Thermal, dielectric and microwave absorption properties of polyaniline-CoFe2O4 nanocomposites

被引：167
作者：
Gandhi, Namita [1 ]
Singh, Kuldeep [1 ]
Ohlan, Anil [2 ]
Singh, D. P. [3 ]
Dhawan, S. K. [1 ]
机构：
[1] Natl Phys Lab CSIR, Polymer & Soft Mat Sect, New Delhi 110012, India
[2] Maharshi Dayanand Univ, Dept Phys, Rohtak 124001, Haryana, India
[3] Thapar Univ, Sch Phys & Mat Sci, Patiala 147004, Punjab, India
来源：
COMPOSITES SCIENCE AND TECHNOLOGY | 2011年 / 71卷 / 15期
关键词：
Nanocomposites; Thermal properties; Magnetic properties; Thermogravimetric analysis (TGA); Transmission electron microscopy (TEM); M-TYPE FERRITE; COMPLEX PERMITTIVITY; MAGNETIC-PROPERTIES; CHEMICAL SENSORS; SULFONIC-ACID; GHZ RANGE; COMPOSITE; POLYMER; ABSORBER; NANOPARTICLES;
D O I：
10.1016/j.compscitech.2011.08.010
中图分类号：
TB33 [复合材料];
学科分类号：
摘要：
The present paper deals with the synthesis of conducting ferromagnetic polyaniline-CoFe2O4 (PC) nanocomposites via one-step chemical oxidative polymerization of aniline in the presence of CoFe2O4 nanoparticles (30-40 nm). These nanocomposites of PC have been characterized by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM). Extended thermal analysis has revealed that the activation energy of these nanocomposites varies from 75.3 to 84.3 kJ/mol as compared to the activation energy of 50.3 kJ/mol for polyaniline-DBSA. In addition, dielectric and microwave absorption properties of the nanocomposites have been measured in the frequency range of 12.4-18 GHz (Ku-band) which demonstrate that more than 99% attenuation of microwaves (SEA = 21.5 dB) has been achieved using these nanocomposites. Systematic investigations reveal that the CoFe2O4 nanoparticles in the polyaniline matrix have phenomenal effect in determining the microwave absorption properties of the nanocomposites. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1754 / 1760
页数：7
相关论文
共 37 条
[1]   Complex permittivity, complex permeability and microwave absorption properties of ferrite-polymer composites [J].
Abbas, S. M. ;
Dixit, A. K. ;
Chatterjee, R. ;
Goel, T. C. .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2007, 309 (01) :20-24
[2]   Complex permittivity and microwave absorption properties of a composite dielectric absorber [J].
Abbas, S. M. ;
Chandra, Mahesh ;
Verma, A. ;
Chatterjee, R. ;
Goel, T. C. .
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 2006, 37 (11) :2148-2154
[3]   Chemical sensors using peptide-functionalized conducting polymer nanojunction arrays [J].
Aguilar, AD ;
Forzani, ES ;
Li, XL ;
Tao, NJ ;
Nagahara, LA ;
Amlani, I ;
Tsui, R .
APPLIED PHYSICS LETTERS, 2005, 87 (19) :1-3
[4]   Effects of solvent and annealing on the improved performance of solar cells based on poly(3-hexylthiophene): Fullerene [J].
Al-Ibrahim, M ;
Ambacher, O ;
Sensfuss, S ;
Gobsch, G .
APPLIED PHYSICS LETTERS, 2005, 86 (20) :1-3
[5]   Preparation, characterization and conducting properties of nanocomposites of successively intercalated polyaniline (PANI) in montmorillonite (MMT) [J].
Bandara, WMAT ;
Krishantha, DMM ;
Perera, JSHQ ;
Rajapakse, RMG ;
Tennakoon, DTB .
JOURNAL OF COMPOSITE MATERIALS, 2005, 39 (09) :759-775
[6]   KINETIC PARAMETERS FROM THERMOGRAVIMETRIC DATA [J].
COATS, AW ;
REDFERN, JP .
NATURE, 1964, 201 (491) :68-&
[7]   Synthesis and characterization of composites of DBSA-doped polyaniline and polystyrene-based ionomers [J].
Del Castillo-Castro, T. ;
Castillo-Ortega, M. M. ;
Villarreal, I. ;
Brown, F. ;
Grijalva, H. ;
Perez-Tello, M. ;
Nuno-Donlucas, S. M. ;
Puig, J. E. .
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 2007, 38 (02) :639-645
[8]   Characterization and dielectric properties of polyaniline-TiO2 nanocomposites [J].
Dey, A ;
De, S ;
De, A ;
De, SK .
NANOTECHNOLOGY, 2004, 15 (09) :1277-1283
[9]   Electromagnetic shielding behaviour of conducting polyaniline composites [J].
Dhawan, S. K. ;
Singh, N. ;
Rodrigues, D. .
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, 2003, 4 (02) :105-113
[10]   MAGNETIC-PROPERTIES OF SPHERICAL FCC CLUSTERS WITH RADIAL SURFACE ANISOTROPY [J].
DIMITROV, DA ;
WYSIN, GM .
PHYSICAL REVIEW B, 1995, 51 (17) :11947-11950
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