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. 2024 Feb 20;14(5):388.
doi: 10.3390/nano14050388.

Unveiling the MIL-53(Al) MOF: Tuning Photoluminescence and Structural Properties via Volatile Organic Compounds Interactions

Tanzeel Ul Rehman  1 , Simonpietro Agnello  1 , Franco Mario Gelardi  1 , Martina Maria Calvino  1 , Giuseppe Lazzara  1 , Gianpiero Buscarino  1 , Marco Cannas  1
Affiliations

Unveiling the MIL-53(Al) MOF: Tuning Photoluminescence and Structural Properties via Volatile Organic Compounds Interactions

Tanzeel Ul Rehman et al. Nanomaterials (Basel). .

Abstract

MIL-53(Al) is a metal-organic framework (MOF) with unique properties, including structural flexibility, thermal stability, and luminescence. Its ability to adsorb volatile organic compounds (VOCs) and water vapor makes it a promising platform for sensing applications. This study investigated the adsorption mechanism of MIL-53(Al) with different VOCs, including ketones, alcohols, aromatics, and water molecules, focusing on structural transformations due to pore size variation and photoluminescence properties. The reported results assess MIL-53(Al) selectivity towards different VOCs and provide insights into their fundamental properties and potential applications in sensing.

Keywords: MIL-53(Al); Metal-Organic Frameworks; VOCs; guest-adsorption; photoluminescence; structural transitions.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
PXRD patterns of MIL-53(Al)/activated and MIL-53(Al)/hydrated (A); PXRD patterns of MIL-53(Al)/VOCs with the dashed lines representing the positions of the peaks associated with the three possible structures of MIL-53(Al) (B). Zoomed view of PXRD patterns of MIL-53(Al)/activated and MIL-53(Al)/hydrated (C). Zoomed view of PXRD patterns of MIL-53(Al)/VOCs comparison with MIL-53(Al)/activated (D).
Figure 2
Figure 2
TGA analysis of free BDC linkers and MIL-53(Al)/activated and hydrated (A), MIL-53(Al)/methanol/acetone and toluene (B) and MIL-53(Al)/ethanol and isopropanol (C).
Figure 3
Figure 3
Comparison of FT-Raman spectrum acquired in MIL-53(Al)/activated with MIL-53(Al)/hydrated (A), MIL-53(Al)/toluene (B), MIL-53(Al)/acetone (C) MIL-53(Al)/isopropanol (D), MIL-53(Al)/methanol (E) and MIL-53(Al)/ethanol (F).
Figure 4
Figure 4
Zoomed view of FT-Raman spectra related to breathing properties of MIL-53(Al)/activated and MIL-53(Al)/VOCs.
Figure 5
Figure 5
Comparison between photoluminescence (PL) emission spectra of MIL-53(Al)/activated and hydrated (A). Emission spectra of MIL-53(Al)/activated and VOCs (B). Normalized photoluminescence (PL) spectra of MIL-53(Al)/activated and VOCs to evidence the guest-induced spectral shifts of emission maxima (C). Decay curves recorded on the photoluminescence (PL) peaks in MIL-53(Al)/activated and VOCs (D). Both emission spectra and decay curves are excited at 305 nm.
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