Jong-Nam 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.

Nanomaterials in the size range of 3–50 nm have received increased attention in the last few decades because they exhibit physical properties that are intermediate to those of individual molecules and bulk materials. Similarly, ultrasmall nanoparticles (USNPs), with sizes in the 1–3 nm range, exhibit unique properties distinct from those of free molecules and larger-sized nanoparticles. These properties are greatly sensitive to both the composition and size of the particles, and thus, the abilit

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.

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

Recently, all-inorganic perovskite quantum dots (PeQDs), CsPbX 3 have become attractive because of their excellent optoelectronic properties and superior air/moisture stabilities compared with conventional organic–inorganic hybrid perovskites, and the application of CsPbX 3 PeQDs to light-emitting devices (LEDs) has also become competitive. To enable the use of CsPbX 3 PeQDs for thin-film-type perovskite quantum-dot LEDs (PeQLEDs), a paradox associated with the ligand property and surface passiv

Multifunctional nanocomposites (M-CLEAs) of enzymes and magnetic nanoparticles (M-NPs) were fabricated in hierarchically ordered, mesocellular, mesoporous silica (HMMS; see Figure) by a simple process involving the co-adsorption of enzyme molecules and magnetic nanoparticles into HMMS followed by glutaraldehyde (GA) treatment. These nanocomposites are magnetically separable and highly stable and active. In particular, M-CLEA–lipase shows no decrease of lipase activity at all in the presence of p

A simple method for the synthesis of a hierarchically self-assembled zinc oxide is presented, in which graphene oxide is used to assist in the assembly of the structure and improve the electrical conductivity of the ZnO. The self-assembled ZnO formed on graphene oxide exhibits a high specific capacity, while also demonstrating good rate performance and cycling stability due to the advantages of using both nanoparticles and a secondary structure.

InP quantum dots (QDs) are nontoxic emitters, which are considered an alternative to CdSe-based QDs. However, the limited choice and high cost of P precursors have a negative impact on their practical applicability. In this work, we report the large-scale synthesis of highly luminescent InP@ZnS QDs from an elemental P precursor (P 4 ), which was simply synthesized via the sublimation of red P powder. The size of the InP QDs was controlled by varying the reaction parameters such as the reaction t

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. As a service to our authors and readers, this journal provides supporting information supplied by the auth