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Issue 38, 2013
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Metal loading determines the stabilization pathway for Co2+ in titanate nanowires: ion exchange vs. cluster formation

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Abstract

Co nanoparticles were produced and characterized on protonated titanate nanowires. Co deposits were obtained after low-temperature decomposition of Co2(CO)8 on titanate nanostructures. The carbonylation was carried out by vapor-phase adsorption in a fluidized bed reactor and the decarbonylation processes were followed by FT-IR spectroscopy and microbalance combined with temperature programmed reaction mass spectrometry. The band gap of Co-decorated titanate nanostructures determined by UV-VIS diffuse reflectance spectroscopy decreased sharply from 3.14 eV to 2.41 eV with increasing Co content up to 2 wt%. The Co-decorated titanate morphology was characterized by high-resolution transmission electron microscopy (HRTEM) and electron diffraction (ED). The chemical environment of Co deposition was studied by photoelectron spectroscopy (XPS). A certain amount of cobalt underwent an ion exchange process. Higher cobalt loadings led to the formation of nanosized-dispersed particles complexed to oxygen vacancies. The average sizes were found to be mostly between 2 and 6 nm. This size distribution and the measured band gap could be favorable regimes for some important low-temperature thermal- and photo-induced catalytic reactions.

Graphical abstract: Metal loading determines the stabilization pathway for Co2+ in titanate nanowires: ion exchange vs. cluster formation

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Publication details

The article was received on 09 Apr 2013, accepted on 24 Jul 2013 and first published on 25 Jul 2013


Article type: Paper
DOI: 10.1039/C3CP51502H
Citation: Phys. Chem. Chem. Phys., 2013,15, 15917-15925
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    Metal loading determines the stabilization pathway for Co2+ in titanate nanowires: ion exchange vs. cluster formation

    D. Madarász, G. Pótári, A. Sápi, B. László, C. Csudai, A. Oszkó, Á. Kukovecz, A. Erdőhelyi, Z. Kónya and J. Kiss, Phys. Chem. Chem. Phys., 2013, 15, 15917
    DOI: 10.1039/C3CP51502H

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