Preparation and characterization of shuttle-like {alpha}-Fe{sub 2}O{sub 3} nanoparticles by supermolecular template

Journal Article · Thu Sep 15 00:00:00 EDT 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.06.018· OSTI ID:20729087

Xianming, Liu ^[1]; Shaoyun, Fu ^[1]; Hongmei, Xiao ^[1]; Chuanjun, Huang ^[1]

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1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080 (China)

Shuttle-like {alpha}-Fe{sub 2}O{sub 3} nanoparticles have been successfully synthesized via a new soft-template route using polyethylene glycol (PEG) as polymer, cetyltrimethylammonium bromide (CTAB) as surfactant and FeCl{sub 3}.6H{sub 2}O as iron source materials. Meanwhile, spherical {alpha}-Fe{sub 2}O{sub 3} nanoparticles are also fabricated under the similar conditions without surfactant and polymer. The resultant products are characterized by means of thermalgravimetric analysis (TGA), powder X-ray diffraction (XRD), infrared (IR) spectroscopy, transmission electron micrograph (TEM), X-ray photoelectron spectra (XPS) and magnetization measurements. The homogeneous {alpha}-Fe{sub 2}O{sub 3} nanoparticles with shuttle-like shape have an average length of 120 nm and a mean diameter of about 50 nm in the middle part (an average aspect ratio of about 2.5) whereas spherical {alpha}-Fe{sub 2}O{sub 3} nanoparticles have a mean particle diameter of about 35 nm. Magnetic hysteresis measurements reveal that shuttle-like {alpha}-Fe{sub 2}O{sub 3} nanoparticles display normal ferromagnetic behaviors while spherical {alpha}-Fe{sub 2}O{sub 3} nanoparticles exhibit weak ferromagnetic behaviors at room temperature. The two types of {alpha}-Fe{sub 2}O{sub 3} exhibit hysteretic features with the remanence and coercivity of 0.156 emu/g and 664 Oe, 0.048 emu/g and 110 Oe, respectively. The higher remanent magnetization and coercivity of shuttle-like {alpha}-Fe{sub 2}O{sub 3} nanoparticles may be associated with the aspect ratio of {alpha}-Fe{sub 2}O{sub 3} since shape anisotropy would exert a tremendous influence on their magnetic properties.

• OSTI ID: 20729087
• Journal Information: Journal of Solid State Chemistry, Vol. 178, Issue 9; Other Information: DOI: 10.1016/j.jssc.2005.06.018; PII: S0022-4596(05)00277-X; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANISOTROPY
ASPECT RATIO
COBALT COMPOUNDS
COERCIVE FORCE
FERROMAGNETISM
HYSTERESIS
INFRARED SPECTRA
IRON OXIDES
MAGNETIC PROPERTIES
MAGNETIZATION
NANOSTRUCTURES
PARTICLES
POLYETHYLENE GLYCOLS
SPHERICAL CONFIGURATION
TEMPERATURE RANGE 0273-0400 K
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY