Investigation of the electromagnetic absorption properties of Ni@TiO<sub>2</sub> and Ni@SiO<sub>2</sub> composite microspheres with core–shell structure

Zhao, Biao; Shao, Gang; Fan, Bingbing; Zhao, Wanyu; Zhang, Rui

doi:10.1039/c4cp05031b

Cited by 282 publications

(160 citation statements)

References 61 publications

(74 reference statements)

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“…29 Besides, another novel hierarchical heterostructure, based on a Ni microsphere-CuO nano-rice core-shell composite, has also been synthesized by solvothermal method, and the optimal reection loss was À62.2 dB at 13.8 GHz with the thickness of 1.7 mm. 30 Evidently, taking into account of these reported results, it can be referred that CuO based composites be potential candidates with excellent microwave absorption capabilities.…”

Section: Introductionmentioning

confidence: 99%

Facile solvothermal synthesis of novel hetero-structured CoNi–CuO composites with excellent microwave absorption performance

Gao

Zhou

et al. 2017

RSC Adv.

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Hetero-structured functional materials with tailored composition that can provide excellent electromagnetic wave (EMW) absorption with minimal thickness are highly desirable, especially if they can be easily fabricated. Herein, novel hetero-structured CoNi-CuO composite microspheres were fabricated via a facile solvothermal process. The composites with adjusted mass ratios of CuO to CoNi alloy (5/1, 2.5/1 and 1.25/1) were facilely achieved by modulating the quantity of CuCl 2 $2H 2 O during the synthesis. It was demonstrated that the enhanced microwave absorption properties could be ascribed to the dielectric CuO, which can favorably increase the interface of the hetero-structure and the impedance matching with CoNi alloyed particles. It was shown that, when the molar ratio was 2.5 : 1, the typical CoNi-CuO composite microspheres presented a promising microwave absorption performance, namely a maximum reflection loss (RL) of À25.1 dB at 13.2 GHz with a thickness of only 2.5 mm, while the effective microwave absorption bandwidth (RL < À10) could reach 3.4 GHz (from 10.0 to 13.4 GHz). As is demonstrated, this kind of newly fabricated CoNi-CuO composite can be regarded as a promising candidate for high-performance microwave absorption materials.

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Section: Introductionmentioning

confidence: 99%

Facile solvothermal synthesis of novel hetero-structured CoNi–CuO composites with excellent microwave absorption performance

Gao

Zhou

et al. 2017

RSC Adv.

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“…Selain itu, TiO 2 juga mudah untuk distabilkan oleh oksida logam lain untuk memodifikasi sifat fisik, mekanik, dan kimianya. Berdasarkan pada sifat-sifat yang dimiliki oleh TiO 2 tersebut, maka bahan ini sangat menarik untuk dipelajari bila dikembangkan menjadi bahan penyerap gelombang elektromagnetik (microwave absorbing material) [2][3][4][5][6][7].…”

Section: Pendahuluanunclassified

“…Pada penelitian ini akan dilakukan modifikasi dan rekayasa struktur bahan TiO 2 Beberapa pengujian pada masing-masing sampel dilakukan untuk mengetahui karakteristik yang diperlukan sesuai dengan tujuan pada penelitian ini. Karakterisasi awal adalah identifikasi fasa dari masing-masing sampel menggunakan peralatan Difraktometer Sinar-X (XRD) merek Phillips Panalytical Empyrean PW1710.…”

Section: Pendahuluanunclassified

EFEK SUBSTITUSI Fe2+ DAN Fe3+ TERHADAP STRUKTUR KRISTAL, SIFAT OPTIK DAN MAGNETIK PADA NANOPARTIKEL ANATASE Ti1-d(d %Fe)O2

