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Synthesis and characterisation of metal oxyhydroxide and oxide nanomaterials

Yang, Jing (2010) Synthesis and characterisation of metal oxyhydroxide and oxide nanomaterials. PhD by Publication, Queensland University of Technology.

Abstract

In this work, a range of nanomaterials have been synthesised based on metal oxyhydroxides MO(OH), where M=Al, Co, Cr, etc. Through a self-assembly hydrothermal route, metal oxyhydroxide nanomaterials with various morphologies were successfully synthesised: one dimensional boehmite (AlO(OH)) nanofibres, zero dimensional indium hydroxide (In(OH)3) nanocubes and chromium oxyhydroxide (CrO(OH)) nanoparticles, as well as two dimensional cobalt hydroxide and oxyhydroxide (Co(OH)2 & CoO(OH)) nanodiscs. In order to control the synthetic nanomaterial morphology and growth, several factors were investigated including cation concentration, temperature, hydrothermal treatment time, and pH. Metal ion doping is a promising technique to modify and control the properties of materials by intentionally introducing impurities or defects into the material. Chromium was successfully applied as a dopant for fabricating doped boehmite nanofibres. The thermal stability of the boehmite nanofibres was enhanced by chromium doping, and the photoluminescence property was introduced to the chromium doped alumina nanofibres. Doping proved to be an efficient method to modify and functionalize nanomaterials. The synthesised nanomaterials were fully characterised by X-ray diffraction (XRD), transmission electron microscopy (TEM) combined with selected area electron diffraction (SAED), scanning electron microscopy (SEM), BET specific surface area analysis, X-ray photoelectron spectroscopy (XPS) and thermo gravimetric analysis (TGA). Hot-stage Raman and infrared emission spectroscopy were applied to study the chemical reactions during dehydration and dehydroxylation. The advantage of these techniques is that the changes in molecular structure can be followed in situ and at the elevated temperatures.

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ID Code: 45712
Item Type: QUT Thesis (PhD by Publication)
Supervisor: Frost, Ray, Martens, Wayde, & Zhu, Huai
Keywords: aluminium oxyhydroxide, chromium oxyhydroxide, cobalt oxyhydroxide, cobalt hydroxide, indium hydroxide, chromium doped, dopant, alumina, aluminium oxide, indium oxide, chromium oxide, chromium oxide gel, cobalt oxide, boehmite, grimaldiite, eskolaite, heterogenite, nanostructure, nanofibres, nanorods, nanoparticles, nanodiscs, nanocubes, nanotubes, nanosheets, nanomaterials, self-assembly, hydrothermal treatment, x-ray diffraction, transmission electron microscopy, scanning electron microscopy, x-ray photoelectron spectroscopy, n2 adsorption,desorption, thermal decomposition, thermogravimetric analysis, raman spectroscopy, hot-stage raman, infrared spectroscopy, infrared emission spectroscopy
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Institution: Queensland University of Technology
Deposited On: 05 Sep 2011 12:40
Last Modified: 05 Sep 2011 12:40

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