Authors
Ying Xue, Zhuo Wang, Xiaobin Zhou, Linyin Huang, Min Chen, Amei Zhang, Hongping Hou, Hongliang Du
Published in
Physical chemistry chemical physics : PCCP. Jul 10, 2026. Epub Jul 10, 2026.
Abstract
Advanced microwave absorption materials have significant application value in electromagnetic pollution protection and military stealth technology. Traditional rutile TiO2 has limited loss capacity in the microwave frequency range and is used as an impedance matching component. In this study, a nitrogen (N)-doped TiO2 material with controllable point defects was successfully prepared through a sol-gel method. Experimental results show that the N doping strategy can effectively regulate the complex dielectric constant and microwave absorption performance of the materials. When the N/Ti molar ratio is 1.7, at a 2.0 mm matching thickness, a minimum reflection loss (RLmin) of -37.5 dB was obtained, and an effective absorption bandwidth (EAB, RL < -10 dB) of 3.4 GHz was achieved. Through characterization methods including electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS), it was confirmed that the regulating concentration of oxygen vacancies induced by N doping and the composite defects as strong polarization centers significantly enhanced the defect dipole polarization. This study not only provides a new approach for optimizing the intrinsic microwave absorption performance of rutile TiO2 at the lattice level through point defect engineering but also expands the application potential in the microwave absorption field.
PMID:
42429098
Bibliographic data and abstract were imported from PubMed on 10 Jul 2026.
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