Title

Low voltage electron emission from calcium carbonate whiskers coated with a thin layer of gold

Abstract

Cold cathode electron field emission from aragonite CaCO3 whiskers coated with 10-nm-thick gold has been observed. The microstructure of the whiskers grown on a Ni substrate by electrochemical deposition has been examined by scanning electron microscope, energy dispersive x-ray spectrometer, x-ray diffraction spectrometer, and Raman spectroscopy. For a 220 μm anode-cathode gap, emission current densities in excess of ∼2 × 10-6 A/cm2 are observed for applied voltages of 660 V or greater. Although it is believed that the electric field is locally enhanced by the geometry of the whiskers, the voltage required increases roughly linearly with the anode-cathode spacing, corresponding to a turn-on field of approximately 3 V/μm, and an emission current density of 0.4 mA/cm2 has been obtained for an applied field of 5.5 V/μm. © 1997 American Institute of Physics.

Publication Date

10-15-1997

Publication Title

Journal of Applied Physics

Volume

82

Issue

8

Number of Pages

4051-4054

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1063/1.365714

Socpus ID

0005056952 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0005056952

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