Browsing by Author "e8e6f59a-4f44-43dd-8deb-87de7e672f68"
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A 3D platform for the morphology modulation of materials: first principles calculations on the thermodynamic stability and surface structure of metal oxides: Co3O4, α-Fe2O3, and In2O3
Ferrer, M. M.; Gouveia, Amanda; Gracia, Lourdes; Longo, Elson; Andres, Juan IOP Publishing (2016)Essentially, the exposed crystal planes of a given material, which primarily determine their morphology, tremendously affect its behavior. First principle calculations, based on the Wulff construction model and broken ... -
A Chemical-Pressure-Induced Phase Transition Controlled by Lone Electron Pair Activity
Gomes, Eduardo O.; Gouveia, Amanda; Gracia, Lourdes; Lobato, Alvaro; recio, jose manuel; Andres, Juan American Chemical Society (2022-10-17)The chemical pressure approach offers a new paradigm for property control in functional materials. In this work, we disclose a correlation between the β → α pressure-induced phase transition in SnMoO4 and the substitution ... -
Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects
Assis, Marcelo de; Groppo Filho, Francisco C.; Pimentel, Dayene S.; Gouveia, Amanda; Tassia F. D., Castro; Fukushima, Hirla C. S.; Foggi, Camila Cristina; da Costa, João P. C.; Borra, Ricardo Carneiro; Andres, Juan; Longo, Elson Wiley (2020-04-23)Periodic structures induced by electron irradiation are a unique phenomenon when electron beams irradiate on the surface of some materials. These periodic structures have potential for technological applications. However, ... -
Ag2WO4 as a multifunctional material: Fundamentals and progress of an extraordinarily versatile semiconductor
Gouveia, Amanda; Alvarez Roca, Roman; Guerra Macedo, Nadia; Cavalcante, Laécio Santos; Longo, Elson; San-Miguel, Miguel A.; Altomare, Angela; DA SILVA, GILMAR SILVÉRIO; Andres, Juan Elsevier (2022-11-18)Silver tungstate (Ag2WO4) based materials are intensively studied because of their unique chemical and physical properties. Ag2WO4 polymorphs present discrete and intrinsically complex architectures due to a multifaceted ... -
alpha-Ag2-2xZnxWO4 (0 <= x <= 0.25) Solid Solutions: Structure, Morphology, and Optical Properties
Pereira, Paula; Santos, Clayane C.; Gouveia, Amanda; Ferrer, Mateus M.; Pinatti, Ivo M; Botelho, Gleice; Sambrano, Julio; Rosa, Ieda; Andres, Juan; Longo, Elson American Chemical Society (2017-06)A theoretical study was elaborated to support the experimental results of the Zn-doped α-Ag2WO4. Theses α-Ag2–2xZnxWO4 (0 ≤ x ≤ 0.25) solid solutions were obtained by coprecipitation method. X-ray diffraction data indicated ... -
Analysis of the Pb0.30CaxSryTiO3 ternary system: The effect of Ca2+ and Sr2+ cations on the electrical properties of PbTiO3
Gouveia, Amanda; Ribeiro , Lara Kelly; Assis, Marcelo de; Longo, Elson; Andres, Juan; pontes, fenelon Sao Paulo State University. Institute of Chemistry (2022-08-17)Powder and thin films of the Pb0.30Ca0.10Sr0.60TiO3 (PCST 30/10/60) and Pb0.30Ca0.60Sr0.10TiO3 (PCST 30/60/10) ternary system were synthetized by the polymeric precursor method and the thin films deposited on the Si/SiO2/Ti/Pt ... -
Back to the basics: probing the role of surfaces in the experimentally observed morphological evolution of ZnO
Gouveia, Amanda; Lemos, Samantha; Leite, Edson R.; Longo, Elson; Andres, Juan MDPI (2023-03-08)Although the physics and chemistry of materials are driven by exposed surfaces in the morphology, they are fleeting, making them inherently challenging to study experimentally. The rational design of their morphology and ... -
Connecting morphology and photoluminescence emissions in β-Ag2MoO4 microcrystals
Teodoro , Vinícius; Gouveia, Amanda; Machado, Thales Rafael; Barrios Trench, Aline; jacomaci, natalia; Assis, Marcelo de; Marques, Gilmar Eugenio; Daldin Teodoro, Marcio; San-Miguel, Miguel A.; Andres, Juan; Bettini, Jefferson; Longo, Elson Elsevier (2021-10-23)This work elucidates the morphology-photoluminescence (PL) emission relationships, based on experimental and calculated results, on β-Ag2MoO4 samples synthesized by microwave-assisted hydrothermal method. It was shown that ... -
Connecting structural, optical, and electronic properties and photocatalytic activity of Ag3PO4:Mo complemented by DFT calculations
