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Room temperature radiolytic synthesized Cu@CuAlO(2)-Al(2)O(3) nanoparticles.

Abedini A, Saion E, Larki F, Zakaria A, Noroozi M, Soltani N - Int J Mol Sci (2012)

Bottom Line: Results of transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDX), and X-ray diffraction (XRD) showed that Cu@CuAlO(2)-Al(2)O(3) nanoparticles are in a core-shell structure.By controlling the absorbed dose and precursor concentration, nanoclusters with different particle sizes were obtained.The average particle diameter increased with increased precursor concentration and decreased with increased dose.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia; E-Mails: elias@science.upm.edu.my (E.S.); farhad.larki@gmail.com (F.L.); azmizak@science.upm.edu.my (A.Z.); monir_noroozi@yahoo.com (M.N.); nayereh.soltani@gmail.com (N.S.).

ABSTRACT
Colloidal Cu@CuAlO(2)-Al(2)O(3) bimetallic nanoparticles were prepared by a gamma irradiation method in an aqueous system in the presence of polyvinyl pyrrolidone (PVP) and isopropanol respectively as a colloidal stabilizer and scavenger of hydrogen and hydroxyl radicals. The gamma irradiation was carried out in a (60)Co gamma source chamber with different doses up to 120 kGy. The formation of Cu@CuAlO(2)-Al(2)O(3) nanoparticles was observed initially by the change in color of the colloidal samples from colorless to brown. Fourier transform infrared spectroscopy (FTIR) confirmed the presence of bonds between polymer chains and the metal surface at all radiation doses. Results of transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDX), and X-ray diffraction (XRD) showed that Cu@CuAlO(2)-Al(2)O(3) nanoparticles are in a core-shell structure. By controlling the absorbed dose and precursor concentration, nanoclusters with different particle sizes were obtained. The average particle diameter increased with increased precursor concentration and decreased with increased dose. This is due to the competition between nucleation, growth, and aggregation processes in the formation of nanoclusters during irradiation.

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TEM images of Cu@CuAlO2-Al2O3 nanoparticles with total ion concentration of: (a) 5.0 × 10−5 mol/mL and average size of 4.5 nm; (b) 5.7 × 10−5 mol/mL and average size of 10 nm; and (c) 6.4 × 10−5 mol/mL and average size of 13 nm at 120 kGy.
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f7-ijms-13-11941: TEM images of Cu@CuAlO2-Al2O3 nanoparticles with total ion concentration of: (a) 5.0 × 10−5 mol/mL and average size of 4.5 nm; (b) 5.7 × 10−5 mol/mL and average size of 10 nm; and (c) 6.4 × 10−5 mol/mL and average size of 13 nm at 120 kGy.

Mentions: The effect of precursor concentration on the formation of Cu@CuAlO2-Al2O3 nanoparticles was studied with varying concentrations of total ions: 5.0 × 10−5, 5.4 × 10−5, 5.7 × 10−5, 6.0 × 10−5, and 6.4 × 10−5 mol/mL at a constant concentration of PVP and at the fixed Al/Cu mole ratio of 70/30. In this mole ratio, the most probable case is the existence of a uniform core-shell structure of Cu@CuAlO2-Al2O3. Figure 7 shows the TEM results of the Cu@CuAlO2-Al2O3 nanoparticles obtained at various AlCl3 and CuCl2 concentrations. Only the TEM images for ion concentrations of 5.0 × 10−5, 5.7 × 10−5, and 6.4 × 10−5 mol/mL at 120 kGy are shown here. TEM results show the average size of Cu@CuAlO2-Al2O3 nanoparticles increases from 4.5 nm at the lowest ion concentration to 13 nm at the highest.


Room temperature radiolytic synthesized Cu@CuAlO(2)-Al(2)O(3) nanoparticles.

Abedini A, Saion E, Larki F, Zakaria A, Noroozi M, Soltani N - Int J Mol Sci (2012)

TEM images of Cu@CuAlO2-Al2O3 nanoparticles with total ion concentration of: (a) 5.0 × 10−5 mol/mL and average size of 4.5 nm; (b) 5.7 × 10−5 mol/mL and average size of 10 nm; and (c) 6.4 × 10−5 mol/mL and average size of 13 nm at 120 kGy.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC3472785&req=5

f7-ijms-13-11941: TEM images of Cu@CuAlO2-Al2O3 nanoparticles with total ion concentration of: (a) 5.0 × 10−5 mol/mL and average size of 4.5 nm; (b) 5.7 × 10−5 mol/mL and average size of 10 nm; and (c) 6.4 × 10−5 mol/mL and average size of 13 nm at 120 kGy.
Mentions: The effect of precursor concentration on the formation of Cu@CuAlO2-Al2O3 nanoparticles was studied with varying concentrations of total ions: 5.0 × 10−5, 5.4 × 10−5, 5.7 × 10−5, 6.0 × 10−5, and 6.4 × 10−5 mol/mL at a constant concentration of PVP and at the fixed Al/Cu mole ratio of 70/30. In this mole ratio, the most probable case is the existence of a uniform core-shell structure of Cu@CuAlO2-Al2O3. Figure 7 shows the TEM results of the Cu@CuAlO2-Al2O3 nanoparticles obtained at various AlCl3 and CuCl2 concentrations. Only the TEM images for ion concentrations of 5.0 × 10−5, 5.7 × 10−5, and 6.4 × 10−5 mol/mL at 120 kGy are shown here. TEM results show the average size of Cu@CuAlO2-Al2O3 nanoparticles increases from 4.5 nm at the lowest ion concentration to 13 nm at the highest.

Bottom Line: Results of transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDX), and X-ray diffraction (XRD) showed that Cu@CuAlO(2)-Al(2)O(3) nanoparticles are in a core-shell structure.By controlling the absorbed dose and precursor concentration, nanoclusters with different particle sizes were obtained.The average particle diameter increased with increased precursor concentration and decreased with increased dose.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia; E-Mails: elias@science.upm.edu.my (E.S.); farhad.larki@gmail.com (F.L.); azmizak@science.upm.edu.my (A.Z.); monir_noroozi@yahoo.com (M.N.); nayereh.soltani@gmail.com (N.S.).

ABSTRACT
Colloidal Cu@CuAlO(2)-Al(2)O(3) bimetallic nanoparticles were prepared by a gamma irradiation method in an aqueous system in the presence of polyvinyl pyrrolidone (PVP) and isopropanol respectively as a colloidal stabilizer and scavenger of hydrogen and hydroxyl radicals. The gamma irradiation was carried out in a (60)Co gamma source chamber with different doses up to 120 kGy. The formation of Cu@CuAlO(2)-Al(2)O(3) nanoparticles was observed initially by the change in color of the colloidal samples from colorless to brown. Fourier transform infrared spectroscopy (FTIR) confirmed the presence of bonds between polymer chains and the metal surface at all radiation doses. Results of transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDX), and X-ray diffraction (XRD) showed that Cu@CuAlO(2)-Al(2)O(3) nanoparticles are in a core-shell structure. By controlling the absorbed dose and precursor concentration, nanoclusters with different particle sizes were obtained. The average particle diameter increased with increased precursor concentration and decreased with increased dose. This is due to the competition between nucleation, growth, and aggregation processes in the formation of nanoclusters during irradiation.

Show MeSH