(687c) Insight on Fluorinated MOFs Structural Properties-Gas/Vapor Adsorption/Sensing Relationships

Insight on Fluorinated MOFs structural
properties-gas/vapor adsorption/sensing relationships 

Mohamed Rachid Tchalala, Youssef Belmabkhout, Karim Adil,
Prashant. M. Bhatt, Karumbaiah Nanaiah, Khaled Nabil Salama, Mohamed Eddaoudi

Functional
Materials Design, Discovery & Development (FMD3), Advanced Membranes and
Porous Materials Center, Division of Physical
Sciences and Engineering, King Abdullah University of Science and Technology,
4700 King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia.

The understanding of gas/vapor sorption properties
of materials in relation to their applications in separation, catalysis and
sensing in extremely important to achieve intensified processes. In this paper,
we report very recent advances on the use of MOF thin films as a medium for
detecting gases/vapors, with respect to their concentration toxicity range or
uncomforting zones. We show for the first time a set of rarely unveiled MOF
structural properties-gas/vapor adsorption /sensing relationships study, that
allowed unveiling a very sensitive MOF based sensors for CO₂, H₂S,
H₂O and SO₂. In particular, the recent discovery of
ultra-microporous fluorinated MOF with adjustable inorganic pillars, allowed unveiling
powerful MOF sensors capable of detecting gases in the presence of atmospheric
moisture.  For, illustration purpose,
this talk will focus on the exceptional concurrent selective sensing of CO₂
and H₂O (Figure 1) from atmospheric air. The effect of transduction
mechanism (QCM or IDE) will be also discussed.

Figure 1: Variation in the
capacitance with RH change in a) NbOFFIVE-1-Ni and b) AlFFIVE-1-Ni. Frequency
shift as function of RH for QCM coated with c) NbOFFIVE-1-Ni and d)
AlFFIVE-1-Ni