THESIS
2014
xxiii, 179 pages : illustrations (some color) ; 30 cm
Abstract
This research work has invented a novel general synthesis method for producing
spatial doping of 1D titanium based nanotubes. For this, we divided our work in two
phases. In the first phase of the work, we present general synthesis methods for
producing Ti-based nanostuctures, more precisely nanotubes, and elucidate their
formation mechanisms based on ex-situ microscopic analysis and in-situ
spectroscopic analysis. Titanium based nanostructures are produced from different
Ti-sources by using alkaline microwave hydrothermal irradiation techniques. There
are number of factors that affect its nanostructure. Post-treatment washing is the main
crucial step which effects Ti-nanotube structure and morphology, crystal size, textural
properties and composition.
In the second phase of t...[
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This research work has invented a novel general synthesis method for producing
spatial doping of 1D titanium based nanotubes. For this, we divided our work in two
phases. In the first phase of the work, we present general synthesis methods for
producing Ti-based nanostuctures, more precisely nanotubes, and elucidate their
formation mechanisms based on ex-situ microscopic analysis and in-situ
spectroscopic analysis. Titanium based nanostructures are produced from different
Ti-sources by using alkaline microwave hydrothermal irradiation techniques. There
are number of factors that affect its nanostructure. Post-treatment washing is the main
crucial step which effects Ti-nanotube structure and morphology, crystal size, textural
properties and composition.
In the second phase of this work, we present a new synthesis method to prepare metal
and metal oxide doped on different spatial locations of the titania nanotubes (i.e. core,
surface and interlayer spaces). The precursors are introduced by either in-situ or
ex-situ techniques to the titania precursor materials. Dopants from the Group IB, IIB,
IVB, V and VIII element including Ag, Au, Co, Cu, Pd, Pt and V and their oxides etc were successfully doped on the surface, in the core and within the interlayer spaces of
the titania nanotubes. The location of the dopants was manipulated by controlling the
affinity of the dopant precursor to the titania surface during the preparation. Precursor
with low affinity will preferentially decorate the nanotube surface, whereas strong
affinity will lead to metal being embedded between the interlayer spaces of the
nanotube. Intermediate affinity allows core-filling to produce metal particles, slugs or
nanowires within the core of the nanotubes. Microscopy and spectroscopy studies
were carried out to investigate the structural, chemical and electronic properties of
these new nanotube materials and explore their application for catalytic conversions,
biomedical applications etc.
To examine these doped Ti-nanotubes, visible light photocatalytic and antibacterial
tests have been done. Here, we present silver doped Ti-nanotubes that can apply for
adsorption, UV and/or visible range photocatalyst or antimicrobial properties.
Application results show 100% adsorption ability for diclofenac sodium (DFS), an
endocrine disrupting compounds and 99% degradation ability for a model pollutant,
2,4 dicholorphenol compare to P25 (10%). The samples can effectively works as
bacterial inhibitors and show bactericidal properties against Staphylococcus aureus (S.
aureus) and Escherichia coli (E.coli). For E-coli 100% reduction activity was found.
We are presented the S.aureus reduction activity under different conditions, such as,
UVA, under dark and/or under visible light (6W fluorescence lamp). In most cases S.
aureus reduction activity was up to 99.999%.
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