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We report a physical mechanism of controlling vacuum breakdown in field emission from carbon nanotubes (CNTs). The thermal evaporation or runaway of CNT emitters is considered to be responsible for destructive vacuum breakdowns due to an overcurrent through electronically shorted circuits, where misaligned or irregularly long CNT emitters were found. The occurrence of the destructive breakdown, however, could be under control after an electrical treatment using soft breakdowns. Significant improvements of field emission stability and uniformity were achieved by optimally controlled soft breakdowns, which eliminated the short circuits and recovered the field emission with no destruction of electrodes. [ABSTRACT FROM PUBLISHER]

Electroluminescence (EL) was observed on conventional cathodoluminescent (CL) phosphor with the incorporation of carbon nanotube (CNT) at ambient air. The role of CNT can be understood as enhancing the local electrical field, which allows electron injection to the active center of phosphor at relatively low operating voltages. In this EL device, the brightness of CL phosphor was significantly improved from no light emission in the case of no addition of CNT to 35 cd/m2 with 1 wt % CNT at 10 kHz of ac 300 V. [ABSTRACT FROM AUTHOR]

A polymer dielectric film with chlorine (Cl)-containing polymer additives was fabricated to investigate the effect of additives on dielectric performance. Polychlorostyrene or polyvinyl chloride (PVC) was used as a polymer additive in the polymer film. At 0.1 V and 10 Hz, the polymer dielectric film with PVC had a dielectric constant of 23.6 with a dielectric loss of 0.04. This film exhibited a 73% increase in dielectric constant compared with the film without additives. The increment in the dielectric constant was attributed to the high polarisability of Cl atoms. [ABSTRACT FROM AUTHOR]