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We have optimized the fabrication of sharp copper nanocones (Cu-NCs) for flat patch-structured field emission (FE) cathodes. Polycarbonate (PC) foils were irradiated through a shadow mask with swift Xe or U ions. The ion tracks were asymmetrically etched in a mixture of NaOH and methanol. These membranes were metallized, fixed on an Al plate, and electrochemically filled with Cu through the small...
We have fabricated patch-structured nanocone (NC) cathodes by using asymmetrically etched ion-track membranes which were metallized and fixed on flat holders. The conical channels of these templates were filled by potentiostatic copper deposition resulting in freestanding Cu-NC of ∼ 28 μm length, ∼ 3 μm base, and 160–240 nm tip diameter. Fairly homogeneous and well-aligned field emission from all...
In this work we combine ion track techniques to construct self-aligned vertical structures with nanometer dimensions. The main idea is to use multilayer targets and apply various etching techniques to create openings along the ion path. By irradiating such a multilayered sample including a tetrahedral amorphous carbon (ta-C) layer and a polymer film on top of the stack with swift heavy ions, the track...
Copper nanocones (Cu-NCs) of about 30 µm length and of ∼2.4 µm in base and ∼380 nm in tip diameter were grown in polymer ion-track membranes. Field emission (FE) properties of two types of cathodes with randomly distributed Cu-NCs were investigated. The unstructured cathode with high number density (107 cm−2) and excellent mechanical stability of Cu-NCs yielded stable currents up to 100 µA at electric...
Freestanding copper nanocones (Cu-NC) are fabricated by electrodeposition in etched ion-track membranes for field emission investigations. Different deposition conditions of the Cu-NC were studied in order to get mechanically stable cones with good electrical contact to the substrate. Electrodeposition at −40 mV lead to a slow growth rate, resulting in uniform and mechanically stabile Cu-NC of about...
We report on the investigation of field emission (FE) properties of gold nanowire patch arrays as well as on the observation of morphology changes of the nanowires in selected patches due to FE operation. The actual current limits in the μA range are caused by heating and successive destruction of nanowires. SEM images reveal geometrical constrictions in the contact region to the substrate. Appropriate...
Metallic nanostructures with controllable dimension and high aspect ratio provide an interesting alternative to carbon nanotubes for triode applications which require highly efficient and homogeneous field emission cathodes. Noble metal nanowires (NW) were electrochemically synthesized into the randomly distributed cylindrical pores of polycarbonate templates fabricated by GeV-ion irradiation, selective...
Field emission (FE) properties of randomly distributed free-standing Au nanowires (NW) were measured using thin metallic cathodes of about 50 mm2 in size with about 107 NW/cm2. The NW of diameter 120-260 nm and length 5-15 mum were electrochemically grown in cylindrical pores of etched ion-track polycarbonate membranes. The FE properties of the Au NW were investigated by local FESM measurements with...
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