Details
| Original language | English |
|---|---|
| Pages (from-to) | 7008-7020 |
| Number of pages | 13 |
| Journal | Crystal Growth and Design |
| Volume | 22 |
| Issue number | 12 |
| Early online date | 28 Nov 2022 |
| Publication status | Published - 7 Dec 2022 |
Abstract
The growth of zeolitic imidazolate framework (ZIF) thin films is an interesting topic, since ZIFs have a high thermal and chemical stability compared to many other MOFs. A variety of functionalities can be introduced via the imidazole linker molecule. Here, we report on a new approach for the preparation of thin films of a novel ZIF material: Co-ZIF-90. The preparation of thin films is possible on silicon or glass when ZIF-8 seeding layers are deposited first. The resulting constructions are effectively MOF-on-MOF layer systems. The synthesis procedure has been optimized with regard to obtaining high-quality thin films of Co-ZIF-90 on ZIF-8 for optical applications. Notably, the preparation of Co-ZIF-90 thin films is possible only by using a mixture of two different cobalt precursor salts (acetate and nitrate). The thin films are characterized in detail. With regard to the use as an optical material, UV-vis absorption spectra of the MOF-on-MOF constructs were measured and the refractive index of Co-ZIF-90 was determined using ellipsometry. Furthermore, the refractive index of the Co-ZIF-90 film can be modulated reversibly by the adsorption and desorption of water via the gas phase. The kinetics of this fast process are on the time scale of 1 s. In addition to the preparation of thin films, we obtained Co-ZIF-90 as a powder sample and basically characterized the powder. The approach to use an easy-to-crystallize ZIF-8 film as a seeding layer for the growth of films of other ZIFs may be extended as a general concept for the deposition of crystalline ZIF layers in such cases, where a direct deposition is difficult or not possible.
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Crystal Growth and Design, Vol. 22, No. 12, 07.12.2022, p. 7008-7020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Seeding Layer Approach for the Synthesis of Co-ZIF-90 Thin Films of Optical Quality
AU - Keppler, Nils Christian
AU - Fricke, Johanna
AU - Schaate, Andreas
AU - Hannebauer, Adrian
AU - Hindricks, Karen Deli Josephine
AU - Zailskas, Saskia
AU - Behrens, Peter
N1 - Funding Information: This work was funded by the Deutsche Forschungsgemeinschaft (DFG) under Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). Karen Hindricks thanks the Studienstiftung des Deutschen Volkes (German National Academic Foundation) for a scholarship. Adrian Hannebauer thanks the HSN (Hannover School for Nanotechnology) for a scholarship. We thank Younes Senft for building the UV/vis measurement cell.
PY - 2022/12/7
Y1 - 2022/12/7
N2 - The growth of zeolitic imidazolate framework (ZIF) thin films is an interesting topic, since ZIFs have a high thermal and chemical stability compared to many other MOFs. A variety of functionalities can be introduced via the imidazole linker molecule. Here, we report on a new approach for the preparation of thin films of a novel ZIF material: Co-ZIF-90. The preparation of thin films is possible on silicon or glass when ZIF-8 seeding layers are deposited first. The resulting constructions are effectively MOF-on-MOF layer systems. The synthesis procedure has been optimized with regard to obtaining high-quality thin films of Co-ZIF-90 on ZIF-8 for optical applications. Notably, the preparation of Co-ZIF-90 thin films is possible only by using a mixture of two different cobalt precursor salts (acetate and nitrate). The thin films are characterized in detail. With regard to the use as an optical material, UV-vis absorption spectra of the MOF-on-MOF constructs were measured and the refractive index of Co-ZIF-90 was determined using ellipsometry. Furthermore, the refractive index of the Co-ZIF-90 film can be modulated reversibly by the adsorption and desorption of water via the gas phase. The kinetics of this fast process are on the time scale of 1 s. In addition to the preparation of thin films, we obtained Co-ZIF-90 as a powder sample and basically characterized the powder. The approach to use an easy-to-crystallize ZIF-8 film as a seeding layer for the growth of films of other ZIFs may be extended as a general concept for the deposition of crystalline ZIF layers in such cases, where a direct deposition is difficult or not possible.
AB - The growth of zeolitic imidazolate framework (ZIF) thin films is an interesting topic, since ZIFs have a high thermal and chemical stability compared to many other MOFs. A variety of functionalities can be introduced via the imidazole linker molecule. Here, we report on a new approach for the preparation of thin films of a novel ZIF material: Co-ZIF-90. The preparation of thin films is possible on silicon or glass when ZIF-8 seeding layers are deposited first. The resulting constructions are effectively MOF-on-MOF layer systems. The synthesis procedure has been optimized with regard to obtaining high-quality thin films of Co-ZIF-90 on ZIF-8 for optical applications. Notably, the preparation of Co-ZIF-90 thin films is possible only by using a mixture of two different cobalt precursor salts (acetate and nitrate). The thin films are characterized in detail. With regard to the use as an optical material, UV-vis absorption spectra of the MOF-on-MOF constructs were measured and the refractive index of Co-ZIF-90 was determined using ellipsometry. Furthermore, the refractive index of the Co-ZIF-90 film can be modulated reversibly by the adsorption and desorption of water via the gas phase. The kinetics of this fast process are on the time scale of 1 s. In addition to the preparation of thin films, we obtained Co-ZIF-90 as a powder sample and basically characterized the powder. The approach to use an easy-to-crystallize ZIF-8 film as a seeding layer for the growth of films of other ZIFs may be extended as a general concept for the deposition of crystalline ZIF layers in such cases, where a direct deposition is difficult or not possible.
UR - http://www.scopus.com/inward/record.url?scp=85143508384&partnerID=8YFLogxK
U2 - 10.1021/acs.cgd.2c00664
DO - 10.1021/acs.cgd.2c00664
M3 - Article
AN - SCOPUS:85143508384
VL - 22
SP - 7008
EP - 7020
JO - Crystal Growth and Design
JF - Crystal Growth and Design
SN - 1528-7483
IS - 12
ER -