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Boosted microwave absorption performance of transition metal doped tin fibers at elevated temperature

Nano Research 2023年第2期16卷 3570-3579页

作者： Cuiping Li Dan Li Lu Zhang Yahong Zhang Lei Zhang Chunhong Gong Jingwei Zhang Institute of Functional Polymer Composites College of Chemistry and Chemical EngineeringHenan UniversityKaifeng 475004China National&Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials Henan UniversityKaifeng 475004China Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano MaterialsCollege of Chemical and Materials EngineeringXuchang UniversityXuchang 461000China

Due to the temperature and frequency response of electromagnetic(EM)loss,how to realize the effective design of microwave absorption materials(MWAMs)at elevated temperature is highly desirable for practical applications.Herein,transition metaldoped titanium nitride(M-tin,M=Fe or Co)fibers were fabricated,the distortion of tin lattice could cause the adjustable charge enrichment,which played a profound influence on the dielectric response and EM microwave absorption(EMWA)performances.Benefiting from the negative correlation between dielectric loss and temperature,more loss mechanism could be introduced,which would effectively enhance dielectric loss and EMWA performances at elevated temperature.The optimal EMWA performances of Fe-tin fibers/polydimethylsiloxane(PDMS)composites were realized with a wide temperature range(298–423 K):the reflection loss(RL)could reach 99%(RLdoped-tin fibers/PDMS and Co-tin fibers/PDMS composites,the excellent EMWA of Fe-tin fibers/PDMS composite could be attributed to the reasonably synergistic polarization loss and conduction loss.Based on systematic analysis of the variable-temperature EM parameters and EMWA performances,the optimization of EMWA performances in wide temperature domain could be realized by introducing appropriate polarization loss and its compensating.Hopefully,this work provides a new strategy for regulating the dielectric response and designing effective MWAMs at elevated temperature.

关键词： transition metal-doped tin polarization loss dielectric response electromagnetic microwave absorption

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