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Dielectric Properties and Electromagnetic Wave Absorbing Performance of Single-Source-Precursor Synthesized Mo4.8Si3C0.6/SiC/Cfree Nanocomposites with an In Situ Formed Nowotny Phase

Feng, Yao and Yang, Yujing and Wen, Qingbo and Riedel, Ralf and Yu, Zhaoju (2020):
Dielectric Properties and Electromagnetic Wave Absorbing Performance of Single-Source-Precursor Synthesized Mo4.8Si3C0.6/SiC/Cfree Nanocomposites with an In Situ Formed Nowotny Phase.
In: ACS Applied Materials & Interfaces, (14), 12. American Chemical Society, pp. 16912-16921, ISSN 1944-8244,
DOI: 10.1021/acsami.0c01277,
[Online-Edition: https://pubs.acs.org/doi/10.1021/acsami.0c01277],
[Article]

Abstract

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.

Item Type: Article
Erschienen: 2020
Creators: Feng, Yao and Yang, Yujing and Wen, Qingbo and Riedel, Ralf and Yu, Zhaoju
Title: Dielectric Properties and Electromagnetic Wave Absorbing Performance of Single-Source-Precursor Synthesized Mo4.8Si3C0.6/SiC/Cfree Nanocomposites with an In Situ Formed Nowotny Phase
Language: English
Abstract:

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.

Journal or Publication Title: ACS Applied Materials & Interfaces
Number: 14
Publisher: American Chemical Society
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 11 May 2020 05:35
DOI: 10.1021/acsami.0c01277
Official URL: https://pubs.acs.org/doi/10.1021/acsami.0c01277
Alternative keywords:
Alternative keywordsLanguage
Nowotny phase; polymer-derived ceramic (PDC); phase evolution; dielectric property; electromagnetic wave absorbing performance; multifunctional material MICROWAVE-ABSORPTION PROPERTIES; MULTIWALLED CARBON NANOTUBES; BEHAVIOR; MO-LESS-THAN-OR-EQUAL-TO-5SI3C-LESS-THAN-OR-EQUAL-TO-1; FILMS; SICN; FOAMUNSPECIFIED
Projects: China Scholarship Council, Grant Number 201606310021, Alexander von Humboldt Foundation, National Natural Science Foundation of China, Grant Number 51872246
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