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  • 1.
    Epafini, Mauro
    et al.
    Istituto per la Microelettronica e i Microsistemi, IMM-CNR, Lecce, Italy.
    Kaciulis, Saulius
    Istituto per lo Studio dei Materiali Nanostrutturati, ISMN-CNR, Roma, Italy.
    Mezzi, Alessio
    Istituto per lo Studio dei Materiali Nanostrutturati, ISMN-CNR, Roma, Italy.
    Altamura, Davide
    Istituto di Cristallografia, IC-CNR, Bari, Italy.
    Giannini, Cinzia
    Istituto di Cristallografia, IC-CNR, Bari, Italy.
    Tang, Pengyi
    Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Barcelona, Catalonia, Spain; Catalonia Institute for Energy Research (IREC), Barcelona, Catalonia, Spain.
    Morante, Joan R.
    Catalonia Institute for Energy Research (IREC), Barcelona, Catalonia, Spain.
    Arbiol, Jordi
    Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Barcelona, Catalonia, Spain; ICREA, Barcelona, Catalonia, Spain.
    Siciliano, Pietro
    Istituto per la Microelettronica e i Microsistemi, IMM-CNR, Lecce, Italy.
    Comini, Elisabetta
    Department of Information Engineering, Brescia University, Brescia, Italy; SENSOR, Brescia University & CNR INO, Brescia, Italy.
    Concina, Isabella
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Solvothermal Synthesis, Gas-Sensing Properties, and Solar Cell-Aided Investigation of TiO2-MoOx Nanocrystals2017In: ChemNanoMat, ISSN 2199-692X, Vol. 3, no 11, p. 798-807Article in journal (Refereed)
    Abstract [en]

    Titania anatase nanocrystals were prepared by sol-gel/solvothermal synthesis in oleic acid at 250 °C, and modified by co-reaction with Mo chloroalkoxide, aimed at investigating the effects on gas-sensing properties induced by tailored nanocrystals surface modification with ultra-thin layers of MoOx species. For the lowest Mo concentration, only anatase nanocrystals were obtained, surface modified by a disordered ultra-thin layer of mainly octahedral MoVI oxide species. For larger Mo concentrations, early MoO2 phase segregation occurred. Upon heat treatment up to 500 °C, the sample with the lowest Mo concentration did not feature any Mo oxide phase segregation, and the surface Mo layer was converted to dense octahedral MoVI oxide. At larger Mo concentrations all segregated MoO2 was converted to MoO3. The two different materials typologies, depending on the Mo concentration, were used for processing gas-sensing devices and tested toward acetone and carbon monoxide, which gave a greatly enhanced response, for all Mo concentrations, to acetone (two orders of magnitude) and carbon monoxide with respect to pure TiO2. For the lowest Mo concentration, dye-sensitized solar cells were also prepared to investigate the influence of anatase surface modification on the electrical transport properties, which showed that the charge transport mainly occurred in the ultra-thin MoOx surface layer.

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