Magnetoresistive polyaniline-magnetite nanocomposites with negative dielectrical properties

Hongbo Gu; Yudong Huang; Xi Zhang; Qiang Wang; Jiahua Zhu; Lu Shao; Neel Haldolaarachchige; David P. Young; Suying Wei; Zhanhu Guo

doi:10.1016/j.polymer.2011.12.033

Magnetoresistive polyaniline-magnetite nanocomposites with negative dielectrical properties

Hongbo Gu, Yudong Huang, Xi Zhang, Qiang Wang, Jiahua Zhu, Lu Shao, Neel Haldolaarachchige, David P. Young, Suying Wei, Zhanhu Guo

Research output: Contribution to journal › Article › peer-review

239 Scopus citations

Abstract

Magnetic polyaniline (PANI) polymer nanocomposites (PNCs) reinforced with magnetite (Fe₃O₄) nanoparticles (NPs) have been successfully synthesized using a facile surface initiated polymerization (SIP) method. The chemical structures of the PANI/Fe₃O₄ PNCs are characterized by Fourier transform infrared (FT-IR) spectroscopy. The thermal stability of the PANI/Fe₃O₄ PNCs is performed by thermogravimetric analysis (TGA). Both transmission electron microscopy (TEM) and scanning electron microscopy (SEM) are used to characterize the morphologies of the PANI, Fe₃O₄ nanoparticles (NPs) and the PNCs. X-ray diffraction (XRD) shows a significant effect of the Fe₃O ₄ NPs on the crystallization structure of the formed PANI. The dielectrical properties of these PNCs are strongly related to the Fe ₃O₄ nanoparticle loadings and unique negative permittivity is observed in all the samples. Temperature dependent resistivity analysis from 50 to 290 K reveals a quasi 3-dimension variable range hopping (VRH) electron conduction mechanism for the nanocomposite samples. The PNCs do not show hysteresis loop with zero coercivity, indicating the superparamagnetic behavior at room temperature. The PNCs with 30 wt% Fe₃O₄ NP loading exhibit a larger positive magnetoresistance (MR = 95%) than 53% of the pure PANI.

Original language	English
Pages (from-to)	801-809
Number of pages	9
Journal	Polymer
Volume	53
Issue number	3
DOIs	https://doi.org/10.1016/j.polymer.2011.12.033
State	Published - 2 Feb 2012
Externally published	Yes

Keywords

Dielectrical properties
Magnetic polyaniline nanocomposites
Magnetoresistance

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10.1016/j.polymer.2011.12.033

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title = "Magnetoresistive polyaniline-magnetite nanocomposites with negative dielectrical properties",

abstract = "Magnetic polyaniline (PANI) polymer nanocomposites (PNCs) reinforced with magnetite (Fe3O4) nanoparticles (NPs) have been successfully synthesized using a facile surface initiated polymerization (SIP) method. The chemical structures of the PANI/Fe3O4 PNCs are characterized by Fourier transform infrared (FT-IR) spectroscopy. The thermal stability of the PANI/Fe3O4 PNCs is performed by thermogravimetric analysis (TGA). Both transmission electron microscopy (TEM) and scanning electron microscopy (SEM) are used to characterize the morphologies of the PANI, Fe3O4 nanoparticles (NPs) and the PNCs. X-ray diffraction (XRD) shows a significant effect of the Fe3O 4 NPs on the crystallization structure of the formed PANI. The dielectrical properties of these PNCs are strongly related to the Fe 3O4 nanoparticle loadings and unique negative permittivity is observed in all the samples. Temperature dependent resistivity analysis from 50 to 290 K reveals a quasi 3-dimension variable range hopping (VRH) electron conduction mechanism for the nanocomposite samples. The PNCs do not show hysteresis loop with zero coercivity, indicating the superparamagnetic behavior at room temperature. The PNCs with 30 wt% Fe3O4 NP loading exhibit a larger positive magnetoresistance (MR = 95%) than 53% of the pure PANI.",

keywords = "Dielectrical properties, Magnetic polyaniline nanocomposites, Magnetoresistance",

author = "Hongbo Gu and Yudong Huang and Xi Zhang and Qiang Wang and Jiahua Zhu and Lu Shao and Neel Haldolaarachchige and Young, {David P.} and Suying Wei and Zhanhu Guo",

year = "2012",

month = feb,

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TY - JOUR

T1 - Magnetoresistive polyaniline-magnetite nanocomposites with negative dielectrical properties

