Journal article

Authors list: Schönfeld, F; Meyer, LV; Mühlbach, F; Zottnick, SH; Müller-Buschbaum, K

Publication year: 2018

Pages: 2588-2595

Journal: Journal of Materials Chemistry C Materials for optical and electronic devices

Volume number: 6

Issue number: 10

ISSN: 2050-7526

DOI Link: https://doi.org/10.1039/c7tc05002j

Publisher: Royal Society of Chemistry

Abstract: 
Optical isotherms as a novel fundamental characterization method for MOF sensors are presented by a combination of simultaneous monitoring of sorption processes of different analyte gases (N-2, Ar, CO2, and O-2) together with in situ photoluminescence spectroscopy. Thereby, a direct correlation of both properties, luminescence and adsorption, is achieved, which provides a direct quantitative access to the effect of the MOF-analyte interaction on the photoluminescence of a MOF system. In addition, changes in equilibration time of the sorption process, temperature dependence and cyclic repetition can be systematically investigated. Thereby, optical isotherms establish a frame of reference for MOF luminescence sorption sensors. The MET MOF system (MET = metal triazolate) was chosen as a porous model candidate. A strong intensity increase of the photoluminescence of the MET-type MOF (3)(infinity)[Zn(Tz)(2)], (Tz(-) = 1,2,3-triazolate), was achieved by introduction of Mn2+ as a luminescence activator. Statistical replacement of Zn2+ with Mn2+ in (3)(infinity)[Zn0.9Mn0.1(Tz)(2)] retains the original structural microporosity. The obtained optical isotherms were further compared to results from a nonporous, luminescent coordination polymer (3)(infinity)[Sr0.95Eu0.05(Im)(2)] in order to elaborate the novel characterization concept in a broader context, showing that this concept is a fundamental step to achieve quantitative read-out of the sensing signal for both, porous and dense systems.

Harvard Citation style: Schönfeld, F., Meyer, L., Mühlbach, F., Zottnick, S. and Müller-Buschbaum, K. (2018) Optical isotherms as a fundamental characterization method for gas sensing with luminescent MOFs by comparison of open and dense frameworks, Journal of Materials Chemistry C Materials for optical and electronic devices, 6(10), pp. 2588-2595. https://doi.org/10.1039/c7tc05002j

APA Citation style: Schönfeld, F., Meyer, L., Mühlbach, F., Zottnick, S., & Müller-Buschbaum, K. (2018). Optical isotherms as a fundamental characterization method for gas sensing with luminescent MOFs by comparison of open and dense frameworks. Journal of Materials Chemistry C Materials for optical and electronic devices. 6(10), 2588-2595. https://doi.org/10.1039/c7tc05002j