nanocrystal – TechConnect Briefs

Laser precipitation of Eu and Yb codoped CaF2 nanocrystals on the surface of glass and emission characteristics

Kim D.S., Bae C-H, Lim K-S, Chungbuk National University, KR

We precipitated spatially selective Eu/Yb doped CaF2 nanocrystals on the surface of glass by CO2 laser irradiation. Because of low phonon energy of CaF2, we observed several times enhancements in down-shift emission under 365 nm [...]

Versatile Polymer-Derived Nanocrystal Microreactors towards Uniform Fluorescent Photonic Crystal Supraballs

Zhang J., Ling L.T, Tian Y., Wang C.F., Chen S., Zhang J., Nanjing Tech University, CN

In this work, versatile polymer-derived NC microreactors were designed for the first time towards the construction of fluorescence colloidal photonic crystals. The carboxyl-terminated polystyrene colloids were synthesized by seeded copolymerization of AA and HEMA with [...]

Synthesis of Ultra Small Biocompatible Magnetic Nanocomposites by Seeded Emulsion Polymerization

Kloust H., Pöselt E., Kappen S., Schmidtke C., Kornowski A., Pauer W., Moritz H.-U., Weller H., University of Hamburg, DE

We present the production of PEGylated particles in the lower nanometer range by a new seeded emulsion polymerization technique under micro-emulsion conditions, avoiding any treatment with high shear forces or ultrasonication. Hereby, the hydrophobic shells [...]

Silicon and Germanium Nanocrystal Thin Films Prepared Using Innovative Nonaqueous Electrophoretic Deposition

Haag M., Sipe J., Universal Nanotech Corporation, US

As cost effective synthetic routes for producing large quantities of high purity size-specific nanoparticles become fully realized, the next challenge lies in fabricating devices that utilize the unique size-dependent optoelectronic properties inherent in quantum dot [...]

Synthesis of Cobalt-based Nanoparticles in Silicon Dioxide for Nonvolatile Memory Applications

Yoon J-H, Kangwon National University, KR

In this study, we report the direct growth of cobalt (Co) silicide nanocrystals (NCs) by thermally annealing of a simple sandwich structure consisting of an ultrathin Co layer sandwiched between two silicon-rich oxide (SiOx) layers, [...]

Intracellular Inclusions and Nanocrystals of magnetotactic coccus isolated from estuary in Colombia

Grisales S., Morillo V., Marquez M., Morales A., Salazar A., Universidad Nacional de Colombia Sede Medellín, CO

Magnetotactic bacteria containing intracellular membrane-bound nanocrystals of magnetite or greigite (Bazylinski, et al. 2004; Flies, et al. 2005). The bacteria may also have intracellular inclusions (Keim, et al. 2005). Magnetosome formation in magnetotactic bacteria provides [...]

Organic Solvent Dispersed TiO2 Nanocrystal Sol: Synthesis and Characterization

Rao Y.Q., Antalek B., Minter J., Mourey T., Blanton T., Slater G., Slater L., Slater G., Slater L., Fornalik J., Eastman Kodak Company, US

Anatase TiO2 nanocrystals with a mean diameter of about 10 nm were successfully synthesized through a non-aqueous sol gel route without the use of air free equipments. The nanocrystals were well dispersed in organic solvents [...]

Effect of Reaction Temperature on the Structural and Optical Properties of Zno Nanocrystals

Parra-Palomino A., Sotomayor C., Perales-Perez O., Singhal R., Voyles P., Tomar M.S., University of Puerto Rico, PR

The present research addressed the size-controlled synthesis of ZnO nanocrystals at different temperatures. In order to study systematically the dependence of crystal size with synthesis conditions in ethanol, stable suspensions of these nanocrystals were produced [...]

Metal-Semiconductor-Metal Ultraviolet Detectors Utilizing Ge Nanocrystals Active Medium on Si Substrate

Lo S.Y., Wu P.J., Yeh R.H, Hong J.W., National Central University, TW

Since the observation of photoluminescence from porous Si, nanocrystalline Si and Ge have extensively been studied because it would open a possibility for indirect-gap semiconductors for optoelectronic applications. Nayfeh et al. reported ultraviolet (UV) detectors [...]

DNA/Cellulose hybrid nanomaterials

Mangalam A., Simonsen J., Benight A.S., Oregon State University, US

One potential advantage of nanotechnology is the ability to engineer bottom-up hierarchical assembly of nanoparticles into functional macroscale materials and devices. The most promising mechanism for accomplishing this is self-assembly. In this project, an advanced [...]