Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 14, Pages 16912-16921Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c01277
Keywords
Nowotny phase; polymer-derived ceramic (PDC); phase evolution; dielectric property; electromagnetic wave absorbing performance; multifunctional material
Funding
- China Scholarship Council (CSC) [201606310021]
- Alexander von Humboldt Foundation
- National Natural Science Foundation of China [51872246]
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For the first time, dielectric properties and electromagnetic wave (EMW) absorbing performance of single-source-precursor derived Mo4.8Si3C0.6/SiC/C-free ceramic nanocomposites with a highly electrically conductive intermetallic Nowotny phase (NP, i.e., Mo4.8Si3C0.6) are reported. High-temperature phase evolution of the nanocomposites reveals that free carbon (C-free) plays a crucial role in the in situ formation of the NP, indicating that the microstructure of the nanocomposites can be tailored via molecular design of the single-source precursors. Compared with SiC/C-free and MoSi2/SiC/C-free nanocomposites obtained under the same conditions, the Mo4.8Si3C0.6/SiC/C-free nanocomposites exhibit significantly enhanced EMW absorbing performance. A minimum reflection loss (RL) of -59 dB was achieved at 8 GHz for the thickness of 2.46 mm, proving the superiority of the Mo4.8Si3C0.6/SiC/C-free nanocomposite as an outstanding EMW absorbing material. On the basis of our previous discovery that the Mo4.8Si3C0.6 embedded in a SiC-based matrix with high specific surface area exhibits excellent electrocatalytic properties suitable for the electrochemical hydrogen evolution reaction, the present results prove that Mo4.8Si3C0.6/SiC/C-free nanocomposites have to be considered as novel multifunctional materials with tailorable microstructure and excellent performance in two different fields including electrochemical water splitting and EMW absorption.
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