Journal of Guangxi Normal University(Natural Science Edition) ›› 2023, Vol. 41 ›› Issue (5): 86-95.doi: 10.16088/j.issn.1001-6600.2022111401

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Thermal Stability and Dielectric Relaxation of MOF-2 Synthesized in Aqueous Phase

CHENG Lei1,2*, YAN Puxuan3, DU Bohao3, YE Si3, ZOU Huahong1,2   

  1. 1. School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin Guangxi 541004, China;
    2. Guangxi Key Laboratory of Low Carbon Energy Materials (Guangxi Normal University), Guilin Guangxi 541004, China;
    3. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin Guangxi 541004, China
  • Received:2022-11-14 Revised:2022-12-27 Published:2023-10-09

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Abstract: As ultra-low dielectric layer dielectric (ILD) materials, metal-organic frameworks (MOFs) show great application potential in the development of large-scale integrated circuit for high-end chips and other microelectronic devices. In this paper, MOF-2 with good crystallinity was prepared in the aqueous phase at room temperature and pressure, and the lattice parameters were analyzed by Rietveld refinement. Because of molecular structure rearrangement, the crystal structure of MOF-2 was changed into two desolvent products with [Zn(BDC)(DMF)] and [Zn(BDC)(H2O)] during thermal dehydration. After heating at 100 ℃ for 6 h, the phases of these two products were 89% and 11% respectively. The dielectric properties of the products were studied by using dielectric spectrum. It was found that the dielectric constant of MOF-2 prepared in aqueous phase changed greatly with frequency, and the relative dielectric constant was 4-5 above 1 MHz. The synergistic effect of water and DMF molecule had a major impact on the dielectric response of MOF-2 at mid and low frequency. The relative dielectric constant of the product no longer changes with the frequency after heating and remains at about 3.39 (0.1-1 MHz). After removing all solvent molecules, MOF-2 generates [Zn(BDC)] with sheet structure, and the relative dielectric constant is 3.91 (0.1-1 MHz). Based on the dielectric relaxation theory, the dielectric response of MOF-2 could be described by four relaxation mechanisms: dc conductivity in low frequency, synergistic polarization of water molecules and DMF in intermediate frequency, electron/ion displacement polarization in high frequency, and the universal dielectric response (UDR). This study clarified the structural characteristics, dielectric properties and polarization relaxation mechanism of MOF-2 synthesized in aqueous phase and its desolvent products, the result provided a theoretical basis for the application of MOF-2 in the electrical field.

Key words: MOF-2, crystal structure, dielectric property, thermal stability, polarized relaxation

CLC Number:  O641; O76
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