Synthesis and Characterization of Ultrahigh Crystalline TiO₂ Nanotubes

Abstract

Ultrahigh crystalline TiO2 nanotubes were synthesized by hydrogen peroxide treatment of very low crystalline titania nanotubes (TiNT-as prepared), which were prepared with synthesized TiO2 nanoparticles by hydrothermal methods in an aqueous NaOH solution. Thus, prepared ultrahigh crystalline TiO2 nanotubes (TiNT-H2O2) showed comparable crystallinity with high crystalline TiO2 nanoparticles. The details of nanotubular structures were elucidated by high resolution-transmission electron microscopy (HR-TEM), field emission-scanning electron microscopy (FE-SEM), energy-dispersive X-ray analysis in transmission electron microscopy (TEM-EDX), X-ray diffraction (XRD), photoluminescence (PL), and BET surface area. TiNT-H2O2 was found to be a multiwalled anatase phase only with an average outer diameter of approximately 8 nm and an inner diameter of approximately 5 nm and grown along the [001] direction to 500-700 nm long with an interlayer fringe distance of ca. 0.78 nm. The photocatalytic activity of TiNT-H2O2 was about 2-fold higher than those of TiNT-as prepared, synthesized TiO2 nanoparticles, and TiO2-P25 (Degussa) in the photocatalytic oxidation of trimethylamine gas under UV irradiation.

Iron and chromium doped titanium dioxide nanotubes for the degradation of environmental and industrial pollutants

“…Among these nanostructures, the titanium dioxide nanotubalar materials are of high interest due to chemical inertness, strong oxidizing power, large surface area, non toxicity, high photocatalytic activitry, high cation exchange capacity, strong oxidizer, low cost of production and relatively good stability at elevated temperatures (Khan et al, 2006;Samarghandi et al, 2007;Liang and Li, 2009). This material extensively explored as a catalyst for water splitting and for the production of solar hydrogen (Chen et al, 2005).…”

“…This material extensively explored as a catalyst for water splitting and for the production of solar hydrogen (Chen et al, 2005). As a catalyst for the conversion of green house gases into energy producing products for methane and methanol (Chen et al, 2005;Khan et al, 2006). Moreover these nanotubes are widely exploited in lithium ions batteries, electrochemical devices, gas sensors, photoluminescence ion exchange and in photovoltaic dye sensitized solar cells (Kuang et al, 2008).…”

“…Latter on TiO 2 based nanotubes (TNTs) of different geometrical shapes and microstructures have been developed through various approaches, for example the electrochemical anodic oxidation of Ti, assisted tempelate method and alkaline hydrothermal treatment (Wang et al, 2004;Khan et al, 2006;Mohapatra et al, 2007;Liang and Li 2009). There are advantages and limitations in each of above mentioned methods like attaining uniform inner diameter of titanium dioxide nanotubes and controlling the morphology, shape and length of the synthesized nanotubes (Wang et al, 2004;Liang and Li 2009).…”

Photocatalytical Properties of TiO₂ Nanotubes

“…In contrast, an ordered and strongly interconnected nanoscale architecture offers the potential for improved electron transport leading to higher photoefficiency. This has resulted in one-dimensional TiO 2 materials, such as nanowires, nanorods and hollow nanotubes, receiving a great deal of attention in recent 3 years [14,15]. Among these materials, hollow TiO 2 nanotubes that have surface arearelated properties can further improve photocatalytic properties because they demonstrate a superior electron transport.…”

Effects of structure of anodic TiO2 nanotube arrays on photocatalytic activity for the degradation of 2,3-dichlorophenol in aqueous solution

“…Many researches have proven that multidimensional TiO 2 has the higher photochemical reactivity than that of bulk TiO 2 particles [5][6][7]. Advances in the nanoscale technology facilitated the synthesis of highly-ordered and multidimensional structured materials.…”