title: The effect of surface modifications of carbon nanotubes on the electrical properties of inkjet-printed SWNT/PEDOT-PSS composite line patterns.
abstract: We prepared nanocomposite inks of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) filled with single-walled carbon nanotubes (SWNTs) purified by acidic treatment, carboxylated by chemical oxidation and carboxyl-functionalized nanotubes physically modified with a natural gum, gum arabic. Inkjet printing of line patterns with a feature size of 100 microm width and lengths ranging from 1 to 5 cm was performed on glass substrates with a piezoelectric inkjet printer. The carboxyl-functionalized SWNT-based composite demonstrated a significant decrease (fourfold) of electrical resistance for the line patterns compared to that with a purified CNT-based composite due to improved dispersability of nanotubes in the polymer matrix. The use of gum arabic for the dispersion of carboxyl-functionalized nanotubes demonstrated a further drastic decrease (18-fold) of the resistance compared with a purified CNT-based composite owing to the formation of an extended continuous network within the line pattern. The inkjet-printed conductive patterns can be applied in various fields, such as flexible high speed transistors, high efficiency solar cells and transparent electrodes.
authors.affiliation: Department of Molecular Science and Technology, Ajou University, Suwon, Republic of Korea.
authors.forename: C K
authors.initials: CK
authors.lastname: Najeeb
authors.forename: Jae-Hyeok
authors.initials: JH
authors.lastname: Lee
authors.forename: Jingbo
authors.initials: J
authors.lastname: Chang
authors.forename: Jae-Ho
authors.initials: JH
authors.lastname: Kim