Details

Autor(en) / Beteiligte

• Cui, Xiaoqing
• Liang, Xiaohui
• Liu, Wei
• Gu, Weihua
• Ji, Guangbin
• Du, Youwei

Titel

Stable microwave absorber derived from 1D customized heterogeneous structures of Fe3N@C

Ist Teil von

• Chemical engineering journal (Lausanne, Switzerland : 1996), 2020-02, Vol.381, p.122589, Article 122589

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• With the composition designing as well as structure optimizing, 1D customized heterogeneous structure of Fe3N@C shows stable and excellent microwave response. [Display omitted] •A stable Fe3N@C absorbent derived from 1D structures can be facially obtained by the organic amine nitriding process.•The strong covalent bonds and outer carbon may be responsible for the stable absorptivity.•RLmin value of −52.9 dB and fE value of 5.92 GHz can be achieved after 3 months of exposure to air.•Multiple attenuation of this customized heterogeneous structures enhanced microwave absorption. Synthetic customized heterostructure via optimizing structure as well as designing components is considered as an effective strategy to endow materials with specific functional applications. Here, we reported a facile and green process to obtain one dimensional (1D) Fe3N@C heterogeneous structures by using organic amines as nitrogen and carbon sources. Multiple processes including nitridation, formation of Fe3N nanoparticles and encapsulation of the produced Fe3N nanoparticles are simultaneously achieved. It is well known that microwave absorbers with stability and excellent performance are very important for the practical application. In this work, the as-prepared Fe3N@C composites can maintain excellent microwave absorbing performance when the samples are exposed to the open air for 3 months. Wide effective absorption bandwidths and strong absorption can be gained with the thickness less than 2 mm. In particular, an effective absorption bandwidth as wide as 5.92 GHz was obtained with thickness of 1.8 mm. Furthermore, the vector network analyzer (VNA) tests after 9 months of exposure to air provide more favorable evidence for its excellent and stable absorbing properties. The strong stability should be attributed to the covalent bonds after nitriding and the air-barrier provided by the outer carbon base. This study may provide new insights into the design and development of high-performance electromagnetic wave absorbers with excellent stability.