Adi

Fisli²

2018

JUSAMI

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Recently electromagnetic wave absorber materials are becoming a very interesting study to be studied more deeply because it is unique in terms of its interaction with electromagnetic waves itself. The main requirement to be met as an electromagnetic wave absorber material is that the material must have the characteristics of dielectric loss and magnetic loss are high. Anatase TiO 2 is a good dielectric material but these material is diamagnetic. Fe substitution was expected to manipulate the magnetic properties of this material. Modification of anatase TiO 2 was prepared by the precipitation method through the procedure as follows: 25 mL of iron salt solution containing 0.3M Fe 2+ and 0.3M Fe 3+ (mol ratio of 2: 1) respectively mixed into 50 mL of 3 M TiCl 4 . The mixture solution of titanium and iron was added to a 150 mL solution of 2.5 M ammonia with dropwise rate 3 ml/min. After that the precipitate was washed then heated in an oven and calcined at 500°C for 3 hours. There are two types of samples obtained namely anatase Ti 1- (%Fe 3+ ) dan Ti 1- (%Fe 2+ ) where  = 0, 0.5, 1, and 5 wt%). Phase identification was measured by X-ray diffraction and crystal structure was analyzed by using the Rietveld method. Refinement result indicates that the sample has tetragonal crystal structure a single phase of anatase TiO 2 . Fe atoms have been successfully substituted into Ti without changing the crystal structure of this material. While based on the results of the analysis of optical and magnetic properties showed that the substitution effect of both Fe 2+ and

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“…37 Nevertheless, if the permittivity is much higher than the permeability (shown in Fig. 7c and d), this will result in poor impedance matching.…”

Section: Electromagnetic-wave Absorption Propertiesmentioning

confidence: 99%

Significant promotion of porous architecture and magnetic Fe₃O₄ NPs inside honeycomb-like carbonaceous composites for enhanced microwave absorption

Gao

Xiao

et al. 2018

RSC Adv.

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Carbonaceous composites with tailored porous architectures and magnetic Fe 3 O 4 components derived from walnut shells were fabricated by a solvothermal method and used as effective microwave absorbers. The porous composites were obtained by two carbonization processes at different temperatures and an etching process using potassium hydroxide. The introduction of a developed porous architecture inside the resulting materials distinctly improved the microwave absorption performance. Moreover, investigations revealed that the Fe 3 O 4 nanoparticles were chemically bonded and uniformly decorated on the porous framework without aggregation. Owing to the combined advantages of the lightweight conductive biochar-like porous framework with a favorable dielectric loss and Fe 3 O 4 nanoparticles with magnetic loss features, these newly fabricated porous carbonaceous composites exhibited excellent microwave absorption performance. A reflection loss (RL) of À51.6 dB was achieved at a frequency of 13.6 GHz. Besides, the effective absorption (below À10 dB) bandwidth reached 5.8 GHz (from 11.9 to 17.7 GHz) at an absorber thickness of only 2 mm. These results indicated that this type of porous Fe 3 O 4 -biochar composite derived from biomass substances and prepared via an easy-to-handle process can be considered as attractive candidates for the design and manufacture of high-efficiency microwave-absorbing materials.

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Investigation of the electromagnetic absorption properties of Ni@TiO₂ and Ni@SiO₂ composite microspheres with core–shell structure

Cited by 282 publications

References 61 publications

Facile solvothermal synthesis of novel hetero-structured CoNi–CuO composites with excellent microwave absorption performance

Facile solvothermal synthesis of novel hetero-structured CoNi–CuO composites with excellent microwave absorption performance

EFEK SUBSTITUSI Fe2+ DAN Fe3+ TERHADAP STRUKTUR KRISTAL, SIFAT OPTIK DAN MAGNETIK PADA NANOPARTIKEL ANATASE Ti1-d(d %Fe)O2

Significant promotion of porous architecture and magnetic Fe₃O₄ NPs inside honeycomb-like carbonaceous composites for enhanced microwave absorption

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Investigation of the electromagnetic absorption properties of Ni@TiO2 and Ni@SiO2 composite microspheres with core–shell structure

Cited by 282 publications

References 61 publications

Facile solvothermal synthesis of novel hetero-structured CoNi–CuO composites with excellent microwave absorption performance

Facile solvothermal synthesis of novel hetero-structured CoNi–CuO composites with excellent microwave absorption performance

EFEK SUBSTITUSI Fe2+ DAN Fe3+ TERHADAP STRUKTUR KRISTAL, SIFAT OPTIK DAN MAGNETIK PADA NANOPARTIKEL ANATASE Ti1-d(d %Fe)O2

Significant promotion of porous architecture and magnetic Fe3O4 NPs inside honeycomb-like carbonaceous composites for enhanced microwave absorption

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Investigation of the electromagnetic absorption properties of Ni@TiO₂ and Ni@SiO₂ composite microspheres with core–shell structure

Significant promotion of porous architecture and magnetic Fe₃O₄ NPs inside honeycomb-like carbonaceous composites for enhanced microwave absorption