Multi-Layer Coating of Ultrathin Polymer Films on Nanoparticles of Alumina by a Plasma Treatment
CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Multi-layer ultrathin polymer films have been deposited on the surfaces of nanoparticles of alumina using a plasma polymerization treatment. The nanoparticles ranged from 10-150 nm in spherical shapes. High-resolution transmission electron microscopy HRTEM experiments showed that an extremely thin film of the pyrrole layer 10-20 A was uniformly deposited on the surfaces of the nanoparticles. in particular, the particles of all sizes 10-150 nm exhibited equally uniform ultrathin films indicating well-dispersed nanoparticles in the fluidized bed during the plasma treatment. After single layer coating, hexamethyldisiloxane HMDSO was coated again as a second layer onto the surface of pyrrole. Subsequently, a third layer of pyrrole was coated on the top of HMDSO film completing the multi-layer coating process. Time-of-Flight Secondary ion mass spectroscopy TOFSIMS experiments confirmed the deposition of these multi-layer thin films on the nanoparticles. The deposition mechanisms and the effects of plasma treatment parameters are discussed.
- Polymer Chemistry
- Plasma Physics and Magnetohydrodynamics