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Title: Techniques for optimizing nanotips derived from frozen taylor cones

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.
Inventors:
Issue Date:
OSTI Identifier:
1411394
Assignee:
Hirsch, Gregory CHO
Patent Number(s):
9,837,239
Application Number:
15/361,911
Contract Number:
SC0011345
Resource Relation:
Patent File Date: 2016 Nov 28
Research Org:
Hirsch Scientific, Pacifica, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE