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

Abstract

Optical isotherms as novel fundamental characterization method for MOF (metal-organic framework) sensors are presented by combination of simultaneous monitoring of sorption processes of different analyte gases (N2, Ar, CO2, O2) together with in-situ photoluminescence spectroscopy. Thereby, direct correlation of both properties, luminescence and adsorption, is achieved, which provides 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 as well as 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 porous model candidate. 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 luminescence activator. Statistic replacement of Zn2+ with Mn2+ in 3[Zn0.9Mn0.1(Tz)2], which 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 for 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.

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Publication details

The article was received on 02 Nov 2017, accepted on 06 Feb 2018 and first published on 06 Feb 2018


Article type: Paper
DOI: 10.1039/C7TC05002J
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Optical isotherms as fundamental characterization method for gas sensing with luminescent MOFs in comparison of open and dense frameworks

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

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