title: Surfactant-assisted synthesis of alpha-Fe2O3 nanotubes and nanorods with shape-dependent magnetic properties.
abstract: Alpha-Fe(2)O(3) nanorods and nanotubes have been synthesized and characterized by high-resolution transmission electron microscopy and X-ray diffraction. By means of different surfactant assistance, the high-quality one-dimensional products were obtained, respectively, with aqueous butanol solution as the solvent and carbamide as the base, giving rise to single-crystalline products at 150 degrees C. The formation mechanism has been presented. Significantly, the magnetic investigations show that the magnetic properties are strongly shape-dependent; i.e., the nanorods have a Morin transition at 166 K from canted antiferromagnetic state to antiferromagnetic state, while the nanotubes exhibit a three-dimensional magnetic ordering above 300 K that has been attributed to the presence of small particles in a few regions of the tubes.
authors.affiliation: Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Liu
authors.forename: Hui-Zhong
authors.initials: HZ
authors.lastname: Kou
authors.forename: Wenling
authors.initials: W
authors.lastname: Mo
authors.forename: Huajie
authors.initials: H
authors.lastname: Liu
authors.forename: Yuqiu
authors.initials: Y
authors.lastname: Wang