Abstract
A mild and efficient procedure has been developed to obtain covalently attached self-assembled monolayers (SAMs) on Si(111) with photochromic azobenzene head-groups. Starting from neat or diluted carboxylic acid functionalized monolayers on-chip coupling reactions were applied to attach hydroxyl-functionalized azobenzene units to the SAMs by ester bond formation. The modified surfaces were characterized by high-resolution X-ray photoelectron spectroscopy (XPS), transmission Fourier transform infrared spectroscopy (FT-IR), and contact angle measurements. Reversible cis ↔ trans isomerizations of photoswitchable SAMs were monitored by wettability measurements.
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Dedicated with respect and compliments to Professor Helmut Schwarz on the occasion of his 65th birthday.
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Dietrich, P., Michalik, F., Schmidt, R. et al. An anchoring strategy for photoswitchable biosensor technology: azobenzene-modified SAMs on Si(111). Appl. Phys. A 93, 285–292 (2008). https://doi.org/10.1007/s00339-008-4828-0
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DOI: https://doi.org/10.1007/s00339-008-4828-0