Статья

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

Jenny Ruth MorberSchool of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019Yong DingSchool of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019Michael S. HaluskaSchool of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019Yang LiSchool of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019J. Ping LiuSchool of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019Zhong Lin WangSchool of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019Robert L. SnyderSchool of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019

2006en

ABI

Аннотация

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.

Перевод пока недоступен

Идентификаторы

DOI: 10.1021/jp064484i

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar