Electronic structure and field emission properties of in situ potassium-doped single-walled carbon nanotubes

Journal Article · Mon Jan 08 00:00:00 EST 2007 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2431463· OSTI ID:20883270

Ha, Byeongchul; Lee, Cheol Jin ^[1]

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1. Department of Nano Science, Cheongju University, Cheongju 360-764 (Korea, Republic of)

In situ potassium (K)-doped single-walled carbon nanotube (SWCNT) was synthesized using a hydrogen arc-discharge method. X-ray photoelectron spectroscopy analysis showed that the K-doped SWCNTs consisted of 0.12% K mass composition. The K-doped SWCNTs showed the lower turn-on electric field of 2.0 V/{mu}m at a current density of 10{sup -9} A/cm{sup 2} and the higher emission current density of 3.0 mA/cm{sup 2} at an applied field of 4.6 V/{mu}m compared with the undoped SWCNTs. The improved field emission performance of K-doped SWCNTs was mainly attributed to the decreased work function and the increased density of state near the Fermi energy.

• OSTI ID: 20883270
• Journal Information: Applied Physics Letters, Vol. 90, Issue 2; Other Information: DOI: 10.1063/1.2431463; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
CURRENT DENSITY
DOPED MATERIALS
ELECTRIC FIELDS
ELECTRONIC STRUCTURE
FERMI LEVEL
FIELD EMISSION
HYDROGEN
NANOTUBES
POTASSIUM
WORK FUNCTIONS
X-RAY PHOTOELECTRON SPECTROSCOPY