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<p>Cellulose-modified zeolitic imidazolate framework, denoted as CEL-67, is developed as a sustainable, multifunctional material that integrates low-permittivity dielectric behaviour with carbon dioxide capture within a single platform. Structural integrity of ZIF-67 is preserved upon cellulose functionalization, while hydroxy-rich insulating interfaces suppress interfacial polarisation. Comprehensive structural, surface, and physicochemical characterization using FTIR, UV–visible spectroscopy, TG/DTG, PXRD, BET, XPS, SEM, and photoluminescence spectroscopy confirms the successful formation of the composite without structural degradation. CEL-67 exhibits a CO<sub>2</sub> uptake of ~ 0.76&#xa0;mmol&#xa0;g<sup>−1</sup> at 298&#xa0;K and 1&#xa0;bar and ~ 0.80&#xa0;mmol&#xa0;g<sup>−1</sup> at 273&#xa0;K, comparable to pristine ZIF-67 despite the surface area. Broadband dielectric performed over 1&#xa0;Hz–10<sup>6</sup>&#xa0;Hz reveals a pronounced reduction in dielectric constant, dielectric loss, and loss tangent for CEL-67, particularly in the low-frequency regime. Electric modulus and conductivity analyses further demonstrate that dielectric relaxation in CEL-67 is governed by interfacial (Maxwell–Wagner–Sillars) polarization, resulting in enhanced dielectric stability and reduced energy dissipation. This study is presented as a proof-of-concept demonstrating how cellulose functionalization can balance dielectric stability and gas accessibility within a single MOF-based composite.</p> Graphical abstract <p></p>

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Cellulose-functionalized ZIF-67 framework for sustainable low permittivity dielectrics and CO2 capture applications

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • A. Harisankar,
  • Sandhya Suresh,
  • M. Maneesha,
  • P. C. Preethi,
  • T. G. Sreeja,
  • P. Rejani,
  • V. T. Kavitha,
  • C. V. Suneesh,
  • Resmi Raghunandan

摘要

Cellulose-modified zeolitic imidazolate framework, denoted as CEL-67, is developed as a sustainable, multifunctional material that integrates low-permittivity dielectric behaviour with carbon dioxide capture within a single platform. Structural integrity of ZIF-67 is preserved upon cellulose functionalization, while hydroxy-rich insulating interfaces suppress interfacial polarisation. Comprehensive structural, surface, and physicochemical characterization using FTIR, UV–visible spectroscopy, TG/DTG, PXRD, BET, XPS, SEM, and photoluminescence spectroscopy confirms the successful formation of the composite without structural degradation. CEL-67 exhibits a CO2 uptake of ~ 0.76 mmol g−1 at 298 K and 1 bar and ~ 0.80 mmol g−1 at 273 K, comparable to pristine ZIF-67 despite the surface area. Broadband dielectric performed over 1 Hz–106 Hz reveals a pronounced reduction in dielectric constant, dielectric loss, and loss tangent for CEL-67, particularly in the low-frequency regime. Electric modulus and conductivity analyses further demonstrate that dielectric relaxation in CEL-67 is governed by interfacial (Maxwell–Wagner–Sillars) polarization, resulting in enhanced dielectric stability and reduced energy dissipation. This study is presented as a proof-of-concept demonstrating how cellulose functionalization can balance dielectric stability and gas accessibility within a single MOF-based composite.

Graphical abstract