Large refractive index changes in ZIF-8 thin films of optical quality

authored by

Nils Christian Keppler, Karen Deli Josephine Hindricks, Peter Behrens

Abstract

ZIF-8 (zeolitic imidazolate framework-8) is a member of the growing family of metal-organic frameworks (MOFs). Homogeneous and crack-free ZIF-8 thin films of optical quality were crystallized on silicon and glass substrates. The refractive index of such ZIF-8 thin films in the complete visible light spectrum was directly determined for the first time. By incubating the porous films in different substances, the refractive index could be modulated over a wide range, two times larger than previously reported for MOF thin films. Reversible refractive index switching in ZIF-8 thin films was performed via the liquid and the gas phase. The ability to adjust the refractive index over a broad range enables the use of ZIF-8 films for applications in optical devices such as sensors, coatings for mirrors and lenses, or as an optical medium in more complex optical devices.

Organisation(s)

Institute of Inorganic Chemistry
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines

Type

Article

Journal

RSC Advances

Volume

12

Pages

5807-5815

No. of pages

9

ISSN

2046-2069

Publication date

2022

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Chemistry(all), Chemical Engineering(all)

Electronic version(s)

https://doi.org/10.1039/d1ra08531j (Access: Open)