Barrios Trench, Aline; Machado, Thales Rafael; Gouveia, Amanda; Assis, Marcelo de; da Trindade, Letícia; Santos, Clayane; Perrin, Andre; Perrin, Christiane; Oliva, Mónica; Andres, Juan; Longo, Elson Elsevier (2018-12-15)The present join experimental and theoretical work provides in-depth understanding on the relationship among structural, optical, and electronic properties and photocatalytic activity of Ag3PO4:Mo microcrystals. We prepared ... -
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 ... -
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 ... -
Effects of surface stability on the morphological transformation of metals and metal oxides as investigated by first-principles calculations
Andres, Juan; Gracia, Lourdes; Gouveia, Amanda; Meneghetti Ferrer, Mateus; Longo, Elson IOP Publishing (2015)Morphology is a key property of materials. Owing to their precise structure and morphology, crystals and nanocrystals provide excellent model systems for joint experimental and theoretical investigations into surface-related ... -
Evidence for the formation of metallic In after laser irradiation of InP
Cabral, Luís; Andres, Juan; Machado, Thales Rafael; Picinin, Adalberto; Rino, José Pedro; Lopez-Richard, Victor; Longo, Elson; Gouveia, Amanda; Marques, Gilmar Eugenio; da Silva, Edison; San-Miguel, Miguel A. AIP Publishing (2019-07-12)Structural and electronic changes induced by laser irradiation are currently of interest owing to the possibility to tune the mechanical, optical, and transport properties of the irradiated materials. In this work, we ... -
Experimental and Theoretical Correlation of Modulated Architectures of β-Ag2MoO4 Microcrystals: Effect of Different Synthesis Routes on the Morphology, Optical, Colorimetric, and Photocatalytic Properties
Lopes, F.H.P.; Noleto, L. F. G.; Vieira, V. E. M.; de Sousa, P. B.; Jucá, A. C. S.; Oliveira, Y. L.; Costa, K. R. B. S.; Almeida, M. A. P.; Gouveia, Amanda; Cavalcante, L. S. Springer (2022-11-27)In this paper, the effect of different synthesis methods, such as controlled precipitation (CP), sonochemical, hot solution ion injection with fast cooling, and conventional hydrothermal in obtaining beta-disilver molybdate ... -
Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6
Pinatti, Ivo M; Gouveia, Amanda; Doñate-Buendía, Carlos; Mínguez-Vega, Gladys; Longo, Elson Nature Research (2020)Controlling the structural organization and crystallinity of functional oxides is key to enhancing their performance in technological applications. In this work, we report a strong enhancement of the structural organization ... -
Formation of Ag Nanoparticles on β‑Ag2WO4 through Electron Beam Irradiation: A Synergetic Computational and Experimental Study
Alvarez Roca, Roman; Gouveia, Amanda; Lemos, Pablo S.; Gracia, Lourdes; Andres, Juan; Longo, Elson American Chemical Society (2016)In the present work, a combined theoretical and experimental study was performed on the structure, optical properties, and growth of Ag nanoparticles in metastable β- Ag2WO4 microcrystals. This material was synthesized ... -
Formation of Ag nanoparticles under electron beam irradiation: Atomistic origins from first-principles calculations
Andres, Juan; Gouveia, Amanda; Gracia, Lourdes; Longo, Elson; Faccin, Giovani M.; da Silva, Edison; Henrique Pereira, Douglas; San-Miguel, Miguel A. Wiley (2017-12)The formation of Ag nanoparticles is currently a topic subject to a great deal of research because they are excellent materials with many technological applications. Recently, the formation of Ag nanoparticles on α‐Ag2WO4 ... -
In situ Formation of Metal Nanoparticles through Electron Beam Irradiation: Modeling Real Materials from First-Principles Calculations
Andres, Juan; Longo, Elson; Gouveia, Amanda; Costa, João Paulo C.; Gracia, Lourdes; Oliveira, M. C. OMICS International (2018-06)Advances in electron-matter studies, based on the irradiation of the electron beam in the transmission electron microscopy or field emission-scanning electron microscope on materials represents a preferred external physical ... -
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, ... -
Laser-induced formation of bismuth nanoparticles
Assis, Marcelo de; Cordoncillo, Eloisa; Torres-Mendieta, Rafael; Beltrán Mir, Héctor; Mínguez-Vega, Gladys; Gouveia, Amanda; Leite, Edson; Andres, Juan; Longo, Elson Royal Society of Chemistry (2018)In the current communication, the synthesis of metallic Bi nanoparticles with coexisting crystallographic structures (rhombohedral, monoclinic, and cubic) obtained via direct femtosecond laser irradiation of NaBiO3 is ...