(Color online) (a) SEM image of bended yarn; (b) magnified SEM image of the tips of the yarn; (c) schematic model of the MWCNT yarn, heating electrodes, and phosphor anode; (d) image of yarn heated to incandescence; the dashed lines indicate the position of the electrodes.
(Color online) (a) FE curves of MWCNT yarn at different temperatures; (b) FN curves at different temperatures; the curves below are roughly divided into four parts.
(Color online) (a) FE current switches between RT and 1332 K; (b) FE anode phosphor images at RT and 1332 K.
(Color online) Partial pressure as a function of time for the 12 main residual gases species.
(Color online) FE anode phosphor images at different voltages; the labels of each subpicture are the exposure times for taking the photo and the voltage, respectively.
(Color online) FE current recovery time as a function of vacuum pressure; the black squares are the experimental results and the red solid line is used to guide the eyes.
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