Langmuir monolayers of Co nanoparticles and their patterning by microcontact printing.
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.
Park
Jong-Il
JI
Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
Lee
Woo-Ram
WR
Bae
Sung-Soo
SS
Kim
Youn Joong
YJ
Yoo
Kyung-Hwa
KH
Cheon
Jinwoo
J
Kim
Sehun
S