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• Abedini, A
• Saion, E
• Larki, F
• Zakaria, A
• Noroozi, M
• Soltani, N
• [+] on Google Scholar
• Abedini, A
• Saion, E
• Larki, F
• Zakaria, A
• Noroozi, M
• Soltani, N
• [+] on PubMed
• Abedini, A
• Saion, E
• Larki, F
• Zakaria, A
• Noroozi, M
• Soltani, N

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Int. J. Mol. Sci. 2012, 13(9), 11941-11953; doi:10.3390/ijms130911941

Article

Room Temperature Radiolytic Synthesized Cu@CuAlO₂-Al₂O₃ Nanoparticles

Alam Abedini* , Elias Saion, Farhad Larki, Azmi Zakaria, Monir Noroozi and Nayereh Soltani

Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia

* Author to whom correspondence should be addressed.

Received: 7 July 2012; in revised form: 2 September 2012 / Accepted: 9 September 2012 / Published: 20 September 2012

(This article belongs to the Section Material Sciences and Nanotechnology)

Download PDF Full-Text [1889 KB, uploaded 20 September 2012 11:23 CEST]

Abstract: Colloidal Cu@CuAlO₂-Al₂O₃ 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 ⁶⁰Co gamma source chamber with different doses up to 120 kGy. The formation of Cu@CuAlO₂-Al₂O₃ 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@CuAlO₂-Al₂O₃ 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.

Keywords: colloidal Cu@CuAlO₂-Al₂O₃ nanoparticles; polyvinyl pyrrolidone (PVP); gamma radiolytic method; core-shell structure

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