Listar por autoría "27b13db0-cc2a-47e2-80fa-3e27b286bcb8"

Mostrando ítems 1-20 de 24

    • openAccess   A combined theoretical and experimental study of electronic structure and optical properties of β-ZnMoO4 microcrystals 

      Cavalcante, Laécio Santos; Moraes, E.; Almeida, M.A.P.; Dalmaschio, C.J.; Batista, N.C.; Varela, José A.; Longo, Elson; Siu Li, Maximo; Andres, Juan; Beltran, Armando Elsevier (2013)
      In this paper, a combined theoretical and experimental study on the electronic structure and photoluminescence (PL) properties of beta zinc molybdate ( -ZnMoO4) microcrystals synthesized by the hydrothermal method has ...

    • openAccess   A joint experimental and theoretical study on the electronic structure and photoluminescence properties of Al2(WO4)3 powders 

      Batista, F. M.C.; La Porta, Felipe A.; Gracia, Lourdes; Cerdeiras, E.; Mestres, L.; Siu Li, Maximo; Batista, N.C.; Andres, Juan; Longo, Elson; Cavalcante, Laécio Santos Elsevier (2015-02)
      In this paper, aluminum tungstate Al2(WO4)3 powders were synthesized using the co-precipitation method at room temperature and then submitted to heat treatment processes at different temperatures (100, 200, 400, 800, and ...

    • closedAccess   A Joint Experimental and Theoretical Study on the Nanomorphology of CaWO4 Crystals 

      Longo, V. M.; Gracia, Lourdes; Stroppa, Daniel G.; Cavalcante, Laécio Santos; Orlandi, Marcelo; Ramírez, Antonio J.; Leite, Edson R.; Andres, Juan; Beltran, Armando; Varela, José A.; Longo, Elson ACS (2011-08)
      By the joint use of experimental techniques such as field emission scanning electron microscopy (FEG-SEM), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HR-TEM) and ab initio ...

    • 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 ...

    • openAccess   Direct in situ observation of the electron-driven synthesis of Ag filaments on a-Ag2WO4 crystals 

      Longo, Elson; Cavalcante, Laécio Santos; Volanti, Diogo P.; Gouveia, Amanda; Longo, V. M.; Varela, José A.; Orlandi, Marcelo; Andres, Juan Nature Publishing group (2013)
      In this letter, we report, for the first time, the real-time in situ nucleation and growth of Ag filaments on α-Ag2WO4 crystals driven by an accelerated electron beam from an electronic microscope under high vacuum. We ...

    • openAccess   Disclosing the Biocide Activity of α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) Solid Solutions 

      Llusar, Rosa; Andres, Juan; Gouveia, Amanda; Guillamón, Eva; Sorribes, Iván; Pereira, Paula; Foggi, Camila Cristina; Pinatti, Ivo M; Cabral, Luís; San-Miguel, Miguel A.; Vergani, Carlos; Simões, Alexandre; Silva, Edison; Cavalcante, Laécio Santos; Longo, Elson MDPI (2022-09-11)
      n this work, α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) solid solutions with enhanced antibacterial (against methicillin-resistant Staphylococcus aureus) and antifungal (against Candida albicans) activities are reported. A plethora of ...

    • openAccess   Disclosing the Electronic Structure and Optical Properties of Ag4V2O7 crystals: Experimental and Theoretical Insights 

      Oliveira, Regiane; Gracia, Lourdes; Assis, Marcelo de; Siu Li, Maximo; Andres, Juan; Longo, Elson; Cavalcante, Laécio Santos Royal Society of Chemistry (2016)
      This work combines experimental and computational techniques to exploit the best of both methodologies and thus provide a tool for understanding the geometry, cluster coordination, electronic structure, and optical ...

    • closedAccess   Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals 

      Araújo, Vinícius Dantas; Tranquilin, R. L.; Motta, F. V.; Paskocimas, C. A.; Bernardi, Maria Inês B.; Cavalcante, Laécio Santos; Andres, Juan; Longo, Elson; Bomio, M. R. D. Elsevier (2014)
      For this study, lead molybdate (PbMoO4) microcrystals were prepared by the co-precipitation method and processed using a conventional hydrothermal method at 100 °C for 10 min with polyvinyl alcohol (PVA) as the capping ...

