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National Repository of Grey Literature

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Effect Of Al2O3 Barrier On The Field Emission Properties Of Tungsten Single-Tip Field Emitters Burda, Daniel ; Knápek, Alexandr This research aims to obtain a more in-depth understanding of the field emission properties of tungsten single-tip field emitters (STFEs) coated with a several tens of nanometer thin barrier of Al2O3. The introduction of an additional barrier into the metal-vacuum interface system of the emitter can be beneficial to improve its performance. The tungsten emitters were prepared using a two-step electrochemical drop-off etching technique. Thin oxide barrier coatings were prepared by using low-temperature atomic layer deposition (ALD), a chemical vapor deposition technique. Field emission was studied in an internally developed field emission microscope (FEM) working in UHV vacuum (< 1·10−7 Pa), and the experimental field emission data were analyzed by the so-called Murphy-Good plotsThe value of the local work function of the grown oxide layer were investigated using Ultra-violet photoelectron spectroscopy (UPS). Detailed record

Field Electron Emission Performance And Orthodoxy Test Of Tungsten Emitters With And Without Thin Tungsten Trioxide Barrier Burda, Daniel This initial study aims to explore the topic of thin barrier layers for single tip cold field emitters. The experiment and measurements have been conducted in ultra-high vacuum field electron microscope. Additionally, micrographs of the emitter were obtained using scanning electron microscope. The performance of the emitter was evaluated using orthodoxy test and Murphy-Good plots, which can give more complete picture of emitter changes during field emission. Detailed record

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