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    Epitaxial-like Growth of Co3O4/ZnO Quasi-1D Nanocomposites

    Year: 2012

    Journal: Crystal growth and design, 2012, 12 (10) pp 5119-5124, 20130115

    Authors: Daniela Bekermann, Alberto Gasparotto, Davide Barreca, Chiara Maccato, Marco Rossi, Roberto Matassa, Ilaria Cianchetta, Silvia Orlanducci, Marko Kete, Urška Lavrenčič Štangar

    Organizations: Department of Chemistry, Padova University and INSTM, Via Marzolo 1, 35131 Padova, Italy, CNR-ISTM and INSTM, Department of Chemistry, Padova University, Via Marzolo 1, 35131 Padova, Italy, Department of Basic and Applied Sciences for Engineering (FASE), Research Center for Nanotechnologies Applied to the Engineering, University of Rome ‘La Sapienza’, Via Scarpa 14, 00161 Rome, Italy, Department of Chemical Science and Technology and MINAS Lab, University of Rome ‘Tor Vergata’, Via della Ricerca Scientifica, 00133 Rome, Italy, Laboratory for Environmental Research, University of Nova Gorica, Vipavska 13, 5001 Nova Gorica, Slovenia

    The development of quasi-1D Co3O4/ZnO nanocomposites by a two-step plasma enhanced-chemical vapor deposition (PE-CVD) process is presented. Arrays of 001 oriented ZnO nanorods were first grown on Si(100) and subsequently used as templates for the PE-CVD of Co3O4, whose amount was tailored as a function of deposition time. The obtained composites were thoroughly characterized by means of a multitechnique approach, involving field emission-scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDXS), micro-Raman and Fourier-transform infrared (FT-IR) spectroscopies, X-ray photoelectron and X-ray excited Auger electron spectroscopies (XPS, XE-AES), glancing incidence X-ray diffraction (GIXRD), and reflection high energy electron diffraction (RHEED). The use of moderate deposition temperatures (≤300 °C), together with the unique activation provided by nonequilibrium plasmas, prevented undesired solid-state reactions between the two oxides and promoted Co3O4 growth on the tips of vertically aligned ZnO nanostructures. In particular, the resulting quasi-1D Co3O4/ZnO composites were characterized by an interface epitaxial-like relationship, an important issue for the development of semiconductor-based functional nanosystems. Photoinduced hydrophilic (PH) and photocatalytic (PC) performances of the present nanocomposites were preliminarily investigated, showing attractive results toward the possible fabrication of advanced smart materials.