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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Synthesis of lightweight N-doped graphene foams with open reticular structure for high-efficiency electromagnetic wave absorption
TL;DR: In this paper, an N-doped graphene foams with high porosity and open reticular structures are prepared via a self-assembled hydrothermal reaction and a freeze-drying process.
Journal ArticleDOI
Multifunctional Organic–Inorganic Hybrid Aerogel for Self‐Cleaning, Heat‐Insulating, and Highly Efficient Microwave Absorbing Material
Journal ArticleDOI
Defect Engineering in Two Common Types of Dielectric Materials for Electromagnetic Absorption Applications
Bin Quan,Bin Quan,Wenhao Shi,Samuel Jun Hoong Ong,Xiaochi Lu,Paul Luyuan Wang,Guangbin Ji,Yufeng Guo,Lirong Zheng,Zhichuan J. Xu +9 more
TL;DR: In this paper, the NSFC (Grant Nos. 11575085, 51602154, 11472131, and 11622218), the Aeronautics Science Foundation of China (Grant No. 2017ZF52066), the Qing Lan Project, Six talent peaks project in Jiangsu Province (Project No. XCL-035), the Jiangsu NSF (BK20160037), the program of China Scholarships Council (Program No. 201806830013), Funding for Outstanding Doctoral Dissertation in NUAA (BCXJ
Journal ArticleDOI
Lightweight Ti2CTx MXene/Poly(vinyl alcohol) Composite Foams for Electromagnetic Wave Shielding with Absorption-Dominated Feature
TL;DR: Comparison experiment reveals that the good impedance matching derived from the multiple porous structures, internal reflection, and polarization effect plays a synergistic role in the improved absorption efficiency and superior EMI shielding performance.
Journal ArticleDOI
Electromagnetic interference shielding MWCNT-Fe3O4@Ag/epoxy nanocomposites with satisfactory thermal conductivity and high thermal stability
Lei Wang,Hua Qiu,Chaobo Liang,Ping Song,Yixin Han,Yixuan Han,Junwei Gu,Jie Kong,Duo Pan,Duo Pan,Zhanhu Guo +10 more
TL;DR: In this paper, hierarchical composite nanoparticles of multiwall carbon nanotube (MWCNT)-Fe3O4@Ag combining electrical conductivity and magnetism were obtained from acylamine reaction between carboxylation of Fe3O 4@Ag (Fe3OnAg-COOH) nanoparticles and amino functionalized MWCNTs.
References
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Journal ArticleDOI
Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
Xuesong Li,Weiwei Cai,Jinho An,Seyoung Kim,Junghyo Nah,Dongxing Yang,Richard D. Piner,Aruna Velamakanni,Inhwa Jung,Emanuel Tutuc,Sanjay K. Banerjee,Luigi Colombo,Rodney S. Ruoff +12 more
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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.