Fabrication of layer-by-layered nanocomposite film with conducting polymers and cobalt-ferrite and its optical and electrical properties

INOR 310

Shin Woo Ha, cinoo76@snu.ac.kr1, Tae-Jong Yoon, hangahe1@snu.ac.kr2, and Jin-Kyu Lee, jinklee@snu.ac.kr2. (1) Department of Chemistry, Seoul National Univeristy, Seoul, 151-747, South Korea, (2) Department of Chemistry, Seoul National University, Seoul, 151-747, South Korea
Cobalt-ferrite (CoFe2O4), magnetic nanoparticles (MNPs) were prepared and their surface was modified with multidentate capping molecules. Unlike other ferrofluid solutions, surface modified MNPs in our system have an excellent stability independently on the broad range of pH including at the neutral condition, which make it possible to use modified MNPs for layer-by-layer(LbL) self-assembly fabrication. Positively-charged PPV precursor, poly(p-xylene tetrahydrothiophenium chloride), and negatively-charged PEDOT/SPS, poly(3,4-ethylenedioxythiophene)/sulfonated polystyrene, were employed and modified MNPs were deposited after appropriate thickness of polymer bilayers were assembled. All of LbL nanocomposite films were annealed at 300°C under vacuum to convert PPV precursor polymers into conjugated polymer. The morphology and thickness of LbL multilayer films were characterized by AFM, FE-SEM and cross-sectional TEM. Interesting electronic and magnetic properties from prepared novel structures will be discussed.
 

Nanoscience: Applications
7:00 PM-10:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster

Division of Inorganic Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006