Listar por autoría "b94e10f6-0096-4015-8074-9be8a034027c"

Mostrando ítems 1-14 de 14

    • 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   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 ...

    • openAccess   In situ Transmission Electron Microscopy observation of Ag nanocrystal evolution by surfactant free electron-driven synthesis 

      Longo, Elson; Avansi, Waldir; Bettini, Jefferson; Andres, Juan; Gracia, Lourdes Nature Publishing Group (2016)
      The study of the interaction of electron irradiation with matter and the response of the material to the passage of electrons is a very challenging problem. However, the growth mechanism observed during nanostructural ...

    • 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 ...

    • closedAccess   Potentiated Electron Transference in a-Ag2WO4 Microcrystals with Ag Nanofilaments as Microbial Agent 

      Longo, V. M.; Foggi, Camila Cristina; Ferrer, Mateus M.; Gouveia, Amanda; André, Rafaela S.; Avansi, Waldir; Vergani, Carlos; Machado Maciel, Ana Lúcia; Andres, Juan; Cavalcante, Laécio Santos; Hernandes, Antônio C.; Longo, Elson American Chemical Society (2014-02)
      This study is a framework proposal for understanding the antimicrobacterial effect of both α-Ag2WO4 microcrystals (AWO) synthesized using a microwave hydrothermal (MH) method and α-Ag2WO4 microcrystals with Ag metallic ...

    • closedAccess   Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation. 

      Beltran, Armando; Andres, Juan; Gracia, Lourdes; Longo, V. M.; Cavalcante, Laécio Santos; Avansi, Waldir; Li, Maximo Siu; Mastelaro, Valmor Roberto; Varela, José A.; Longo, Elson © American Institute of Physics (2011-08)
      By combining experimental techniques such as x-ray diffraction, Fourier transform Raman, ultraviolet-visible, x-ray absorption near edge structure, extended x-ray absorption fine structure spectroscopy, and theoretical ...

    • closedAccess   Quantum Mechanics Insight into the Microwave Nucleation of SrTiO3 Nanospheres 

      Moreira, Mario Lucio; Longo, V. M.; Avansi, Waldir; Ferrer, Mateus M.; Andres, Juan; Mastelaro, Valmor Roberto; Varela, José A.; Longo, Elson American Chemical Society (2012)
      An extensive investigation of strontium titanate, SrTiO3 (STO), nanospheres synthesized via a microwave-assisted hydrothermal (MAH) method has been conducted to gain a better insight into thermodynamic, kinetic, and reaction ...

    • 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   Structural and electronic analysis of the atomic scale nucleation of Ag on α-Ag2WO4 induced by electron irradiation 

      Andres, Juan; Gracia, Lourdes; González Navarrete, Patricio; Longo, V. M.; Avansi, Waldir; Volanti, Diogo P.; Ferrer, Mateus M.; Lemos, Pablo S.; La Porta, Felipe A.; Hernandes, Antônio C.; Longo, Elson Nature Publishing Group (2014-06)
      In this work, we utilise a combination of theory, computation and experiments to understand the early events related to the nucleation of Ag filaments on α-Ag2WO4 crystals, which is driven by an accelerated electron beam ...

    • 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 ...