title: Transition-metal-doped ZnO nanoparticles: synthesis, characterization and photocatalytic activity under UV light.
abstract: ZnO nanoparticles doped with transition metals (Mn and Co) were prepared by a co-precipitation method. The synthesized nanoparticles were characterized using X-ray diffraction, scanning electron microscopy, energy dispersive X-rays, Fourier transform infrared spectroscopy, electron spin resonance spectroscopy and diffuse reflectance spectroscopy. The photocatalytic activities of the transition-metal-doped ZnO nanoparticles were evaluated in the degradation of methyl orange under UV irradiation. ZnO nanoparticles doped with 12 at.% of Mn and Co ions exhibited the maximum photodegradation efficiency. The experiment also demonstrated that the photodegradation efficiency of Mn-doped ZnO nanoparticles was higher than that of Co-doped ZnO nanoparticles. These results indicate that charge trapping states due to the doping were the decisive factor rather than the average particle size and energy gap. Moreover the effect of pH values on the degradation efficiency was discussed in the photocatalytic experiments using 12 at.% Mn- and Co-doped ZnO nanoparticles.
authors.affiliation: Departemen Fisika, Fakultas MIPA, Universitas Indonesia, 16424 Depok, Indonesia. Electronic address: rosari.saleh@ui.ac.id.
authors.forename: Rosari
authors.initials: R
authors.lastname: Saleh
authors.affiliation: Departemen Fisika, Fakultas MIPA, Universitas Indonesia, 16424 Depok, Indonesia.
authors.forename: Nadia Febiana
authors.initials: NF
authors.lastname: Djaja
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry; D004578:Electron Spin Resonance Spectroscopy; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008027:Light; D008345:Manganese / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology; D010777:Photochemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D007477:Ions; D008670:Metals; D003035:Cobalt; D008345:Manganese; C100258:methyl orange; D015034:Zinc Oxide
keywords: Characterization; Methyl orange; Photocatalytic activity; Transition-metal-doped ZnO nanoparticles; UV irradiation