共 59 条
Ti3+ self-doped dark TiO2 nanoparticles with tunable and unique dielectric properties for electromagnetic applications
被引:41
作者:

Qing, Yuchang
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Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China

Li, Yang
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Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China

Li, Wei
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Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China

Yao, Haoyang
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Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China
机构:
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China
关键词:
MICROWAVE ABSORBING PROPERTIES;
ABSORPTION;
PERFORMANCE;
LIGHTWEIGHT;
COMPOSITES;
AEROGEL;
NANOCOMPOSITES;
CONDUCTIVITY;
DIANHYDRIDE;
POLYIMIDES;
D O I:
10.1039/d0tc05112h
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
Robust, conductive and stable Ti3+ self-doped dark TiO2 nanoparticles (Ti4O7) called Magneli phases are attractive in electromagnetic (EM) applications due to their tunable dielectric properties. Herein, Ti4O7 ceramic nanoparticles were successfully synthesized through a solvothermal and annealing method. To the best of our knowledge, this is the first time the dielectric and microwave absorption properties of Ti4O7 nanoparticles have been investigated in the field of EM applications, and Ti4O7 was evenly dispersed into polyimide (PI) by a heat pressing process. Interestingly, due to the formation of Ti3+ and oxygen vacancies during the annealing process, the special crystal structure will form electron channels that promote dark TN nanoparticles to possess a higher electrical conductivity and show outstanding dielectric loss compared to pristine TiO2 powders, endowing the 60 wt% Ti4O7/PI hybrid with an exceptional RL reaching -49.3 dB of 13.7 GHz at 1.25 mm thickness. These consequences indicate that highly conductive dark Ti4O7 composites will be good candidates for designing absorbers and other EM applications.
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页码:1205 / 1214
页数:10
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