Listar QFA_Articles por autoría "0039c3cd-a5a7-4687-9b5b-97007be4ef9a"

Mostrando ítems 1-12 de 12

    • openAccess   A novel ozone gas sensor based on one-dimensional (1D) α-Ag2WO4 nanostructures 

      Da Silva, Luis F.; Catto, Ariadne C.; Avansi, Waldir; Cavalcante, Laécio Santos; Andres, Juan; Aguir, Khalifa; Mastelaro, Valmor Roberto; Longo, Elson Royal Society of Chemistry (2014-01)
      This paper reports on a new ozone gas sensor based on α-Ag2WO4 nanorod-like structures. Electrical resistance measurements proved the efficiency of α-Ag2WO4 nanorods, which rendered good sensitivity even for a low ozone ...

    • openAccess   Acetone gas sensor based on α-Ag2WO4 nanorods obtained via a microwaveassisted hydrothermal route 

      Da Silva, Luis F.; Catto, Ariadne C.; Avansi, Waldir; Cavalcante, Laécio Santos; Mastelaro, Valmor Roberto; Andres, Juan; Aguir, Khalifa; Longo, Elson Elsevier (2016)
      This manuscript addresses the synthesis of one-dimensional (1D) α-Ag2WO4 nanorod-like structures via a microwave-assisted hydrothermal method to be used as an acetone gas sensor. The nanorods showed excellent gas-sensing ...

    • closedAccess   An improved method for preparation of SrTiO3 nanoparticles 

      Da Silva, Luis F.; Maia, Lauro; Bernardi, Maria Inês B.; Andres, Juan; Mastelaro, Valmor Roberto Elsevier (2011)
      SrTiO3 nanoparticles were synthesized for the first time via a modified polymeric precursor method. The samples were characterized by thermogravimetry, X-ray diffraction (XRD), BET surface area, micro-Raman spectroscopy, ...

    • openAccess   Fingerprints of Short-Range and Long-Range Structure in BaZr1−xHfxO3 Solid Solutions: An Experimental and Theoretical Study 

      Uarth Fassbender, Rafael; Strelow Lilge, Tatiane; Cava, Sergio; Andres, Juan; Da Silva, Luis F.; Mastelaro, Valmor Roberto; Longo, Elson; Moreira, Mario Lucio Royal Society of Chemistry (2015)
      A microwave-assisted hydrothermal method was applied to synthesize BaZr1xHfxO3, (BZHO) solid solutions at a low temperature, 140 1C, and relatively short times, 160 min. The detailed features of the crystal structure, ...

    • closedAccess   Improving the ozone gas-sensing properties of CuWO4 nanoparticles 

      Catto, Ariadne C.; Fiorido, Tomas; Souza, Érica L.S.; Avansi, Waldir; Andres, Juan; Aguir, Khalifa; Longo, Elson; Cavalcante, Laécio Santos; Da Silva, Luis F. Elsevier (2018-06)
      This paper consists of an experimental investigation on the effects of annealing temperature on the structural, surface and ozone gas-sensing properties of CuWO4 nanoparticles prepared via a sonochemical route. X-ray ...

    • closedAccess   Insight into the Effects of Fe Addition on the Local Structure and Electronic Properties of SrTiO3 

      Da Silva, Luis F.; M’Peko, Jean Claude; Andres, Juan; Beltran, Armando; Gracia, Lourdes; Bernardi, Maria Inês B.; Mesquita, Alexandre; Antonelli, Eduardo; Moreira, Mario Lucio; Mastelaro, Valmor Roberto American Chemical Society (2014-01)
      This paper reports an experimental and theoretical investigation of the effects of adding Fe to the perovskite strontium titanate SrTiO3. The effects include changes in the short-order range structure as well as in the ...

    • closedAccess   Long-range and short-range structures of cube-like shape SrTiO3 powders: microwave-assisted hydrothermal synthesis and photocatalytic activity 

      Da Silva, Luis F.; Avansi, Waldir; Andres, Juan; Ribeiro, Caue; Moreira, Mario Lucio; Longo, Elson; Mastelaro, Valmor Roberto Royal Society of Chemistry (2013)
      We report herein a detailed study on the influence of microwave-assisted hydrothermal (MAH) treatment time on both long and short range structures around Ti atoms of SrTiO3 powders. Few studies have been carried out on ...

    • closedAccess   Novel SrTi1−xFexO3 nanocubes synthesized by microwave-assisted hydrothermal method 

      Da Silva, Luis F.; Avansi, Waldir; Moreira, Mario Lucio; Andres, Juan; Longo, Elson; Mastelaro, Valmor Roberto Royal Society of Chemistry (2012-03)
      We report herein for the first time a facile synthesis method to obtain SrTi1−xFexO3 nanocubes by means by a microwave-assisted hydrothermal (MAH) method at 140 °C. The effect of iron addition on the structural and ...

    • openAccess   Relationship between Crystal Shape, Photoluminescence, and Local Structure in SrTiO3 Synthesized by Microwave-Assisted Hydrothermal Method 

      Da Silva, Luis F.; Avansi, Waldir; Moreira, Mario Lucio; Mesquita, Alexandre; Maia, Lauro; Andres, Juan; Longo, Elson; Mastelaro, Valmor Roberto Hindawi Publishing Corporation (2012)
      This paper describes the effect of using different titanium precursors on the synthesis and physical properties of SrTiO3 powders obtained by microwave-assisted hydrothermal method. X-ray diffraction measurements, X-ray ...

    • openAccess   The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate 

      Catto, Ariadne C.; Ferrer, Mateus M.; Lopes, Osmando; Mastelaro, Valmor Roberto; Andres, Juan; Da Silva, Luis F.; Longo, Elson; Avansi, Waldir Elsevier (2020-11-01)
      In this contribution, we present an experimental and theoretical investigation of the role of counter-ions in the crystal morphology, surface structure, and photocatalytic activity of hierarchical ZnO nanostructures. The ...

    • closedAccess   Towards a white-emitting phosphor Ca10V6O25 based material 

      Teixeira, Mayara Mondego; Galvão Gobato, Yara; Gracia, Lourdes; Da Silva, Luis F.; Avansi, Waldir; Assis, Marcelo de; Oliveira, Regiane; Prando, Gabriela Augusta; Andres, Juan; Longo, Elson Elsevier (2019-12-27)
      To achieve a stable material capable of white-light emission, we fabricated Ca10V6O25 by both co-precipitation (CP) and microwave-assisted hydrothermal (MAH) methods at different temperatures. The effects of structural ...

    • openAccess   Unveiling the efficiency of microwave-assisted hydrothermal treatment for the preparation of SrTiO3 mesocrystals 

      Da Silva, Luis F.; Catto, Ariadne C.; Avansi, Waldir; Mesquita, Alexandre; Maia, Lauro; Lopes, Osmando; Li, Máximo Siu; Moreira, Mario Lucio; Longo, Elson; Andres, Juan; Mastelaro, Valmor Roberto Royal Society of Chemistry (2019-09-16)
      Material processing has become essential for the proper control, tuning and consequent application of the properties of micro/nanoparticles. In this case, we report herein the capability of the microwaveassisted hydrothermal ...