    • openAccess   Electronic structure and magnetic properties of FeWO4 nanocrystals synthesized by the microwave-hydrothermal method 

      Cavalcante, Laécio Santos; Morilla-Santos, C.; Lisboa Filho, Paulo N.; Beltran, Armando; Andres, Juan; Gracia, Lourdes; Longo, Elson; Almeida, M.A.P. Elsevier (2012)
      This communication reports that FeWO4 nanocrystals were successfully synthesized by the microwave-hydrothermal method at 443 K for 1 h. The structure and shape of these nanocrystals were characterized by X-ray diffraction, ...

    • openAccess   Facet-dependent photocatalytic and antibacterial properties of a-Ag2WO4 crystals: combining experimental data and theoretical insights 

      Alvarez Roca, Roman; Sczancoski, Júlio César; Nogueira, Içamira C.; Fabbro, Maria T.; Alves, H. C.; Gracia, Lourdes; Santos, Luís P. S.; De Sousa, C. P.; Andres, Juan; Luz Jr, Geraldo; Longo, Elson; Cavalcante, Laécio Santos Royal Society of Chemistry (2015-05)
      In this paper, we have combined the various experimental results and first-principles calculations with a new and interesting discussion to explain the photocatalytic and antibacterial activities of α-Ag2WO4 crystals, which ...

    • closedAccess   Hierarchical Assembly of CaMoO4 Nano-Octahedrons and Their Photoluminescence Properties 

      Longo, V. M.; Cavalcante, Laécio Santos; Paris, Elaine Cristina; Sczancoski, Júlio César; Pizani, Paulo Sergio; Siu Li, Maximo; Andres, Juan; Longo, Elson; Varela, José A. ACS (2011-03)
      Hierarchical assemblies of CaMoO4 (CM) nano-octahedrons were obtained by microwave-assisted hydrothermal synthesis at 120 °C for different times. These structures were structurally, morphologically and optically characterized ...

    • 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   Investigation of electronic structure, morphological features, optical, colorimetric, and supercapacitor electrode properties of CoWO4 crystals 

      Oliveira, Y.L.; Gouveia, Amanda; Costa, Joseita; Lopes, F.H.P.; Sczancoski, Júlio César; Longo, Elson; Luz Jr, Geraldo; Santos, Reginaldo; Cavalcante, Laécio Santos Elsevier B.V. (2022-01-12)
      Cobalt tungstate (CoWO4) crystals were synthesized by the co-precipitation (CP) and polymeric precursor (PP) methods with posterior heat treatment at 800 °C for 4 h. The electronic structure, morphological features, optical, ...

    • openAccess   Photoluminescence Properties of Nanocrystals 

      Cavalcante, Laécio Santos; Sczancoski, Júlio César; Varela, José A.; Longo, Elson; Andres, Juan; Rout, S. K. Hindawi Publishing Corporation (2012)
      Photoluminescence (PL) is an optical phenomenon exhibited by some semiconductor materials when excited by an electromagnetic radiation source. After the excitation and recombination processes, these kinds of materials are ...

    • 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 ...

    • openAccess   Structural and optical properties of ZnS/MgNb2O6 heterostructures 

      Santos, Luís P. S.; Cavalcante, Laécio Santos; Fabbro, Maria T.; Beltrán Mir, Héctor; Cordoncillo, Eloisa; Andres, Juan; Longo, Elson Elsevier (2015-03)
      In this letter, we report a simple and efficient synthetic procedure where the first step is a coprecipitation/calcination method used to obtain magnesium niobate MgNb2O6(MN) nanocrystals and in the second stage a microwave ...

    • openAccess   Structural investigation and sonophotocatalytic properties of the solid solutions Sr(Mo1−xWx)O4 crystals synthesized by the sonochemical method 

      de Sousa, P. B.; Nogueira, I. C.; Gusmão, G. O.M.; Gusmão, S. B.S.; Lopes, F.H.P.; Sousa, B. S.; Sczancoski, Júlio César; Gouveia, Amanda; Cavalcante, Laécio Santos Springer (2022-09-18)
      In this paper, the solid solutions of strontium molybdate-tungstate [Sr(Mo1−xWx)O4] crystals with (x = 0, 0.25, 0.50, 0.75, and 1) were synthesized by the sonochemical method. Their structure, morphology, optical, and ...

    • closedAccess   Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals 

      Bomio, M. R. D.; Cavalcante, Laécio Santos; Almeida, M.A.P.; Tranquilin, R. L.; Batista, N.C.; Pizani, Paulo Sergio; Siu Li, Maximo; Andres, Juan; Longo, Elson Elsevier (2013)
      Lead molybdate (PbMoO4) crystals were synthesized by the co-precipitation method at room temperature and then processed in a conventional hydrothermal (CH) system at low temperature (70 °C for different times). These ...