Processible nanostructured materials with electrical conductivity and magnetic susceptibility: Preparation and properties of maghemite/polyaniline nanocomposite films

Ben Zhong Tang*, Yanhou Geng, Jacky Wing Yip Lam, Bensheng Li, Xiabin Jing, Xianhong Wang, Fosong Wang, A. B. Pakhomov, X. X. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

398 Scopus citations

Abstract

We here present a versatile process for the preparation of maghemite/polyaniline (γ-Fe2O3/PAn) nanocomposite films with macroscopic processibility, electrical conductivity, and magnetic susceptibility. The γ-Fe2O3 nanoparticles are coated and the PAn chains are doped by anionic surfactants of ω-methoxypoly(ethylene glycol) phosphate (PEOPA), 4-dodecylbenzenesulfonic acid (DBSA), and 10-camphorsulfonic acid (CSA). Both the coated γ-Fe2O3 and the doped PAn are soluble in common organic solvents, and casting of the homogeneous solutions gives free-standing nanocomposite films with γ-Fe2O3 contents up to ∼50 wt %. The morphology of the γ-Fe2O3 nanoparticles are characterized by transmission electron microscopy, UV-vis spectroscopy, and X-ray diffractometry. The γ-Fe2O3/PAn. films prepared from chloroform/m-cresol solutions of DBSA-coated γ-Fe2O3 and CSA-doped PAn are conductive (σ = 82-237 S/cm) and superparamagnetic, exhibiting no hysteresis at room temperature. The zero-field-cooled magnetization experiment reveals that the nanocomposite containing 20.8 wt % γ-Fe2O3 has a blocking temperature (Tb) in the temperature region of 63-83 K.

Original languageEnglish (US)
Pages (from-to)1581-1589
Number of pages9
JournalChemistry of Materials
Volume11
Issue number6
DOIs
StatePublished - 1999

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry

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