Self-assembly of Nanoparticulated MOFs on Gold Surfaces via Thiol Chemistry: Cysteamine coated ZIF-8 Colloidal Building Blocks
G. M. Segovia, J. S. Tuninetti, S. E. Moya, A. S. Picco, M. R. Ceolín, O. Azzaroni, M. Rafti
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
Abstract: In this work we have explored chemical modification of metal organic framework (MOF) nanocrystals(1), in order to confer them chemical affinity toward gold substrates. The modified MOF nanocrystals were used as building blocks for fast and selective self-assembly of porous films. Cysteamine (2-aminoethanothiol) was used as chemical modulator and functionalization agent of Zeolitic Imidazolate Framework-8 (ZIF-8)(2). Important parameters such as crystal size, polydispersity, morphology, and crystalline structure were studied through small- and wide-angle X rays scattering. Assembly process was followed in-situ with a quartz crystal microbalance; whereas electrochemical essays showed that the cysteamine modified nanocrystals bind to the gold substrate through thiol-gold bond.
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2. Wang, B.; Côté, A. P.; Furukawa, H.; O’Keeffe, M.; Yaghi, O. M. Nature, Vol 453, 207–211, 2008.