Silica-coated iron nanocubes: Preparation, characterization and application in microwave absorption

被引：51

作者：

Ni, Xiaomin ^{[1
]}

Zheng, Zhong ^{[2
]}

Hu, Xiang ^{[2
]}

Xiao, Xiukun ^{[1
]}

机构：

[1] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Dept Elect Sci & Technol, Hefei 230027, Anhui, Peoples R China

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2010年 / 341卷 / 01期

关键词：

Nanocubes; Iron; Silica coating; Microwave absorption; Magnetization; NANOPARTICLES; PARTICLES; METALS; MICROSTRUCTURE; PERMEABILITY; OXIDATION;

D O I：

10.1016/j.jcis.2009.09.017

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Novel Cubic nanocapsules consisting of metallic iron core and amorphous Silica shell were fabricated through a simple chemical reduction route followed by a Stober process. Thus-prepared Fe@SiO2 nanocubes were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectrometer (XPS), Fourier transform infrared spectrometer (FTIR), thermogravimetry-differential thermal analysis (TG-DTA), vibrating sample magnetometer (VSM) and scalar network analysis (SNA). Comparing with that of pure iron counterparts, silica-coated iron nanocubes exhibited improved magnetic properties, oxidation resistance and microwave absorption performance. A reflection loss (RI,) exceeding - 12 dB was obtained in the frequency range of 8-14 GHz for an absorber thickness of 2 mm, with an optimal RL of -18.2 dB at 9 GHz. Mechanism of the improved microwave absorption properties of the Fe@SiO2 composite was discussed based on their magnetic properties and electromagnetic theory. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：18 / 22

页数：5

共 37 条

[1] Fabrication of Iron Nanowire Arrays by Electrodeposition into Porous Alumina [J].

Borissov, Dimitar ;

Isik-Uppenkamp, Sonnur ;

Rohwerder, Michael .

JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (08) :3133-3138

[2] Microwave absorption enhancement and complex permittivity and permeability of Fe encapsulated within carbon nanotubes [J].

Che, RC ;

Peng, LM ;

Duan, XF ;

Chen, Q ;

Liang, XL .

ADVANCED MATERIALS, 2004, 16 (05) :401-+

[3] Electron energy-loss spectroscopy characterization and microwave absorption of iron-filled carbon-nitrogen nanotubes [J].

Che, Renchao ;

Liang, Chongyun ;

Shi, Honglong ;

Zhou, Xingui ;

Yang, Xinan .

NANOTECHNOLOGY, 2007, 18 (35)

[4] ENHANCED MAGNETIZATION OF NANOSCALE COLLOIDAL COBALT PARTICLES [J].

CHEN, JP ;

SORENSEN, CM ;

KLABUNDE, KJ ;

HADJIPANAYIS, GC .

PHYSICAL REVIEW B, 1995, 51 (17) :11527-11532

[5] Preparation of Fe (core)/SiO2 (shell) composite particles with improved oxidation-resistance [J].

Cheng, Jing ;

Ni, Xiaomin ;

Zheng, Huagui ;

Li, Beibei ;

Zhang, Xiaojun ;

Zhang, Dongen .

MATERIALS RESEARCH BULLETIN, 2006, 41 (08) :1424-1429

[6] Silicon dioxide coating of CeO2 nanoparticles by solid state reaction at room temperature [J].

Cui, HT ;

Hong, GY ;

Wu, XY ;

Hong, YJ .

MATERIALS RESEARCH BULLETIN, 2002, 37 (13) :2155-2163

[7] Superlattices of iron nanocubes synthesized from Fe[N(SiMe3)2]2 [J].

Dumestre, F ;

Chaudret, B ;

Amiens, C ;

Renaud, P ;

Fejes, P .

SCIENCE, 2004, 303 (5659) :821-823

[8] Highly magnetic silica-coated iron nanoparticles prepared by the arc-discharge method [J].

Fernández-Pacheco, R ;

Arruebo, M ;

Marquina, C ;

Ibarra, MR ;

Arbiol, J ;

Santamaría, J .

NANOTECHNOLOGY, 2006, 17 (05) :1188-1192

[9] BOROHYDRIDE REDUCTIONS OF METAL-IONS - A NEW UNDERSTANDING OF THE CHEMISTRY LEADING TO NANOSCALE PARTICLES OF METALS, BORIDES, AND METAL BORATES [J].

GLAVEE, GN ;

KLABUNDE, KJ ;

SORENSEN, CM ;

HADJAPANAYIS, GC .

LANGMUIR, 1992, 8 (03) :771-773

[10] Microwave-absorption properties of Fe(Mn)/ferrite nanocapsules [J].

Han, Zheng ;

Li, Da ;

Liu, Xianguo ;

Geng, Dianyu ;

Li, Ji ;

Zhang, Zhidong .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2009, 42 (05)

← 1 2 3 4 →