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Modulated Optoelectronic Properties of MOF/CNF Bionanocomposite Films for Bacterial Growth Control under Visible
Joab D Guerrero1, Raquel Martín-Sampedro2, Ramón Cuadrado1
1Instituto de Ciencia de Materiales de Madrid (ICMM, CSIC), C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain.
ACS Applied Materials & Interfaces
|May 10, 2025
Summary
Grafting aromatic molecules onto MIL-125-NH2 metal-organic frameworks (MOFs) enhanced their optoelectronic properties and mechanical strength when incorporated into cellulose nanofibers (CNF). These bionanocomposites showed significant photocatalytic antimicrobial activity against Staphylococcus aureus.
Area of Science:
- Materials Science
- Nanotechnology
- Photocatalysis
Background:
- Metal-organic frameworks (MOFs) like MIL-125-NH2 offer tunable properties for advanced applications.
- Postsynthetic modification is a key strategy to enhance MOF functionality.
- Cellulose nanofibers (CNF) provide a versatile platform for creating bionanocomposites.
Purpose of the Study:
- To investigate the tuning of optoelectronic properties of MIL-125-NH2 by grafting aromatic molecules.
- To develop novel CNF-based bionanocomposites incorporating pristine and modified MOFs.
- To evaluate the potential of these bionanocomposites for photocatalytic antimicrobial therapy.
Main Methods:
- Postsynthetic modification of MIL-125-NH2 with 3,4-dihydroxybenzaldehyde (DBA).
- Characterization of optoelectronic properties using UV-Vis spectroscopy and DFT calculations.
- Fabrication of CNF-based bionanocomposites with varying MOF loadings.
- Assessment of mechanical properties (Young's modulus).
- In vitro evaluation of photocatalytic antimicrobial activity against Staphylococcus aureus under visible light.
Main Results:
- DBA grafting reduced the bandgap of MIL-125-NH2 from 2.71 to 2.08 eV, enhancing visible light absorbance.
- DFT calculations supported the role of tautomerism in bandgap stabilization.
- CNF-MOF bionanocomposites exhibited significantly improved mechanical properties (Young's modulus increased from 1.3 to 7.5 GPa).
- Bionanocomposites demonstrated effective photocatalytic reduction of S. aureus, with inhibition rates of 58% (pristine MOF) and 72% (DBA-modified MOF) under visible light.
Conclusions:
- Postsynthetic modification with DBA effectively tunes the optoelectronic properties of MIL-125-NH2.
- CNF-based bionanocomposites show enhanced mechanical strength and photocatalytic antimicrobial efficacy.
- The developed materials show promise for applications in wound dressings and photocatalytic antimicrobial therapy.
