Park, Young Ran Ko, Min Jae Song, Yoon-Ho Lee, Cheol Jin 2024-01-20T11:05:08Z 2024-01-20T11:05:08Z 2021-09-05 2013-10-21 0021-8979 https://pubs.kist.re.kr/handle/201004/127538 We investigated the effects of vacuum annealing on the surface electronic structure and the work function of single-walled carbon nanotubes (SWCNTs). We changed the doping type of semiconducting single-walled carbon nanotubes (semi-SWCNTs) from p-type to n-type, and investigated their optical properties. The HNO3 treated p-type SWCNT network was converted to n-type after vacuum annealing due to formation of C-N bond. The C 1s sp(2) binding energy of the vacuum annealed semi-SWCNTs was shifted toward a higher binding energy about 0.42 eV, which indicates a raising Fermi level as much as 0.42 eV compared with the intrinsic semi-SWCNTs. In addition, the work function of the vacuum annealed semi-SWCNT was observed towards lower energies. It is considered that the C-N bonding of semi-SWCNTs creates a donor level near the bottom of the conduction band, thus raising the Fermi level. The ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy revealed that the increased binding energy of C 1s sp(2) and the decreased work function of semi-SWCNTs are caused by n-type doping after vacuum annealing. (C) 2013 AIP Publishing LLC. English AMER INST PHYSICS RAY PHOTOELECTRON-SPECTROSCOPY FUNCTIONAL-GROUPS PHOTOEMISSION OXIDATION GRAPHITE TRANSISTORS STABILITY EVOLUTION POLARITY BUNDLES Surface electronic structure of nitrogen-doped semiconducting single-walled carbon nanotube networks Article 10.1063/1.4826206 1 JOURNAL OF APPLIED PHYSICS, v.114, no.15 JOURNAL OF APPLIED PHYSICS 114 15 scie scopus 000326117900028 2-s2.0-84886509570 Physics, Applied Physics Article RAY PHOTOELECTRON-SPECTROSCOPY FUNCTIONAL-GROUPS PHOTOEMISSION OXIDATION GRAPHITE TRANSISTORS STABILITY EVOLUTION POLARITY BUNDLES single-wall carbon nanotube nitrogen-doping electronic structure