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Jong-Il Park, Woo-Ram Lee, Sung-Soo Bae, Youn Joong Kim, Kyung-Hwa Yoo, Jinwoo Cheon*, and Sehun Kim*
"Langmuir Monolayers of Co Nanoparticles and Their Patterning by Microcontact Printing"
J. Phys. Chem. B, 109​ (27), 13119-13123
Date: Apr 18, 2005

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 LangmuirBlodgett (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.

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