Processible nanostructured materials with electrical conductivity and magnetic susceptibility

唐本忠
论文

Processible nanostructured materials with electrical conductivity and magnetic susceptibility

本忠唐

Hong Kong University of Science and Technology

发表时间：1999

期刊：Chemistry of Materials

语言：English

U R L： http://www.scopus.com/inward/record.url?scp=0000687331&partnerID=8YFLogxK

摘要

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 (T_b) in the temperature region of 63-83 K.

文献指纹

化合物

polyaniline

10-camphorsulfonic acid

Nanocomposite films

Magnetic susceptibility

dodecylbenzenesulfonic acid

ferric oxide

Nanostructured materials

Electric Conductivity

Nanoparticles

3-cresol

Anionic surfactants

Organic solvents

X ray diffraction analysis

Ethylene Glycol

Temperature

Magnetization

Chloroform

Spectroscopy

Nanocomposites

Transmission electron microscopy

Hysteresis

Phosphates

Casting

Experiments

工程与材料科学