Abstract
Wet spun carbon nanotube fibers were characterized using both field emission and electron energy distribution measurements. Fowler-Nordheim analysis of the field emission results showed that the carbon fibers demonstrated a large effective emission area, 2 x 10-12 m2, which resulted in a reduced brightness of 1.84 x 1010 A/m2/sr/V. By considering the emission and number of carbon nanotube emitters it can be shown that the brightness is consistent with previous reports for single nanotube emitters. Additionally, using the effective emission area determined from the Fowler-Nordheim analysis an emittance value around 0.70 μm was found. These characteristics are useful metrics in determining the applicability of using wet spun carbon nanotube fibers for field emission devices.
Highlights
Scitation.org/journal/adv pressure of 7 x 10-10 and 1 x 10-10 Torr, respectively
Once the field electron emission (FE) experiments were complete the sample was transferred into an analysis chamber for electron energy distribution (EED) measurements
Higher G/D ratios have been obtained with ws-carbon nanotubes (CNTs) we note that the quality of the fibers were sufficient for FE experiments
Summary
Scitation.org/journal/adv pressure of 7 x 10-10 and 1 x 10-10 Torr, respectively. FE measurements were carried out in the prep chamber. Most reported metrics deal with individual multi-walled or single-walled CNT emitters21,22 The intent of this paper is to evaluate the field emission and electron energy distribution properties of ws-CNFs to determine their brightness and emittance. Once the FE experiments were complete the sample was transferred into an analysis chamber for electron energy distribution (EED) measurements.
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