DE – Page 15 – TechConnect Briefs

Early Stages of Particle Formation by in-situ UV-Vis and HRS

Schürer B., Segets D., Peukert W., University of Erlangen-Nuremberg, DE

We present a new approach for the study of early states of particle formation that can be applied also for precipitation processes that occur on a millisecond timescale. A T-shaped micro-mixer is used to precipitate [...]

Synthesis of highly-doped silicon and germanium nanoparticles in a low-pressure plasma-reactor for thermoelectric and solar applications

Grimm H., Petermann N., Gupta A., Wiggers H., University of Duisburg-Essen, DE

Microwave-plasma induced thermal decomposition of gaseous precursors like germane (GeH4) and silane (SiH4) is used to synthesize semiconductor nanoparticles for thermoelectric and thermal applications. P and n-doping can be achieved by mixing silane and germane [...]

New ripening mechanism for silver and gold nanorods in aqueous solution

Segets D., Damm C., Yang G., Spiecker E., Peukert W., Friedrich-Alexander University, DE

In the last years an increasing number of publications addressed the relationship between particle shape and the electro-optical product properties. Especially anisotropic metal particles e.g. gold or silver were found to be promising candidates as [...]

Electrical Properties of Functionalized Silicon Nanoparticles

Hartner S., Gupta A., Wiggers H., University Duisburg-Essen, DE

Phosphorous-doped as well as undoped Si-NPs with a mean particle diameter of about 50 nm were synthesized in a microwave plasma. The natural oxide was removed by etching the particles with hydrofluoric acid. In order [...]

Investigation of the stabilisation mechanism of small ZnO quantum dots below 20 nm

Segets D., Marczak R., Schäfer S., Peukert W., Friedrich-Alexander-University of Erlangen-Nuremberg, DE

ZnO semiconductor quantum dots have attracted considerable attention during the past ten years due to their promising electro-optical properties. Besides fundamental research on the particle synthesis itself, especially the nanoparticles optimization regarding electronic devices or [...]

Ionic Liquids – Novel Tenside like Materials for size controlled Preparation of Nanoparticles and safe-to-handle Nanoparticle Dispersions

Beyersdorff T.F., Stiemke F.M., Willm A., Schubert T.J.S., Iolitec - Ionic Liquids Technologies GmbH, DE

The use of ionic liquids as green solvents for the synthesis of nanoparticles and their impact on the size control of the produced nanoparticles will be highlighted in this contribution as well as their influence [...]

Gas phase synthesis of silica nanoparticles in a hybrid microwave-plasma hot-wall reactor

Abdali A., Moritz B., Wiggers H., Schulz C., University of Duisburg-Essen, DE

A microwave plasma reactor was constructed for gas phase synthesis of silica nanoparticles from tetraethoxysilane and a subsequent hot-wall furnace was used to enable for different temperature/time profiles. This combination has enabled us to investigate [...]

Gas-phase synthesis of highly-specific nanoparticles on the pilot-plant scale

Huelser T., Schnurre S.M., Schulz C., Wiggers H., Institute of Energy and Environmental Technology, DE

Highly-specific nanoparticles from the gas-phase provide promising properties for a large variety of applications as the size dependence of their properties allows to tailor materials for specific applications. Industrial nanoparticle production, however, is covered by [...]

In-situ Surface Characterization of Nano- and Microparticles by Optical Second Harmonic Generation

Schürer B., Wunderlich S., Peschel U., Peukert W., University of Erlangen-Nuremberg, DE

We use optical Second Harmonic Generation (SHG) to probe different kinds of surface properties of dispersed particle systems in in-situ and in real time. Examples for applications are the direct study of molecular adsorption at [...]

Automatically Generated and Experimentally Validated System-Level Model of a Microelectromechanical RF Switch

Niessner M., Schrag G., Wachutka G., Iannacci J., Margesin B., Münich University of Technology, DE

In this work, we present a mixed-level model of an electrostatically actuated and viscously damped ohmic radio frequency (RF) microelectromechanical switch, which provides an accurate physical description of the device behavior and is suitable for [...]