Vapor Phase Exchange of Self-Assembled Monolayers for Engineering of 
Biofunctional Surfaces

Kankate, Laxman; Aguf, A.; Großmann, H.; Schnietz, M.; Tampé, R.; Turchanin, A.; Gölzhäuser, A.

doi:10.1021/acs.langmuir.6b04207

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Vapor Phase Exchange of Self-Assembled Monolayers for Engineering of Biofunctional Surfaces

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Kankate, Laxman
Department of Physics, Physics of Supramolecular Systems and Surfaces, University of Bielefeld;
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Kankate, L., Aguf, A., Großmann, H., Schnietz, M., Tampé, R., Turchanin, A., et al. (2017). Vapor Phase Exchange of Self-Assembled Monolayers for Engineering of Biofunctional Surfaces. Langmuir, 33(15), 3847-3854. doi:10.1021/acs.langmuir.6b04207.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-46D2-0

Abstract

We show that 4′-nitro-1,1′-biphenyl-4-thiol selfassembled monolayers (NBPT SAMs) on gold can be exchanged with 11-(mercaptoundecyl)triethylene glycol (C₁₁EG₃OH) SAMs via vapor deposition (VD). The pristine and the exchanged SAMs obtained by VD as well as solution method (SM) were characterized by X-ray photoelectron spectroscopy (XPS) and polarization modulation infrared reflection−absorption spectroscopy (PMIRRAS). Using surface plasmon resonance (SPR), it is shown that C₁₁EG₃OH SAMs on gold obtained by vapor deposition exchange (VD_Ex) have the same protein resistivity as SAMs obtained by the direct self-assembly process. As expected, the cross-linked NBPT SAM are found to be resistive to both exchange processes, VD_Ex and solution method exchange (SM_Ex). In this way, VD_Ex opens up an elegant and new approach of patterning SAM surfaces in situ at vacuum conditions without using any solvents. By combining electron irradiation-induced chemical lithography of NBPT SAMs with VD_Ex, biofunctional patterned substrates were engineered and used for immobilization of protein arrays.