Zhang, Yuyu ; Sun, Jia ; Wang, Yuqi ; Riedel, Ralf ; Fu, Qiangang (2023)
SiCN ceramics with controllable carbon nanomaterials for electromagnetic absorption performance.
In: Journal of the American Ceramic Society, 106 (7)
doi: 10.1111/jace.19063
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Different kinds of carbon nanomaterials, free carbon (C-free), graphene, and N-containing graphene (NG), in single-source-precursors-derived SiCN ceramics, were in situ generated by modifying polysilazane with divinylbenzene, dopamine hydrochloride and melamine, respectively. Adjusting the carbon source brings phase structure and electromagnetic wave absorption (EMA) properties differences of SiCN/C ceramics. In situ C-free enhances the EMA capacity of SiCN ceramics by improving their electrical conductivity of 9.2 x 10(-4) S/cm. The electrical conductivity of SiCN ceramics with 2D graphene sheets balloons to 2.5 x 10(-3) S/cm, causing poor impedance match thus leading to a worse EMA performance. In situ NG in SiCN ceramics has a low electrical conductivity of 5.6 x 10(-8) S/cm, making for excellent impedance match. The corrugated NG boosts dielectric loss, interfacial, and dipole polarization. NG-SiCN nanocomposites possess an outstanding EMA performance with RLmin of -61.08 dB and effective absorption bandwidth of 4.05 GHz, which are similar to 2.4 times lower and similar to 4 times higher than those of SiCN, respectively.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Zhang, Yuyu ; Sun, Jia ; Wang, Yuqi ; Riedel, Ralf ; Fu, Qiangang |
| Art des Eintrags: | Bibliographie |
| Titel: | SiCN ceramics with controllable carbon nanomaterials for electromagnetic absorption performance |
| Sprache: | Englisch |
| Publikationsjahr: | Juli 2023 |
| Verlag: | Wiley |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 106 |
| (Heft-)Nummer: | 7 |
| DOI: | 10.1111/jace.19063 |
| Kurzbeschreibung (Abstract): | Different kinds of carbon nanomaterials, free carbon (C-free), graphene, and N-containing graphene (NG), in single-source-precursors-derived SiCN ceramics, were in situ generated by modifying polysilazane with divinylbenzene, dopamine hydrochloride and melamine, respectively. Adjusting the carbon source brings phase structure and electromagnetic wave absorption (EMA) properties differences of SiCN/C ceramics. In situ C-free enhances the EMA capacity of SiCN ceramics by improving their electrical conductivity of 9.2 x 10(-4) S/cm. The electrical conductivity of SiCN ceramics with 2D graphene sheets balloons to 2.5 x 10(-3) S/cm, causing poor impedance match thus leading to a worse EMA performance. In situ NG in SiCN ceramics has a low electrical conductivity of 5.6 x 10(-8) S/cm, making for excellent impedance match. The corrugated NG boosts dielectric loss, interfacial, and dipole polarization. NG-SiCN nanocomposites possess an outstanding EMA performance with RLmin of -61.08 dB and effective absorption bandwidth of 4.05 GHz, which are similar to 2.4 times lower and similar to 4 times higher than those of SiCN, respectively. |
| Freie Schlagworte: | carbon, electromagnetic properties, graphene, silicon carbonitride, polymer, composites |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 16 Mai 2023 05:52 |
| Letzte Änderung: | 16 Mai 2023 05:52 |
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