title: Room temperature radiolytic synthesized Cu@CuAlO(2)-Al(2)O(3) nanoparticles.
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.
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
authors.forename: Alam
authors.initials: A
authors.lastname: Abedini
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
authors.forename: Elias
authors.initials: E
authors.lastname: Saion
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
authors.forename: Farhad
authors.initials: F
authors.lastname: Larki
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
authors.forename: Azmi
authors.initials: A
authors.lastname: Zakaria
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
authors.forename: Monir
authors.initials: M
authors.lastname: Noroozi
authors.affiliation: Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
authors.forename: Nayereh
authors.identifier: 0000-0002-0961-3415
authors.initials: N
authors.lastname: Soltani
mesh_terms: D019840:2-Propanol / Q000737:chemistry; D017607:Aluminum Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D003102:Colloids / Q000138:chemical synthesis / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D005720:Gamma Rays; D053758:Nanoparticles / Q000737:chemistry*; D011205:Povidone / Q000737:chemistry
chemical_list: D017607:Aluminum Compounds; D003102:Colloids; D003300:Copper; D011205:Povidone; D019840:2-Propanol
keywords: colloidal Cu@CuAlO2-Al2O3 nanoparticles; core-shell structure; gamma radiolytic method; polyvinyl pyrrolidone (PVP)