title: Langmuir monolayers of Co nanoparticles and their patterning by microcontact printing.
abstract: In this paper, we describe an easy and reliable method for the production of patterned monolayers of Co nanoparticles. A two-dimensional monolayer of Co nanoparticles is fabricated by spreading a nanoparticle solution over an air-water interface and then transferring it to a hydrophobic substrate by using the Langmuir-Blodgett (LB) method. Transmission electron microscopy (TEM) was used to show that, with increasing surface pressure, the Co nanoparticles become well-organized into a Langmuir monolayer with a hexagonal close-packed structure. By controlling the pH of the subphase, it was found that a monolayer of Co nanoparticles with long-range order could be obtained. Further, by transferring the Langmuir monolayer onto a poly(dimethoxysilane) (PDMS) mold, the selective micropatterning of the Co nanoparticles could be achieved on a patterned electronic circuit. The electronic transport properties of the Co nanoparticles showed the ohmic I-V curve.
authors.affiliation: Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
authors.forename: Jong-Il
authors.initials: JI
authors.lastname: Park
authors.forename: Woo-Ram
authors.initials: WR
authors.lastname: Lee
authors.forename: Sung-Soo
authors.initials: SS
authors.lastname: Bae
authors.forename: Youn Joong
authors.initials: YJ
authors.lastname: Kim
authors.forename: Kyung-Hwa
authors.initials: KH
authors.lastname: Yoo
authors.forename: Jinwoo
authors.initials: J
authors.lastname: Cheon
authors.forename: Sehun
authors.initials: S
authors.lastname: Kim