banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Flexible carbon nanotube-array cathodes: Fabrication and bending effect on field-electron emission
Rent this article for
View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Sketch of the process used to fabricate a freestanding flexible cathode based on a VACNT-column array. First, synthesize a VACNT-column array on a silicon substrate by combining HFCVD and photolithographic patterning processes: see the SEM image in (b). Second, lay down the VACNT-column array upside down on a metal sheet covered with an uncured spin-coated PDMS prepolymer, then cure PDMS at for 2 min by using a hot plate [see the photograph in (c)]. Third, detach the VACNT-PDMS emitter from both the Si substrate and metal sheet: see the photograph in (d). Finally, etch the back side of the freestanding VACNT-PDMS emitter by the mixture of TBAF and NMP.

Image of FIG. 2.
FIG. 2.

(Color online) (a) SEM image of the PDMS-free top surface of a VACNT column; inset: illustration of a freestanding PDMS-CNT film; (b) high magnification SEM image of nanotubes top surface showing no trace of PDMS.

Image of FIG. 3.
FIG. 3.

(Color online) Schematic sketch of field-emission test on bending cathode; a photograph illustrates bendable PDMS-CNT film (upper inset); a plan-view image of the undeformed SWCNT-PDMS emitter (lower inset).

Image of FIG. 4.
FIG. 4.

(a) curves and corresponding FN plots (inset) of the flexible CNT-emitter cathode under different bending angle and anode-cathode distance; at 0° and , at 0° and , at 36.5° and , at 50° and , at 66.5° and , at 66.5° and , and at 66.5° and . (b) curves measured at the bending angle of 66.5° and anode-cathode gap of ; the first bending (open circles) and after going through a few hundred times of bending (solid circles).

Image of FIG. 5.
FIG. 5.

Electric field distributions at the surfaces of bent cathodes from a series of COMSOL simulation: (a) equipotential lines corresponding to the bias voltage of 2000 V at the bending angle of 66.5° and (b) electric field at the position of column at the bending angles of 0°, 36.5°, 50°, and 66.5° and the anode-cathode distances of 570, 870, 1070, and .


Article metrics loading...


Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Flexible carbon nanotube-array cathodes: Fabrication and bending effect on field-electron emission