Self-assembled mesoporous zeolitic imidazolate framework-8 (ZIF-8) nanocrystals bearing thiol groups for separations technologies
- Segovia, Gustavo Manuel
- Tuninetti, Jimena Soledad
- Azzaroni, Omar
- Rafti, Matias
DOIAbstract
Colloidal suspensions of Zn-based ZIF-8 metal-organic framework (MOF) particles were synthesized (both micrometer μ-ZIF-8- and nanometer n-ZIF-8-sized, respectively). Postsynthetic modification was carried using 2-amino-ethanethiol (cysteamine or Cys), a thiol-bearing monodentate ligand, and particles obtained were employed for the assembly of films on gold-coated electrode surfaces. The results obtained show that, aside from conferring chemical affinity toward Au, when suitable molar ratios are employed, cysteamine modification causes partial coordinative chemical etching of inherently microporous ZIF-8 units, thus giving rise to additional mesoporosity. Cysteamine concentration and exposure time were found to act as control parameters ult...
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