title: Photopatternable poly(4-styrene sulfonic acid)-wrapped MWNT thin-film source/drain electrodes for use in organic field-effect transistors.
abstract: We describe the cross-linking of poly(4-styrene-sulfonic acid) (PSS) by exposure to ultraviolet (UV) light (λ = 255 nm) under a vacuum. Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) showed that the photo-crosslinking of PSS resulted from coupling between radicals that were generated in the polymer chains by UV excitation. The photo-cross-linkable characteristics of PSS were employed to fabricate solution-processable, photopatternable, and conductive PSS-wrapped multiwalled carbon nanotube (MWNT) composite thin films by wrapping MWNTs with PSS in water. During photo-cross-linking, the work function of the PSS-wrapped MWNTs decreased from 4.83 to 4.53 eV following cleavage of a significant number of sulfonic acid groups. Despite the decreased work function of the PSS-wrapped MWNTs, the photopatterned PSS-wrapped MWNTs produced good source/drain electrodes for OFETs, yielding a mobility (0.134 ± 0.056 cm²/(V s)) for the TIPS-PEN field-effect transistors fabricated using PSS-wrapped MWNTs as source/drain electrodes that was higher than the mobility of gold-based transistors (0.011 ± 0.004 cm²/(V s)).
authors.affiliation: Polymer Research Institute, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea.
authors.forename: Kipyo
authors.initials: K
authors.lastname: Hong
authors.forename: Se Hyun
authors.initials: SH
authors.lastname: Kim
authors.forename: Chanwoo
authors.initials: C
authors.lastname: Yang
authors.forename: Won Min
authors.initials: WM
authors.lastname: Yun
authors.forename: Sooji
authors.initials: S
authors.lastname: Nam
authors.forename: Jaeyoung
authors.initials: J
authors.lastname: Jang
authors.forename: Chanjun
authors.initials: C
authors.lastname: Park
authors.forename: Chan Eon
authors.initials: CE
authors.lastname: Park
mesh_terms: D004566:Electrodes; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013451:Sulfonic Acids / Q000737:chemistry*; D013499:Surface Properties; D014173:Transistors, Electronic
chemical_list: D037742:Nanotubes, Carbon; D011108:Polymers; D013451:Sulfonic Acids; C077114:styrenesulfonic acid polymer