Journal ArticleDOI
Direct Growth of Edge-Rich Graphene with Tunable Dielectric Properties in Porous Si3N4 Ceramic for Broadband High-Performance Microwave Absorption
Fang Ye,Qiang Song,Zhang Zhenchuang,Wei Li,Shouyang Zhang,Xiaowei Yin,Yuzhao Zhou,Huiwen Tao,Yongsheng Liu,Laifei Cheng,Litong Zhang,Hejun Li +11 more
TLDR
In this paper, a simple chemical vapor deposition (CVD) route for the direct growth of edge-rich graphene (ERG) with tailored structures and tunable dielectric properties in porous Si3N4 ceramics using only methyl alcohol (CH3OH) as precursor is reported.Abstract:
High-performance graphene microwave absorption materials are highly desirable in daily life and some extreme situations. A simple technique for the direct growth of graphene as absorption fillers in wave-transmitting matrices is of paramount importance to bring it to real-world application. Herein, a simple chemical vapor deposition (CVD) route for the direct growth of edge-rich graphene (ERG) with tailored structures and tunable dielectric properties in porous Si3N4 ceramics using only methyl alcohol (CH3OH) as precursor is reported. The large O/C atomic ratio of CH3OH helps to build a mild oxidizing atmosphere and leads to a unique structure featuring open graphite nanosteps and freestanding nanoplanes, endowing the ERG/Si3N4 hybrid with an appropriate balance between good impedance matching and strong loss capacity. Accordingly, the prepared materials exhibit superior electromagnetic wave absorption, far surpassing that of traditional CVD graphene and reduced graphene oxide-based materials, achieving an effective absorption bandwidth of 4.2 GHz covering the entire X band, with a thickness of 3.75 mm and a negligibly low loading content of absorbents. The results provide new insights for developing novel microwave absorption materials with strong reflection loss and wide absorption frequency range.read more
Citations
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Digital light processing 3D printing of graphene/carbonyl iron/polymethyl methacrylate nanocomposites for efficient microwave absorption
TL;DR: In this article, the authors used 3D printing technology to enhance the microwave absorption performance of absorbers from the material composition and structure design, and the newly prepared composites show enhanced microwave absorption properties.
Journal ArticleDOI
Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth
Haoran Cheng,Yamin Pan,Xin Wang,Chuntai Liu,Changyu Shen,Dirk W. Schubert,Zhanhu Guo,Xianhu Liu +7 more
TL;DR: In this article , the magnetized Ni flower/MXene hybrids are successfully assembled on the surface of melamine foam (MF) through electrostatic self-assembly and dip-coating adsorption process, realizing the integration of microwave absorption, infrared stealth and flame retardant.
Journal ArticleDOI
Balancing interface polarization strategy for enhancing electromagnetic wave absorption of carbon materials
Yan Xu,Xiaoxiao Huang,Bo Zhong,Tong Wu,Huatao Wang,Tao Zhang,Namuersaihan Bai,Guopeng Zhou,Hong Pan,Guangwu Wen,Long Xia +10 more
TL;DR: In this article, a novel strategy of constructing interfacial hierarchical structure is reported to unveil such basic relationship, and the melamine carbonized sponge (MCS) composites were successfully synthesized under the assistance of trace amounts of nickel metal catalysis.
Journal ArticleDOI
High‐temperature electromagnetic wave absorption properties of Cf/SiCNFs/Si3N4 composites
Journal ArticleDOI
Single Zinc Atoms Anchored on MOF-Derived N-Doped Carbon Shell Cooperated with Magnetic Core as an Ultrawideband Microwave Absorber.
TL;DR: In this paper, a single atom-doping strategy is established to adjust local electric potential in the metal-organic framework (MOF)-derived carbon shell using ZIF-8 as a template.
References
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Journal ArticleDOI
Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
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Raman Spectrum of Graphite
F. Tuinstra,J. L. Koenig +1 more
TL;DR: Raman spectra are reported from single crystals of graphite and other graphite materials as mentioned in this paper, and the Raman intensity of this band is inversely proportional to the crystallite size and is caused by a breakdown of the k-selection rule.
Journal ArticleDOI
Large Area, Few-Layer Graphene Films on Arbitrary Substrates by Chemical Vapor Deposition
Alfonso Reina,Xiaoting Jia,John T. Ho,Daniel Nezich,Hyungbin Son,Vladimir Bulovic,Mildred S. Dresselhaus,Jing Kong +7 more
TL;DR: The transparency, conductivity, and ambipolar transfer characteristics of the films suggest their potential as another materials candidate for electronics and opto-electronic applications.
Journal ArticleDOI
Electromagnetic interference shielding with 2D transition metal carbides (MXenes)
Faisal Shahzad,Mohamed Alhabeb,Christine B. Hatter,Babak Anasori,Soon Man Hong,Chong Min Koo,Yury Gogotsi +6 more
TL;DR: The mechanical flexibility and easy coating capability offered by MXenes and their composites enable them to shield surfaces of any shape while providing high EMI shielding efficiency.
Journal ArticleDOI
First- and second-order Raman scattering from finite-size crystals of graphite
TL;DR: In this article, the second-order Raman spectrum of pyrolytic graphite has been studied and the dependence of the first-order graphite Raman spectra on crystallite size has been shown.