Pattern formation through selective chemical transformation of self-assembled benzaldimine monolayer by soft X-ray irradiation.
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.
Jung
Yu Jin
YJ
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.
Kim
Jung-Im
JI
Kang
Tai-Hee
TH
Ihm
Kyuwook
K
Kim
Ki-Jeong
KJ
Kim
Bongsoo
B
Park
Joon Won
JW
D007097:Imines / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D036103:Nanotechnology / Q000379:methods*; D013057:Spectrum Analysis; D013499:Surface Properties; D014965:X-Rays
D007097:Imines