AU - Gu, Hongbo

AU - Huang, Yudong

AU - Zhang, Xi

AU - Wang, Qiang

AU - Zhu, Jiahua

AU - Shao, Lu

AU - Haldolaarachchige, Neel

AU - Young, David P.

AU - Wei, Suying

AU - Guo, Zhanhu

PY - 2012/2/2

Y1 - 2012/2/2

N2 - Magnetic polyaniline (PANI) polymer nanocomposites (PNCs) reinforced with magnetite (Fe3O4) nanoparticles (NPs) have been successfully synthesized using a facile surface initiated polymerization (SIP) method. The chemical structures of the PANI/Fe3O4 PNCs are characterized by Fourier transform infrared (FT-IR) spectroscopy. The thermal stability of the PANI/Fe3O4 PNCs is performed by thermogravimetric analysis (TGA). Both transmission electron microscopy (TEM) and scanning electron microscopy (SEM) are used to characterize the morphologies of the PANI, Fe3O4 nanoparticles (NPs) and the PNCs. X-ray diffraction (XRD) shows a significant effect of the Fe3O 4 NPs on the crystallization structure of the formed PANI. The dielectrical properties of these PNCs are strongly related to the Fe 3O4 nanoparticle loadings and unique negative permittivity is observed in all the samples. Temperature dependent resistivity analysis from 50 to 290 K reveals a quasi 3-dimension variable range hopping (VRH) electron conduction mechanism for the nanocomposite samples. The PNCs do not show hysteresis loop with zero coercivity, indicating the superparamagnetic behavior at room temperature. The PNCs with 30 wt% Fe3O4 NP loading exhibit a larger positive magnetoresistance (MR = 95%) than 53% of the pure PANI.

AB - Magnetic polyaniline (PANI) polymer nanocomposites (PNCs) reinforced with magnetite (Fe3O4) nanoparticles (NPs) have been successfully synthesized using a facile surface initiated polymerization (SIP) method. The chemical structures of the PANI/Fe3O4 PNCs are characterized by Fourier transform infrared (FT-IR) spectroscopy. The thermal stability of the PANI/Fe3O4 PNCs is performed by thermogravimetric analysis (TGA). Both transmission electron microscopy (TEM) and scanning electron microscopy (SEM) are used to characterize the morphologies of the PANI, Fe3O4 nanoparticles (NPs) and the PNCs. X-ray diffraction (XRD) shows a significant effect of the Fe3O 4 NPs on the crystallization structure of the formed PANI. The dielectrical properties of these PNCs are strongly related to the Fe 3O4 nanoparticle loadings and unique negative permittivity is observed in all the samples. Temperature dependent resistivity analysis from 50 to 290 K reveals a quasi 3-dimension variable range hopping (VRH) electron conduction mechanism for the nanocomposite samples. The PNCs do not show hysteresis loop with zero coercivity, indicating the superparamagnetic behavior at room temperature. The PNCs with 30 wt% Fe3O4 NP loading exhibit a larger positive magnetoresistance (MR = 95%) than 53% of the pure PANI.

KW - Dielectrical properties

KW - Magnetic polyaniline nanocomposites

KW - Magnetoresistance

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DO - 10.1016/j.polymer.2011.12.033

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SP - 801

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JO - Polymer

JF - Polymer

IS - 3

ER -

Magnetoresistive polyaniline-magnetite nanocomposites with negative dielectrical properties

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