Barium-functionalized multiwalled carbon nanotube yarns as low-work-function thermionic cathodes
APPLIED PHYSICS LETTERS 92, 153108 (2008），-0001，（）：
Barium-functionalized multiwalled carbon nanotube yarns were fabricated by drawing and twisting multiwalled carbon nanotube forests through a solution containing barium nitrate. After heat activation under vacuum, the functionalized yarns were enriched in barium oxide due to the high surface-to-volume ratio of the nanotubes. The cathodes exhibited good thermionic properties, with a work function as low as 1.73-2.06 eV and thermionic current density that exceeded 185 mA/cm2 in a field of 850 V/5 mm at 1317 K. The barium-functionalized yarns had high tensile strength of up to 420 MPa and retained strength of 250 MPa after a 2 h activation process.
版权说明：以下全部内容由姜开利上传于 2010年03月13日 14时15分44秒，版权归本人所有。