| 초록 |
Multi-walled carbon nanotubes (MWNTs) were non-covalently wrapped with poly(4-styrene sulfonic acid) (PSS) and poly(allylamine) (PAA). The work function of the pristine MWNTs was determined with ultra-violet photoemission spectroscopy to be 4.47 eV. When the MWNTs were wrapped with PSS, having pendant groups with a negative dipole, the work function was increased to 4.83 eV. In contrast, wrapping the MWNTs with PAA was found to lower the work function (3.52 eV) due to the positive dipoles of the pendant groups of PAA. Further, these work function shifts were reflected in the hole-injection characteristics of hole-only devices fabricated with the polymer-wrapped MWNTs. |
