Florian Dassinger

In situ synthesis of metallic nanowire arrays for ionization gauge electron sources

An in situ synthesis process for nanowire arrays was used to fabricate a customized field emitter array for use as a nonthermal electron source in an ionization gauge. The wire arrays fabricated with this process had a density of 1.6 × 106 cm−2 using optimized deposition of the wires in template foils on predefined electrodes. The diameter of the wires varied from 100 to 400 nm and their length ranged from 8 to 100 μm. This method can enclose with nanowires a wide area of predefined electrodes, and is possible for areas larger than 3 cm2. Further, the cylindrical shape of the nanowires was modified into a conical geometry to achieve improved thermomechanical stability.

Monolithic SU-8 based hollow waveguide with integrated electro thermally tunable iris filter for W-band applications

This paper reports the design and fabrication of a new generation of micromechanically fabricated hollow waveguides for the W-band (75-110 GHz). It is based on UV high aspect ratio lithography for 1.27 mm SU-8 thick films on PCB substrates. The epoxy based negative resist provides the means to monolithically integrate electro thermal actuators. This enables the realization of tunable waveguide components like the described iris filter design.

In-place synthesis of metallic nanowire arrays for the use in an ionization vacuum gauge

An in-place synthesis process for nanowires is used to fabricate a customized field emitter array for the use as a non-thermal electron source in an ionization gauge. The fabrication was further expanded to metallic nanocones with a density of 1.6 × 106 cm-2 using optimized deposition of the cones on predefined electrodes. This method can make the wide area of the predefined electrodes enclosed with nanowires with less standard deviation in their height.

Patterned arrays of capped platinum nanowires with quasi-elastic mechanical response to lateral force

In this Letter, we describe the electrodeposition of capped, micro-sized Pt nanowire arrays in ion-track etched polymer templates and measure their collective mechanical response to an external force. By using an aperture mask during the irradiation process, it was possible to restrict the creation of pores in the templates to defined areas, allowing the fabrication of small nanowire arrays in different geometries and sizes. The simultaneous and highly reliable formation of many nanowire arrays was achieved using a pulsed electrodeposition technique. After deposition, the polymer matrix was removed using a gentle, dry oxygen plasma treatment, resulting in an excellent preservation of the array nanostructure as confirmed by scanning electron microscopy. A force measuring station was set up to perform mechanical characterization series on free-standing arrays. The nanowire arrays show a high robustness and respond sensitively to the applied force, making them attractive as spring elements in miniaturized inertial sensors, for example.