An anchoring strategy for photoswitchable biosensor technology: azobenzene-modified SAMs on Si(111)

作者：Dietrich P; Michalik F; Schmidt R; Gahl C; Mao G; Breusing M; Raschke M B; Priewisch B; Elsaesser T; Mendelsohn R; Weinelt M; Rueck Braun K^*

来源：Applied Physics A, 2008, 93(2): 285-292.

DOI：10.1007/s00339-008-4828-0

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.

• 出版日期2008-11