Cysteamine-modified ZIF-8 colloidal building blocks: Direct assembly of nanoparticulate MOF films on gold surfaces via thiol chemistry

Author(s)

Segovia, Gustavo M. ^{[1, 2]} ; Tuninetti, Jimena S. ^[1] ; Moya, Sergio ^[3] ; Picco, Agustin S. ^{[4, 1]} ; Ceolin, Marcelo R. ^[1] ; Azzaroni, Omar ^[1] ; Rafti, Matias ^[1]

Affiliation

^[1] Univ Nacl La Plata, Fac Cs Exactas, Inst Invest Fis Quim Teor & Aplicadas INIFTA, CONICET, 64 & Diag 113, RA-1900 La Plata, Buenos Aires - Argentina

^[2] Univ Nacl San Martin, San Martin, Buenos Aires - Argentina

^[3] CIC BiomaGUNE, Parque Cient & Tecnol Gipuzkoa, Paseo Miramon 182, Donostia San Sebastian 20014, Gipuzkoa - Spain

^[4] CNPEM, LNLS, Lab Nacl Nanotecnol LNNano, Caixa Postal 6192, BR-13083970 Campinas, SP - Brazil

• Document type: Journal article
• Source: MATERIALS TODAY CHEMISTRY; v. 8, p. 29-35, JUN 2018.
• Web of Science Citations: 2

Abstract

Chemical modification of metal organic framework (MOF) nanocrystal colloids was used to endow them with chemical affinity for gold substrates. Modified nanocrystals were then used as building blocks for rapid and selective self-assembly of porous films. Cysteamine (Cys, 2-aminoetanethiol) was chosen as both chemical modulator and functionalizing agent of Zeolite Imidazolate Framework-8 (ZIF-8) MOF nanocrystals. Important parameters such as the impact of the modulator on the range of nanocrystals stability, size, polydispersity, morphology, and crystalline structure were assessed via both, small and wide angle x-ray scattering (SAXS and WAXS). Cysteamine modified ZIF-8 nanocrystals were assembled into films over conductive Au substrates and film growth was followed in-situ with Quartz Crystal Microbalance (QCM). Thiol moieties exposed out of the ZIF-8 surface after cysteamine modification, results in the formation of thiol bonds with Au conductive substrates as shown via Cyclic Voltammetry experiments. The strategy here presented allows for the synthesis of pre-designed building blocks for MOF films on metal surfaces. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 14/21910-8 - EVOLUTION OF SILICA NANOPARTICLES IN BIOLOGICAL MEDIA: A STUDY ON PROTEIN CORONA FORMATION, AGGREGATION AND CELLULAR UPTAKE
• Grantee: Agustín Silvio Picco
• Support Opportunities: Scholarships in Brazil - Post-Doctoral