorods.

Mentions: Figures 3(a) and 3(b) illustrate the FTIR and FT-Raman spectra for the α,β-NiMoO4 powders synthesized via the precursor decomposition. According to the FTIR spectra shown in Figure 3(a), the presence of large bands was observed at 3470 cm−1 and 1622 cm−1, which could be associated with the stretching and flexing modes of the O-H linkages from the water molecules adsorbed in the sample surfaces. The bands at 962 and 882 cm−1 can be assigned to the symmetric and antisymmetric stretching of the Mo=O linkage and the band at 492 cm−1 could be associated with torsions of the Mo-O-Mo attachment. The bands at 808 and 706 cm−1, however, are assigned to the vibrations of the Mo-O-Ni (see Figure 3(a)). Figure 3(b) shows the FT-Raman spectra of the α,β-NiMoO4 powders indicating that the sample presents structural organization at short range. The results show that the band located at 952 cm−1 is associated with the symmetric stretching mode of Mo-O linkage. The bands at 900 and 826 cm−1 are due to the asymmetric stretching modes of the oxygen in O-Mo-O link. The bands observed at 380 cm−1 and 361 cm−1 are related to the bending modes of asymmetric and symmetric O-Mo-O. The band located at 733 cm−1 is due to the symmetric stretch of the bond Ni-Mo-O. There is also a band at around 261 cm−1 related to deformation modes of Mo-O-Mo linkage. Our results are in very good agreement with other published studies [36, 37, 40, 41].


Structural, optical, and magnetic properties of NiMoO4 nanorods prepared by microwave sintering.

de Moura AP, de Oliveira LH, Rosa IL, Xavier CS, Lisboa-Filho PN, Li MS, La Porta FA, Longo E, Varela JA - ScientificWorldJournal (2015)

(a) FTIR and (b) FT-Raman spectra of the α,β-NiMoO4 nanorods.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4352760&req=5

fig3: (a) FTIR and (b) FT-Raman spectra of the α,β-NiMoO4 nanorods.
Mentions: Figures 3(a) and 3(b) illustrate the FTIR and FT-Raman spectra for the α,β-NiMoO4 powders synthesized via the precursor decomposition. According to the FTIR spectra shown in Figure 3(a), the presence of large bands was observed at 3470 cm−1 and 1622 cm−1, which could be associated with the stretching and flexing modes of the O-H linkages from the water molecules adsorbed in the sample surfaces. The bands at 962 and 882 cm−1 can be assigned to the symmetric and antisymmetric stretching of the Mo=O linkage and the band at 492 cm−1 could be associated with torsions of the Mo-O-Mo attachment. The bands at 808 and 706 cm−1, however, are assigned to the vibrations of the Mo-O-Ni (see Figure 3(a)). Figure 3(b) shows the FT-Raman spectra of the α,β-NiMoO4 powders indicating that the sample presents structural organization at short range. The results show that the band located at 952 cm−1 is associated with the symmetric stretching mode of Mo-O linkage. The bands at 900 and 826 cm−1 are due to the asymmetric stretching modes of the oxygen in O-Mo-O link. The bands observed at 380 cm−1 and 361 cm−1 are related to the bending modes of asymmetric and symmetric O-Mo-O. The band located at 733 cm−1 is due to the symmetric stretch of the bond Ni-Mo-O. There is also a band at around 261 cm−1 related to deformation modes of Mo-O-Mo linkage. Our results are in very good agreement with other published studies [36, 37, 40, 41].

Bottom Line: Experimental data were obtained by magnetization measurements for different applied magnetic fields.Optical properties were analyzed by ultraviolet-visible (UV-vis) and photoluminescence (PL) measurements.Our results revealed that the oxygen atoms occupy different positions and are very disturbed in the lattice and exhibit a particular characteristic related to differences in the length of the chemical bonds (Ni-O and Mo-O) of the cluster structure or defect densities in the crystalline α,β-NiMoO4 nanorods, which are the key to a deeper understanding of the exploitable physical and chemical properties in this study.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Química, UNESP, 14800-900 Araraquara, SP, Brazil.

ABSTRACT
We report on the structural, optical, and magnetic properties of α,β-NiMoO4 nanorods synthesized by annealing the NiMoO4:nH2O precursor at 600°C for 10 minutes in a domestic microwave. The crystalline structure properties of α,β-NiMoO4 were investigated using X-ray diffraction (XRD), Fourier transform infrared (FTIR), and Raman (FT-Raman) spectroscopies. The particle morphologies and size distributions were identified by field emission microscopy (FE-SEM). Experimental data were obtained by magnetization measurements for different applied magnetic fields. Optical properties were analyzed by ultraviolet-visible (UV-vis) and photoluminescence (PL) measurements. Our results revealed that the oxygen atoms occupy different positions and are very disturbed in the lattice and exhibit a particular characteristic related to differences in the length of the chemical bonds (Ni-O and Mo-O) of the cluster structure or defect densities in the crystalline α,β-NiMoO4 nanorods, which are the key to a deeper understanding of the exploitable physical and chemical properties in this study.

No MeSH data available.