University of Oulu

Jani Holopainen, Mikko J. Heikkilä, Leo D. Salmi, Kaisu Ainassaari, Mikko Ritala, Zeolitic imidazole Framework-8 (ZIF-8) fibers by gas-phase conversion of electroblown zinc oxide and aluminum doped zinc oxide fibers, Microporous and Mesoporous Materials, Volume 267, 2018, Pages 212-220, ISSN 1387-1811,

Zeolitic imidazole Framework-8 (ZIF-8) fibers by gas-phase conversion of electroblown zinc oxide and aluminum doped zinc oxide fibers

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Author: Holopainen, Jani1; Heikkilä, Mikko J.1; Salmi, Leo D.1,2;
Organizations: 1Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014, University of Helsinki, Finland
2Present Addresses. ASM Microchemistry, Pietari Kalmin katu 1 F 2, FI-00560 Helsinki, Finland.
3Environmental and Chemical Engineering, Faculty of Technology, University of Oulu, P.O. Box 4300, FI-90014, University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 6.8 MB)
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Language: English
Published: Elsevier, 2018
Publish Date: 2018-08-20


Electroblowing was used to prepare ZnO and aluminum doped zinc oxide (AZO, 1–3 cation-% of Al) fibers. The as-blown fibers were calcined at 500 °C to obtain the target material. The average fiber diameters ranged from 240 ± 60 nm for ZnO fibers to 330 ± 80 nm for AZO with 3% Al. Smaller crystallite size was measured with x-ray diffraction for the Al doped fibers. Electroblowing was found out be an effective method to increase the fiber productivity over electrospinning and other methods reported in literature to prepare AZO fibers as a high production rate of 0.32 g/h was achieved. The ZnO and AZO fibers could be converted to zeolitic imidazole framework-8 [ZIF-8, zinc(2-methylimidazolate)₂] by a solvent free thermal treatment in an autoclave under 2-methylimidazole (HmIM) vapor at 150 and 200 °C while preserving the fibrous structure. The conversion process to ZIF-8 occurred faster at higher temperatures and on fibers with smaller crystallite size. Depending on the conversion treatment time either ZnO/ZIF-8 and AZO/ZIF-8 core/shell fibers or ZIF-8 fibers could be obtained. At best the prepared ZIF-8 fibers had a very high BET specific surface area of 1340 m²/g.

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Series: Microporous and mesoporous materials
ISSN: 1387-1811
ISSN-E: 1873-3093
ISSN-L: 1387-1811
Volume: 267
Pages: 212 - 220
DOI: 10.1016/j.micromeso.2018.04.003
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
116 Chemical sciences
Funding: This work was supported by the Finnish Centre of Excellence in Atomic Layer Deposition.
Copyright information: © 2018 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (