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Techniques for Optimizing Nanotips Derived from Frozen Taylor Cones

United States Patent Application

*** PATENT GRANTED ***
20170076901
9,837,239
A1
View the Complete Application at the US Patent & Trademark Office
Optimization techniques are disclosed for producing sharp and stable tips/nanotips relying on liquid Taylor cones created from electrically conductive materials with high melting points. A wire substrate of such a material with a preform end in the shape of a regular or concave cone, is first melted with a focused laser beam. Under the influence of a high positive potential, a Taylor cone in a liquid/molten state is formed at that end. The cone is then quenched upon cessation of the laser power, thus freezing the Taylor cone. The tip of the frozen Taylor cone is reheated by the laser to allow its precise localized melting and shaping. Tips thus obtained yield desirable end-forms suitable as electron field emission sources for a variety of applications. In-situ regeneration of the tip is readily accomplished. These tips can also be employed as regenerable bright ion sources using field ionization/desorption of introduced chemical species.
Hirsch, Gregory (Pacifica, CA)
15/ 361,911
November 28, 2016
GOVERNMENT LICENSE RIGHTS [0002] This invention was made with government support under Grant No. DE-SC0011345 awarded by the Department of Energy on Feb. 18, 2014.