Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7986766 | Micron | 2014 | 7 Pages |
Abstract
Cold-field emission properties of carbon cone nanotips (CCnTs) have been studied in situ in the transmission electron microscope (TEM). The current as a function of voltage, i(V), was measured and analyzed using the Fowler-Nordheim (F-N) equation. Off-axis electron holography was employed to map the electric field around the tip at the nanometer scale, and combined with finite element modeling, a quantitative value of the electric field has been obtained. For a tip-anode separation distance of 680 nm (measured with TEM) and a field emission onset voltage of 80 V, the local electric field was 2.55 V/nm. With this knowledge together with recorded i(V) curves, a work function of 4.8 ± 0.3 eV for the CCnT was extracted using the F-N equation.
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Authors
Ludvig de Knoop, Florent Houdellier, Christophe Gatel, Aurélien Masseboeuf, Marc Monthioux, Martin Hÿtch,