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Enhanced field emission from CuO nanowire arrays by in situ laser irradiation
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Typical cross-sectional SEM of as-grown CuO nanowire arrays. (b) Setup for the laser enhanced field emission study.

Image of FIG. 2.
FIG. 2.

Photoabsorption spectrum of CuO nanowires in absolute ethanol solvent.

Image of FIG. 3.
FIG. 3.

(a) Typical field emission curves of CuO nanowire arrays with or without laser irradiation. Inset shows the time response of current density under fixed electric field subject to on and off the laser irradiation with power density of . (b) Time response of current under laser irradiation with different power densities. (c) Time response of current under laser irradiation under different electric fields.

Image of FIG. 4.
FIG. 4.

(a) Field emission enhancement under the irradiation of laser with wavelengths of 1550, 808, and . (b) Emission current enhancement vs applied field for different laser wavelengths.

Image of FIG. 5.
FIG. 5.

(a) Comparison of effect of lasers with the same power density but different wavelengths. (b) Magnified decay edge marked in (a). Decay time factors of 2.7 and can be obtained by fitting the first data for 1064 and laser irradiations. Inset of (b) shows the semilog plot after subtracting the background.

Image of FIG. 6.
FIG. 6.

(a) Continuous curves under high vacuum. (b) curves under lower vacuum.

Image of FIG. 7.
FIG. 7.

Schematic showing laser irradiation assisted field emission process.

Image of FIG. 8.
FIG. 8.

Field emission enhancement ratios as function of (a) laser power density and (b) dark current density.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhanced field emission from CuO nanowire arrays by in situ laser irradiation