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Zeolitic imidazole framework-67/poly(vinyl alcohol) nanocomposites: Synthesis, morphological, thermal and optical properties
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DOI：10.1016/j.mseb.2026.119485.png)
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Abstract
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Metal-organic frameworks (MOFs) possess unique structural attributes ideal for advanced optical applications. This study reports the synthesis of Zeolitic Imidazole Framework-67 (ZIF-67) nanoparticles (ZNPs) and their incorporation into Poly(vinyl alcohol) (PVA) matrix to prepare ZIF-67/PVA polymer nanocomposites (ZPC). The materials were comprehensively characterised to elucidate their structure-property correlations. X-Ray Diffraction (XRD) and Rietveld refinement confirmed the crystal structure of ZNPs, crystallising in the cubic noncentrosymmetric space group responsible for their nonlinear optical behaviour. Fourier Transform Infrared (FTIR) and Raman spectroscopy analysed the prominence of chemical coordination of Co-N and -OH backbone of PVA matrix. High Resolution Transmission Electron Microscopy (HR-TEM) revealed rhombic dodecahedron ZNPs with particle size in the range of 120 nm, validated by Selected Area Electron Diffraction (SAED) and Energy Dispersive X-ray (EDX). Scanning Electron Microscopy (SEM) confirmed the excellent dispersion of ZNPs within the PVA matrix. Furthermore, contact angle, Differential Scanning Calorimetry (DSC), and Atomic Force Microscopy (AFM) highlighted distinct changes in surface wettability, thermal stability, and roughness. Optically, ZPCs exhibited significant UV-B absorption, suggesting utility in protective coatings. Increasing ZNPs concentration enhanced photophysical properties, decreasing the indirect bandgap from 5.1 to 4.3 eV. An increase in nonlinear optical metrics, including nonlinear refractive index, linear and nonlinear susceptibility, suggests a strong interaction between ZNPs and the PVA matrix. Photoluminescence studies (excitation at 375 nm) revealed a violet-to-blue shift in emission, confirmed by CIE chromaticity plots. These findings position ZPCs as suitable materials for tailoring photophysical properties in the next-generation optoelectronic devices.
Keywords:
ZIF-67
PVA
Optical properties
Energy bandgap
Nonlinear optics
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