Sub-30 nm Fe3O4 and γ-Fe2O3 octahedral particles: preparation and microwave absorption properties

• Published in: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology Vol. 15; no. 12
• Main Authors: Li, Wanxi, Lv, Baoliang, Xu, Yao
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.12.2013; Springer
• Subjects: Characterization and Evaluation of Materials; Chemical synthesis methods; Chemistry and Materials Science; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Growth from solutions; Inorganic Chemistry; Lasers; Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties; Materials Science; Methods of crystal growth; physics of crystal growth; Methods of nanofabrication; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Nanotechnology; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Research Paper; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Microwave absorption properties; Hydrothermal synthesis; Nanostructures; γ-Fe; Fe; O; Phosphates; Particle size; Frequency dependence; Keywords Fe; Nanoparticles; Transmission electron microscopy; Crystal growth from solutions; Nanostructured materials; Nanomaterial synthesis
• ISSN: 1388-0764; 1572-896X
• DOI: 10.1007/s11051-013-2114-3

A simple low-cost hydrothermal method has been developed to fabricate uniformly dispersed octahedral Fe 3 O 4 nanoparticles with tunable size. The particle size can be reduced to 20–30 nm under the effect of phosphate, meanwhile, the edetate disodium can improve the dispersivity of particles. High-resolution transmission electron microscope showed that the octahedral Fe 3 O 4 nanoparticle was enclosed by eight (111) planes. Octahedral γ-Fe 2 O 3 nanoparticles were obtained by reoxidizing the as-synthesized Fe 3 O 4 nanoparticles. The microwave absorption properties of the octahedral Fe 3 O 4 and γ-Fe 2 O 3 nanoparticles were measured in the frequency range of 2–18 GHz. A minimum reflection loss of −28 dB was observed at 8.6 GHz for octahedral Fe 3 O 4 nanoparticles.