Issue 10, 2018

Optical isotherms as a fundamental characterization method for gas sensing with luminescent MOFs by comparison of open and dense frameworks

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 (N2, Ar, CO2, and O2) 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[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[Zn0.9Mn0.1(Tz)2] retains the original structural microporosity. The obtained optical isotherms were further compared to results from a non-porous, luminescent coordination polymer 3[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.

Graphical abstract: Optical isotherms as a fundamental characterization method for gas sensing with luminescent MOFs by comparison of open and dense frameworks

Supplementary files

Article information

Article type
Paper
Submitted
02 Nov 2017
Accepted
06 Feb 2018
First published
06 Feb 2018

J. Mater. Chem. C, 2018,6, 2588-2595

Optical isotherms as a fundamental characterization method for gas sensing with luminescent MOFs by comparison of open and dense frameworks

F. Schönfeld, L. V. Meyer, F. Mühlbach, S. H. Zottnick and K. Müller-Buschbaum, J. Mater. Chem. C, 2018, 6, 2588 DOI: 10.1039/C7TC05002J

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