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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

Other works cited in this record:

Electrohydrodynamic spraying to produce ultrafine particles
patent, April 1981

Method and apparatus for making submicrom powders
patent, August 1988

Point projection photoelectron microscope with hollow needle
patent, May 1989

Production and manipulation of charged particles
patent, October 1992

Electron emission element with schottky junction
patent, September 1996

Apparatus and method for controlled particle beam manufacturing
patent, March 2009

Liquid metal ion thruster array
patent, November 2010

Self-regenerating nanotips for low-power electric propulsion (EP) cathodes
patent, December 2011

Bright and durable field emission source derived from refractory taylor cones
patent, December 2016

Method and apparatus for mass spectrometry analysis of common analyte solutions
patent-application, March 2003

Low-temperature grown high quality ultra-thin CoTiO3 gate dielectrics
patent-application, June 2003

X-ray microscopic inspection apparatus
patent-application, May 2005

X-Ray Emitter, Liquid-Metal Anode For An X-Ray Source and Method For Operating A Magnetohydrodynamic Pump For The Same
patent-application, November 2007

Read/Write Tip, Head and Device, and Use Thereof, and Method for Manufacturing Same
patent-application, October 2008

Self-Regenerating Nanotips For Low-Power Electric Propulsion (EP) Cathodes
patent-application, June 2009

Ion Sources, Systems And Methods
patent-application, July 2009

Ionic Emission Micronic Source
patent-application, July 2010

Stable field-induced electron emission from a solidified liquid metal ion source
journal, January 1998
  • Chen, L. W.; Wang, Y. L.
  • Applied Physics Letters, Vol. 72, Issue 3, p. 389-391
  • DOI: 10.1063/1.120745

Liquid-metal-jet anode electron-impact x-ray source
journal, August 2003
  • Hemberg, O.; Otendal, M.; Hertz, H. M.
  • Applied Physics Letters, Vol. 83, Issue 7, p. 1483-1485
  • DOI: 10.1063/1.1602157

Formation of a nano-emitter for electron field emission on a liquid metal ion source tip after solidification of the alloy
journal, December 2002

Electron emission characteristics of solidified gold alloy liquid metal ion sources
journal, May 1999

A single-atom sharp iridium tip as an emitter of gas field ion sources
journal, July 2009

Preparation and Characterization of Single-Atom Tips
journal, December 2004
  • Kuo, Hong-Shi; Hwang, Ing-Shouh; Fu, Tsu-Yi
  • Nano Letters, Vol. 4, Issue 12, p. 2379-2382
  • DOI: 10.1021/nl048569b

Vacuum electrospray of volatile liquids assisted by infrared laser irradiation
journal, February 2012
  • Ninomiya, Satoshi; Chen, Lee Chuin; Suzuki, Hiroaki
  • Rapid Communications in Mass Spectrometry, Vol. 26, Issue 7, p. 863-869
  • DOI: 10.1002/rcm.6181

New materials and processes for field emission ion and electron emitters
journal, March 2013

Large optical field enhancement for nanotips with large opening angles
journal, June 2015
  • Thomas, Sebastian; Wachter, Georg; Lemell, Christoph
  • New Journal of Physics, Vol. 17, Issue 6, Article No. 063010
  • DOI: 10.1088/1367-2630/17/6/063010

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