Defect Dipole-Induced HfO2-Coated Ti3C2Tx MXene/Nickel Ferrite Nanocomposites for Enhanced Microwave Absorption

Salim Hassan Siddiki*, Kartikey Verma, Bhaswati Chakraborty, Sushrut Das, Vijay Kumar Thakur, Ganesh Chandra Nayak*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


This work reports for the first time the synthesis of a HfO2-coated Ti3C2Tx MXene sandwich-like nanostructure (MXHf) using a simple hydrothermal method and their excellent microwave absorption property in combination with nickel ferrite and epoxy matrix. The nanocomposites of 2, 3, and 4 mm thick samples were tested for microwave absorption in the X-band, and a minimum reflection loss (RLmin) of −20.9 dB with EAB (effective absorption bandwidth) of 2.32 GHz was achieved for the 3 mm thick sample. Its superior performance results from the strong dielectric polarization of defect dipole in the MXene structure, the high number of oxygen vacancies brought about by HfO2 nanoparticles, rich micro-interfaces in the sandwich-like HfO2-Ti3C2Tx-HfO2 structure, and impedance matching by NiFe2O4. A probable mechanism of absorption is proposed. Hence, HfO2/Ti3C2Tx/NiFe2O4 nanocomposites possess essential properties for real-time application in the defense and telecommunication industries.

Original languageEnglish
Pages (from-to)1839-1848
Number of pages10
JournalACS Applied Nano Materials
Issue number3
Early online date30 Jan 2023
Publication statusPrint publication - 10 Feb 2023

Bibliographical note

Funding Information:
The authors would like to thank the Defense Research & Development Organization, New Delhi (project no. ERIP/ER/1302233/M/01/632) for financial support and the Department of Chemistry & Chemical Biology and the Department of Electronics Engineering of IIT (ISM) Dhanbad for providing the necessary research resources. For PNA analysis, the authors also would like to thank Mr. Sourabh Santosh and Mrs. Priya Kumari from the Electronics Engineering Department of IIT (ISM) Dhanbad.

Publisher Copyright:
© 2023 American Chemical Society.


  • hafnium oxide
  • MAX phase
  • MXene
  • nickel ferrite
  • microwave absorbing material


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