One-Dimensional Chainlike Arrays of Fe₃O₄ Hollow Nanospheres Synthesized by Aging Iron Nanoparticles in Aqueous Solution

Abstract

One-dimensional (1D) chainlike arrays of hollow magnetic Fe3O4 spheres have been prepared by simply aging magnetically preassembled Fe nanoparticles in aqueous solution at room temperature. The diameter of the 1D nanomaterials is about 100−200 nm, and the length is up to 1−3 μm, observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The structure and magnetic properties of the Fe3O4 hollow chains were characterized by X-ray powder diffraction (XRD) and via a superconducting quantum interference device (SQUID) magnetometer. Mechanism investigations on the time dependent process reveal these hollow nanostructures were formed based on the nanoscale Kirkendall effect. Besides the aqueous microenvironment, the partial pressure of oxygen is of great importance in the formation of 1D chainlike Fe3O4 hollow nanostructures.

One-step synthesis of MFe2O4 (M=Fe, Co) hollow spheres by template-free solvothermal method

“…In recent years, hollow structure nanoparticles have evoked immense interest of numerous researchers due to their unique physical and chemical properties, such as having a large specific surface area and low density which greatly exhibit potential applications in optics [1][2][3], photonic catalysis [4,5], fuel cells [6], lithium ion batteries [7], medicine release [8,9] and targeted drug delivery [10]. Many methods have been developed for preparing the hollow spheres.…”

Size-controlled synthesis and magnetic properties of NiFe2O4 hollow nanospheres via a gel-assistant hydrothermal route

“…Metal oxide hollow nanostructures are of great interest not only because of their unique physical and chemical properties such as low density, large specific surface area, and hollow structures, but also for their favorable applications in many areas such as catalysis, optics, electrics, magnetics, and medicine release, drug delivery, and selective adsorption [1][2][3][4][5][6]. Recently, considerable attention has been focused on the controlled synthesis of metal oxide hollow nanospheres and investigation of their size-and shape-dependent properties as well as corresponding applications, and various methods has been developed for the fabrication of them.…”

Shape-controlled synthesis of Fe3O4 nanocrystals with incontinuous multicavities

“…As one of the most important transition metal oxides, magnetite(Fe 3 O 4 ) has aroused extensive attention because of its unique properties and great potential applications in catalytic agent, magnetic fluid, water treatment, lithium ion battery, magnetic resonance imaging(MRI), magnetic carriers, contrasting agents [1][2][3][4][5][6][7][8][9][10] , and so forth. To date, Fe 3 O 4 nanoparticles with different morphologies, such as nanosphere [11] , tetrakaidecahedra [12] , pyramid [13] , nanosheet, flower-liked structure [14] , spindle [15] , nanoring [16] , dendrite pattern [17] , and wire-like structure [18] have been synthesized with the help of a variety of methods, including reverse-micelle transition, hydro-or solvothermal treatment, magnetic-field induction, wet-chemical etching, chemical vapor deposition and polyol-mediated processes [19][20][21][22][23] .…”