Surface Structural Comparison of Composite Film of Bacteriorhodopsin and Phosphatidylcholine Fabricated on Amorphous Silicon Dioxide, Crystal Silicon Dioxide, and Hydrogenated Amorphous Silicon

Abstract

A surface structural comparison of composite film of bacteriorhodopsin (BR) and phosphatidylcoline (PC) fabricated on a layered fatty acid film on a substrate of amorphous silicon dioxide (a-SiO 2 ), crystal silicon dioxide (c-SiO 2 ), or hydrogenated amorphous silicon (a-Si:H) was conducted to investigate the effect of substrate structure on the Langmuir-Blodgett (LB) film fabrication of membrane protein by direct force microscopy (DFM) measurement. On the a-SiO 2 substrate, a hexagonal crystal structure of BR and PC with a size of 0.5 mm was observed. However, on the c-SiO 2 or a-Si:H substrate, the surface structural features of the composite LB films differed from each other on the shape of assemblies in themselves. In spite of the presence of fatty acid layers, the assemby of BR and PC depends on the structure of the bottom substrate.

Visible-light-inducible voltage current property of hydrogel on laminated hydrogenated amorphous silicon film

“…Amino acids and pigments on a semiconductive a-Si:H film exhibits an interesting behavior. [25][26][27] Even with a huge molecule protein, a conformational study of protein interactions with hydrogen-passivated amorphous silicon surfaces has been performed. 28) The interaction effect between an a-Si:H film and an organic molecule might be used in the study of other organic molecular systems.…”