Taekyung Yu

Many facets: A simple synthetic route, which is based on reduction in aqueous solution, results in Pt concave nanocubes (see picture) enclosed by high-index facets such as {510}, {720}, and {830}. The nanocrystals exhibit electrocatalytic activity (per unit surface area) that is 3.5 times higher than the commercial Pt/C catalyst in the oxygen reduction reaction. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not

(Figure Presented) Spawning nanostructures: Uniform-sized ceria nanocrystals with sphere, wire, and tadpole shapes were synthesized from the nonhydrolytic sol-gel reaction of cerium(III) nitrate and diphenyl ether in the presence of appropriate surfactants. The picture shows a TEM image of a batch of tadpole-shaped nanowires (bottom left) and low-magnification and high-resolution TEM images of a single tadpole-shaped nanowire (right and top left, respectively). © 2005 Wiley-VCH Verlag GmbH &

Pt/CeO2 hybrid nanostructures consisting of sub-3 nm Pt nanocrystals supported on octahedral CeO2 nanocrystals can be synthesized by in situ reduction of a Pt precursor in the presence of CeO2 octahedra. Pt/CeO2 hybrid nanostructures exhibit higher resistance to poisoning by the reaction product during the catalytic reduction of p-nitrophenol into p-aminophenol by NaBH4 as compared to the unsupported Pt nanocrystals.

The evolution of sheet morphology for single-crystal ceria nanosheets with a thickness of about 2.2 nm and lateral dimensions up to 4 μm (see picture), involves two-dimensional self-organization of the initially formed ceria nanocrystals, followed by recrystallization. Ceria nanosheets exhibit an unusually large optical band gap energy due to the quantum size effect associated with their extremely small thickness.

We report a novel and facile method for the synthesis of manganese oxide (Mn3O4) nanocrystals with various sizes and shapes. Mn3O4 nanocrystals were synthesized via a reaction of manganese(II) acetate with water in xylene in the presence of surfactants at the temperature of as low as 90 degrees C in air atmosphere. Structural characterizations revealed that the synthesized nanocrystals were tetragonal Mn3O4 structure and that they were highly crystalline in spite of the low reaction temperature.

Form und Funktion: Eine einfache Synthese führt über eine Reduktion in wässriger Lösung zu konkaven Pt-Nanowürfeln (siehe Bild) mit hochindizierten Flächen wie {510}, {720} und {830}. Die elektrokatalytische Aktivität der Nanokristalle (bezogen auf die Oberfläche) in der Sauerstoffreduktion ist 3.5-mal höher als die eines Pt/C-Katalysators. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typese

We report on the synthesis of samaria nanowires and nanoplates with a thickness of 1.1 nm. The cross-section of the nanowires is a rectangular shape with dimensions of 1.1 nm x 2.2 nm, which corresponded to the size of two unit cells of samaria. Under optimized conditions, we were able to synthesize as much as 10 g of the nanowires.

Sei kein Frosch! Nanokristalle aus Cerdioxid mit einheitlicher Größe und sphärischer, drahtförmiger oder Kaulquappen-förmiger Gestalt wurden aus einer nichthydrolytischen Sol-Gel-Reaktion von Cer(III)-nitrat und Diphenylether in Gegenwart geeigneter Tenside erhalten. Im Bild sind TEM-Aufnahmen von Kaulquappen-förmigen Nanodrähten gezeigt: mehrere Drähte unten links, ein einzelner Draht niedrig (rechts) und hochaufgelöst (oben links). Supporting information for this article is available on the WW

Die Schichtmorphologie von etwa 2.2 nm dicken und bis zu 4 μm breiten einkristallinen Ceroxidnanoblättern (siehe Bild) entsteht durch zweidimensionale Selbstorganisation anfänglich gebildeter CeO2-Nanokristalle und nachfolgende Umkristallisation. Die geringe Dicke der Nanoblätter führt zu Größenquantelungseffekten und zu einer außergewöhnlich großen optischen Bandlücke. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed,

Highly concentrated Ag nanoparticles (above 20 g L⁻¹) synthesized by the reaction AgNO₃ with BPEI exhibited long-term stability over more than 40 days.

To obtain high catalytic properties, finely modulating the electronic structure and active sites of catalysts is important. Herein, we report the design and economical synthesis of Pd@Pt core-shell nanoparticles for high productivity in the direct synthesis of hydrogen peroxide. Pd@Pt core-shell nanoparticles with a partially covered Pt shell on a Pd cube were synthesized using a simple direct seed-mediated growth method. The synthesized Pd@Pt core-shell nanoparticles were composed of high index

We report a visual detection of Cr(VI) ions using silver-coated gold nanorods (AuNR@Ag) as sensing probes. Au NRs were prepared by a seed-mediated growth process and AuNR@Ag nanostructures were synthesized by growing Ag nanoshells on Au NRs. Successful coating of Ag nanoshells on the surface of Au NRs was demonstrated with TEM, EDS, and UV-vis spectrometer. By increasing the overall amount of the deposited Ag on Au NRs, the localized surface plasmon resonance (LSPR) band was significantly blue-s

The catalytic properties of materials are determined by their electronic structures, which are based on the arrangement of atoms. Using precise calculations, synthesis, analysis, and catalytic activity studies, we demonstrate that changing the lattice constant of a material can modify its electronic structure and therefore its catalytic activity. Pd/Au core/shell nanocubes with a thin Au shell thickness of 1 nm exhibit high H₂O₂ production rates due to their improved oxygen

We describe a simple method for synthesizing mesoporous silica-coated luminescent europium-doped gadolinium vanadate (GdVO4:Eu3+@mSiO2) nanoparticles. Their biomedical applications as a potential imaging nanoprobe for both fluorescence imaging and magnetic resonance imaging (MRI) and as a simultaneous anti-cancer drug delivery vehicle are also discussed. Eu3+ doped GdVO4 nanoparticles exhibit strong red photoluminescence and the Gd3+ in GdVO4 can be used as a T1 contrast agent for MRI. T1-weight