Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 9, Pages 12046-12054Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b02350
Keywords
Hydrogenated TiO2; Microwave absorbing; Core-shell; Electromagnetic synergistic effects; Electromagnetic properties
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Funding
- National Basic Research Program of China (973 Program) [2009CB939705]
- Platform of Science and Technology and Talent Team Plan of Guizhou province [2017-5610]
- National Nature Science Foundation of China [1174227, 11364005, 11474151, 11774156, 11604060]
- National Science Foundation of Guizhou province [2014-2059]
- Chinese Universities Scientific Fund
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Owing to tremendous potential applications, hydrogenated TiO2 (H-TiO2) nanomaterial has been considered an important member in the field of microwave absorption. In this paper, a kind of core-shell structured microspheres (MPs) consisting of outer-shell hydrogenated anatase TiO2 (H-A-TiO2) and inner-core magnetic Ni MPs were prepared successfully using a simple method. Experimental results revealed the as-prepared hydrogenated anatase TiO2@Ni (H-A-TiO2@Ni) composite exhibited enhanced microwave absorption property, when compared to pristine anatase TiO2@Ni (A-TiO2@Ni). (1) The minimum reflection loss (RL) of the H-A-TiO2@Ni/wax composite reached -64.2 dB at a thickness of 2 mm, indicating a large absorption efficiency over 99.99%. (2) The H-A-TiO2@Ni showed an effective microwave absorption bandwidth (RL < -20 dB) in a range from 2.2 to 11 GHz. Due to the introduction of core-shell media, coating Ni microspheres with H-A-TiO2 shells not only will be beneficial for impedance matching behavior but also improve the electromagnetic synergistic effects. This study provides a new application area of hydrogenated TiO2 materials as an efficiency energy absorber and opens up a new pathway for design of efficient microwave-absorbing materials.
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