7 documents found, page 1 of 1
Interplay of magnetic properties and doping in epitaxial films of h-REFeO3 mult...
Baghizadeh, Ali; Vaghefi, Pegah Mirzadeh; Huang, Xing; Borme, Jerome; Almeida, B. G.; Salak, Andrei N.; Willinger, Marc-Georg; Amaral, Vitor B.Multiferroic materials demonstrating coexistence of magnetic and ferroelectric orders are promising candidates for magnetoelectric devices. While understanding the underlying mechanism of interplaying of ferroic properties is important, tailoring their properties to make them potential candidates for magnetoelectric devices is challenging. Here, the antiferromagnetic Neel ordering temperature above 200 K is rea...
Interplay of magnetic properties and doping in epitaxial films of h-REFeO3 mult...
Baghizadeh, Ali; Vaghefi, Pegah Mirzadeh; Huang, Xing; Borme, Jerome; Almeida, Bernardo; Salak, Andrei N.; Willinger, Marc-Georg; Amaral, Vitor B.Multiferroic materials demonstrating coexistence of magnetic and ferroelectric orders are promising candidates for magnetoelectric devices. While understanding the underlying mechanism of interplaying of ferroic properties is important, tailoring their properties to make them potential candidates for magnetoelectric devices is challenging. Here, the antiferromagnetic Neel ordering temperature above 200 K is rea...
Nanodomains Coupled to Ferroelectric Domains Induced by Lattice Distortion in S...
Baghizadeh, A.; Vieira, Joaquim M.; Goncalves, Joao N.; Willinger, Marc-Georg; Ferro, Marta C.; Amaral, Vitor S.Self-doped h-LuMnxO3 +/-delta multiferroic ceramics with 0.92 <= x <= 1.12 were studied for the dependence of: magnetic properties on x. Interlocking of lattice distortion at the nanoscale with ferroelectric (FE) domains in bulk RMnO3 materials is, mostly unknown. Here we report occurrence of nanodomains in transmission electron microscopy (TEM) images with the presence of antiphase boundaries/ferroelectric dom...
Gold-dotted hydroxyapatite nanoparticles as multifunctional platforms for medic...
dos Santos, Catarina Ferreira; Gomes, Pedro Sousa; Almeida, Maria Margarida; Willinger, Marc-Georg; Franke, Ralf-Peter; Fernandes, Maria HelenaA novel synthetic approach for coupling metallic gold nanoparticles (AuNPs) to the facets of hydroxyapatite crystalline nanoparticles (HapNPs) without an additional reducing agent was developed. Hexagonal prism-shaped hydroxyapatite nanoparticles (HapNPs) were first precipitated by a hydrothermal route assisted by citric acid, which left behind carboxylate species adsorbed on the HapNP facets. HapNP were then u...
Microwave-assisted coating of carbon nanostructures with titanium dioxide for t...
Russo, Patricia A.; Lima, Sergio; Rebuttini, Valentina; Pillinger, Martyn; Willinger, Marc-Georg; Pinna, Nicola; Valente, Anabela A.Titanium dioxide was selectively grown on reduced graphene oxide (TiO2/RGO) and carbon black (TiO2/CB) by a microwave-assisted synthesis in benzyl alcohol to produce nanocomposite catalysts (consisting of 8-9 nm anatase nanoparticles dispersed on the carbon surface) with interesting properties for the production of furfural from renewable carbohydrate biomass. The materials efficiently catalyze the aqueous-phas...
Tin Dioxide-Carbon Heterostructures Applied to Gas Sensing: Structure-Dependent...
Marichy, Catherine; Russo, Patricia A.; Latino, Mariangela; Tessonnier, Jean-Philippe; Willinger, Marc-Georg; Donato, Nicola; Neri, GiovanniCarbon materials such as carbon nanotubes (CNTs), graphene, and reduced graphene oxide (RGO) exhibit unique electrical properties, which are also influenced by the surrounding atmosphere. They are therefore promising sensing materials. Despite the existence of studies reporting the gas-sensing properties of metal oxide (MOx) coated nanostructured carbon, an incomplete understanding of their sensing mechanism re...
Galvanic Replacement Reactions in Metal Oxide Nanocrystals
Oh, Myoung Hwan; Yu, Taekyung; Yu, Seung-Ho; Lim, Byungkwon; Ko, Kyung-Tae; Willinger, Marc-Georg; Seo, Dong-Hwa; Kim, Byung Hyo; Cho, Min GeeGalvanic replacement reactions provide a simple and versatile route for producing hollow nanostructures with controllable pore structures and compositions. However, these reactions have previously been limited to the chemical transformation of metallic nanostructures. We demonstrated galvanic replacement reactions in metal oxide nanocrystats as well. When manganese oxide (Mn3O4) nanocrystals were reacted with i...