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Core@shell, Au@TiO x nanoparticles by gas phase synthesis

2017; Royal Society of Chemistry; Volume: 9; Issue: 19 Linguagem: Inglês

10.1039/c7nr01148b

2040-3372

L. Martı́nez, Álvaro Mayoral, M. Espiñeira, E. Román, F. J. Palomares, Yves Huttel,

Nanocluster Synthesis and Applications

Herein, gas phase synthesis and characterization of multifunctional core@shell, Au@TiOx nanoparticles have been reported. The nanoparticles were produced via a one-step process using a multiple-ion cluster source under a controlled environment that guaranteed the purity of the nanoparticles. The growth of the Au cores (6 nm diameter) is stopped when they pass through the Ti plasma where they are covered by an ultra-thin (1 nm thick) and homogeneous titanium shell that is oxidized in-flight before the soft-landing of the nanoparticles. The Au cores were found to be highly crystalline with icosahedral (44%) and decahedral (66%) structures, whereas the shell, mainly composed of TiO2 (79%), was not ordered. The highly electrical insulating behaviour of the titanium oxide shell was confirmed by the charging effect produced during X-ray photoemission spectroscopy.