Molecular surface structures of poly (p-xylylene) coatings studied by sum frequency generation vibrational spectroscopy

ANYL 128

Arthur A. McClelland, arthurmc@umich.edu1, Hsien-Yeh Chen, hsienyc@umich.edu2, Joerg Lahann, lahann@umich.edu2, and Zhan Chen, zhanc@umich.edu3. (1) Applied Physics Program, University of Michigan, 500 E. University Ave., 2477 Randall Laboratory, Ann Arbor, MI 48109, (2) Department of Chemical Engineering, Materials Science and Engineering, and Macromolecular Science and Engineering, University of Michigan, 2300 Hayward Street, GGBL 3414, Ann Arbor, MI 48105, (3) Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, MI 48109
Thin-film polymer coatings are currently being studied for many high-tech applications including biomaterials, biosensors, insulating layers in integrated circuits, light-emitting diodes, microelectrical-mechanical systems (MEMS), and photodiodes. Poly(p-xylylenes) (PPX) with various side functional groups are a group of special polymers that are under investigation for such thin-film applications. We have applied sum frequency generation (SFG) vibrational spectroscopy to examine surface structures of various functionalized PPX in different chemical environments, including air, water, and protein solutions. Detailed surface structures of PPX with different functional side groups have been compared, and responses of these PPX surfaces to water and protein solutions have been observed. Various side chains introduced to PPX include fluorinated alkyl chains, ethylene glycol side chains, and phenyl groups. These PPX films were prepared by chemical vapor deposition on many different substrates. This research indicates that functionalized PPX coatings are well suited to modify surface structures of many materials.
 

General Papers
7:00 PM-9:00 PM, Sunday, 28 August 2005 Washington DC Convention Center -- Hall A, Poster

Division of Analytical Chemistry

The 230th ACS National Meeting, in Washington, DC, Aug 28-Sept 1, 2005