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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 ; Yang, Yujing ; Wen, Qingbo ; Riedel, Ralf ; 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, 12 (14)
doi: 10.1021/acsami.0c01277
Article, Bibliographie

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 ; Yang, Yujing ; Wen, Qingbo ; Riedel, Ralf ; Yu, Zhaoju
Type of entry: Bibliographie
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
Date: 8 April 2020
Publisher: American Chemical Society
Journal or Publication Title: ACS Applied Materials & Interfaces
Volume of the journal: 12
Issue Number: 14
DOI: 10.1021/acsami.0c01277
URL / URN: https://pubs.acs.org/doi/10.1021/acsami.0c01277
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.

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
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
Last Modified: 11 May 2020 05:35
PPN:
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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