Surface-Grafting of Polyglutamate on Si Wafer Using Micro Contact Printing

Abstract

Surface-grafting of poly(γ-benzyl-α, L-glutamate) (PBLG) on the 3-aminopropyl triethoxysilane (APS) pretreated silicone substrates was conducted by the monomer, γ-benzyl-L-glutamate N-carboxyanhydride (BLG-NCA) which was synthesized through the phosgenation procedure. PBLG, one of liquid crystalline polymers, micro-patterns were fabricated by micro-contact printing (μCP) and surface-grafting method. Then, PBLG patterns were characterized with electron microscopy (SEM), atomic force microscopy (AFM), infrared spectroscopy (FT-IR), Raman spectroscopy and polarized optical microscopy. α-helix conformation of PBLG was dominated on the patterned surface which was confirmed by FT-IR spectroscopy. From the polarizing microscope images, lyotropic liquid crystalline properties of the patterned surfaces were observed. The SEM and AFM images show that the height of PBLG patterns was 300 nm and line width was 15 μm. The interval between lines was about 5 μm.

Keywords:

• lyotropic liquid crystalline property
• micro-contact printing
• PBLG
• surface grafting

Acknowledgments

This work was supported by the research fund from ABRL program of KRF. J. Kim thanks the National R&D project for Nano Science & Technology in ITEP.