title: Pattern formation through selective chemical transformation of self-assembled benzaldimine monolayer by soft X-ray irradiation.
abstract: Benzaldimine monolayer was exposed to soft X-rays, and the involved chemical transformation was investigated using X-ray photoelectron spectra and near-edge X-ray absorption fine structure spectroscopy. The spectroscopy indicated that irradiation of soft X-ray (550 eV)-induced selective transformation of the imine group into a nonhydrolyzable one, i.e., the amine group. Utilizing the selective chemical transformation of the imine group with the soft X-ray irradiation, we were able to generate a micropattern. AFM images showed that the patterning with alternating surface topology was effective. The patterned monolayer was further modified with biotin and Cy3-tagged Streptavidin sequentially. Fluorescence images showed that the above molecules were selectively immobilized onto the amine-terminated region of the patterned surface. The current system is found to be more efficient than the predecessor, 4-nitrobenzaldimine monolayer.
authors.affiliation: Center for Integrated Molecular Systems, Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, San 31 Hyoja-dong, Pohang 790-784, South Korea.
authors.forename: Yu Jin
authors.initials: YJ
authors.lastname: Jung
authors.forename: Jung-Im
authors.initials: JI
authors.lastname: Kim
authors.forename: Tai-Hee
authors.initials: TH
authors.lastname: Kang
authors.forename: Kyuwook
authors.initials: K
authors.lastname: Ihm
authors.forename: Ki-Jeong
authors.initials: KJ
authors.lastname: Kim
authors.forename: Bongsoo
authors.initials: B
authors.lastname: Kim
authors.forename: Joon Won
authors.initials: JW
authors.lastname: Park
mesh_terms: D007097:Imines / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D036103:Nanotechnology / Q000379:methods*; D013057:Spectrum Analysis; D013499:Surface Properties; D014965:X-Rays
chemical_list: D007097:Imines