1887
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.
Double layer-coated carbon nanotubes: Field emission and secondary-electron emission properties under presence of intense electric field
Rent:
Rent this article for
USD
10.1116/1.3093886
/content/avs/journal/jvstb/27/2/10.1116/1.3093886
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/27/2/10.1116/1.3093886

Figures

Image of FIG. 1.
FIG. 1.

(a) Potential diagram between grounded circular wall and nanotube (or nanorod) that is biased at a negative voltage . (b) Experimental scheme of secondary-electron emission measurement.

Image of FIG. 2.
FIG. 2.

plots in FE from pristine and coated nanotubes. (a) represents (i) pristine, (ii) MgO-coated, and (iii) -coated MWNTs, and (b) represents FN plot of them. (Inset image: SEM image of -coated MWNT.)

Image of FIG. 3.
FIG. 3.

Band-diagram representation of the quasitunneling process associated with (a) pristine nanotubes, (b) MgO-coated nanotubes, and (c) -coated nanotubes. The work function of the nanotube is assumed to be , and the electron affinities for MgO and CsI are equal to 1.3 and , respectively. The band gaps of MgO and CsI are taken as 8 and , respectively.

Image of FIG. 4.
FIG. 4.

(Color online) Emission stability of pristine, MgO-, and -coated SWNT emitters as function of time under vacuum, exposure, and vacuum again, in sequence. In the first stage, we measured FE of the sample at a vacuum pressure of for , added to the chamber up to , then measured FE for another . Next, we measured FE again at a vacuum pressure of after evacuating from the chamber, i.e., the same base pressure with the initial stage of the experiment.

Image of FIG. 5.
FIG. 5.

Secondary-electron emission yield of the (a) MgO-coated and -coated SWNTs and (b) MgO-coated and -coated MWNTs. To obtain the line of (-✫-) monolayer coating and (-★-) double-layer coating in Fig. 5, a negative potential was driven on the sample and the remaining parts of the vacuum chamber were grounded.

Tables

Generic image for table
TABLE I.

Measured turn-on fields and calculated values obtained from Figs. 2(a) and 2(b), respectively, for pristine, MgO-coated, and -coated SWNTs/MWNTs. The maximum values obtained from Figs. 5(a) and 5(b) for both the same coated samples.

Loading

Article metrics loading...

/content/avs/journal/jvstb/27/2/10.1116/1.3093886
2009-03-20
2014-04-17
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Double layer-coated carbon nanotubes: Field emission and secondary-electron emission properties under presence of intense electric field
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/27/2/10.1116/1.3093886
10.1116/1.3093886
SEARCH_EXPAND_ITEM