Jongnam Park

Much progress has been made over the past ten years on the synthesis of monodisperse spherical nanocrystals. Mechanistic studies have shown that monodisperse nanocrystals are produced when the burst of nucleation that enables separation of the nucleation and growth processes is combined with the subsequent diffusion-controlled growth process through which the crystal size is determined. Several chemical methods have been used to synthesize uniform nanocrystals of metals, metal oxides, and metal

Accurate to size: Monodisperse magnetic iron oxide nanoparticles with a continuous size spectrum of 6–13 nm have been synthesized by a procedure similar to seed-mediated growth and characterized by transmission electron microscopy (see picture) and magnetic measurements. This method yields monodisperse nanoparticles directly without a size-selection process. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z461665_s.pdf or from t

We synthesized uniform-sized nanorods of transition metal phosphides from the thermal decomposition of continuously delivered metal-phosphine complexes using a syringe pump. MnP nanorods with dimensions of 8 nm x 16 nm and 6 nm x 22 nm sized were synthesized by the thermal decomposition of Mn-TOP complex, which was prepared from the reaction of Mn(2)(CO)(10) and tri-n-octylphosphine (TOP), using a syringe pump with constant injection rates of 10 and 20 mL/h, respectively. When Co-TOP complex, wh

Paßgenau: Monodisperse magnetische Eisenoxid-Nanopartikel mit einer kontinuierlichen Größenverteilung zwischen 6 und 13 nm wurden durch ein Verfahren erhalten, das dem Wachstum an einem Impfling nachempfunden ist. Die Produkte wurden durch Transmissionselektronenmikroskopie (siehe Bild) und Magnetismusmessungen charakterisiert. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2001/2005/z461665_s.pdf or from the author. Please note: The pub

Abstract In den vergangenen zehn Jahren wurden bei der Synthese monodisperser sphärischer Nanokristalle große Fortschritte erzielt. Mechanistische Studien haben gezeigt, dass monodisperse Nanokristalle entstehen, wenn sich an die schlagartige Keimbildung eine separate diffusionskontrollierte Wachstumsphase anschließt, die die Kristallitgröße festlegt. Eine Reihe chemischer Methoden wurde zur Synthese einheitlicher Metall‐, Metalloxid‐ und Metallchalkogenid‐Nanokristalle angewendet. Monodisperse

The rod of iron rules! Magnetic iron phosphide (Fe2P) nanorods (see picture) were synthesized through the thermal decomposition of a mixture of [Fe(CO)5] and trioctylphosphane that was continuously supplied by using a syringe pump. The size of the nanorods can be successfully controlled by subtle changes in the experimental conditions.

Uniform-sized MnO nanospheres and nanorods were fabricated by the thermal decomposition of Mn−surfactant complexes. The particle sizes of the nanospheres were varied from 5 to 40 nm by changing the surfactant. The shape of the particles could be controlled by varying the experimental conditions. The synthesized MnO nanorods have diameters ranging from 7 to 10 nm, and lengths ranging from 30 to 140 nm. Structural characterization using X-ray powder diffraction, X-ray absorption spectroscopy, and

An inverted architecture of quantum dot solar cells is demonstrated by introducing a novel ZnO method on top of the PbS CQD film. Improvements in device characteristics stem from constructive optical interference from the ZnO layer that enhances absorption in the PbS CQD layer. Outstanding diode characteristics arising from a superior PbS/ZnO junction provide a further electronic advantage.

Nano-floating gate memory (NFGM) devices are transistor-type memory devices that use nanostructured materials as charge trap sites. They have recently attracted a great deal of attention due to their excellent performance, capability for multilevel programming, and suitability as platforms for integrated circuits. Herein, novel NFGM devices have been fabricated using semiconducting cobalt ferrite (CoFe2O4) nanoparticles (NPs) as charge trap sites and pentacene as a p-type semiconductor. Monodisp

Eiserne Stäbchen: Magnetische Eisenphosphid(Fe2P)-Nanostäbe (siehe Bild) wurden durch thermische Zersetzung einer kontinuierlich zugeführten [Fe(CO)5]/Trioctylphosphan-Mischung erhalten. Die Größe der Nanostäbe kann durch geringfügige Änderungen der experimentellen Bedingungen gezielt variiert werden.