PLD-Assisted VLS Growth of Aligned Ferrite Nanorods, Nanowires, and NanobeltsSynthesis, and Properties

Abstract

We report here a systematic synthesis and characterization of aligned alpha-Fe2O3 (hematite), epsilon-Fe2O3, and Fe3O4 (magnetite) nanorods, nanobelts, and nanowires on alumina substrates using a pulsed laser deposition (PLD) method. The presence of spherical gold catalyst particles at the tips of the nanostructures indicates selective growth via the vapor-liquid-solid (VLS) mechanism. Through a series of experiments, we have produced a primitive "phase diagram" for growing these structures based on several designed pressure and temperature parameters. Transmission electron microscopy (TEM) analysis has shown that the rods, wires, and belts are single-crystalline and grow along <111>m or <110>h directions. X-ray diffraction (XRD) measurements confirm phase and structural analysis. Superconducting quantum interference device (SQUID) measurements show that the iron oxide structures exhibit interesting magnetic behavior, particularly at room temperature. This work is the first known report of magnetite 1D nanostructure growth via the vapor-liquid-solid (VLS) mechanism without using a template, as well as the first known synthesis of long epsilon-Fe2O3 nanobelts and nanowires.

Solvothermal Synthesis and Magnetic Property of Magnetic Chains Self‐assembled by Fe3O4 Microoctahedrons

“…[1][2][3][4][5][6] Various approaches have been reported for fabricating Fe 3 O 4 micro/nanocrystals with varied morphologies, for example, hollow spheres, nanorods, nanowires, nanopyramids, nanoplates, etc. [7][8][9][10][11][12][13][14][15] Although Fe 3 O 4 has been synthesized by various methods, the products were overwhelmingly dominated by particles with size of nanometer. With the development of the modern science, it is a great challenge to develop approaches to synthesize magnetic particles with suitable size, which helps to meet special need of biomedical fields.…”

Optical and Dynamic Properties of Undoped and Doped Semiconductor Nanostructures

“…There are several modern examples using VLS to grow many different types of nanowires or other one-dimensional nanostructures [30][31][32][33][34]. One such variation is where a laser ablates a substrate containing a metal/semiconductor mixture to create a semiconductor/metal molten alloy [35][36][37]. The resulting nanowires undergo VLS growth.…”

Template Synthesis and Magnetic Characterization of Feni Nanotubes

“…For synthesis of nanostructures with high aspect ratio, there are many methods of pore filling, such as electrochemical deposition [23], an electron-beam lithography [24], chemical vapor deposition [25], pulsed laser deposition [26], and some other methods [27][28][29]. The most widely used method of metallic nanostructures synthesis is the electrochemical deposition, which allows to efficiently manage the physical and chemical properties of the nanostructures with high degree of process control [8,17,23].…”