One dimensional (1D) nanostructures are of interest because of their extraordinary functional properties originated from their structural peculiarities. Nowadays an application of individual nanoparticles in micro- and nano-electronics is not a routine procedure yet, a detailed study of individual particles behaviour is limited by instrumental facilities.

Titanium dioxide nanotubes and nanorods were obtained in a form of bundles. Both the materials could serve as a porous matrix, for instance, for drinking water filtration, water refinement in industry etc. These materials demonstrate high efficiency in photochemical processes, in catalysis, in electrochemical current sources, in solar cells. Nanotubes and also nanorods are the materials possessing high deficiency, this fact results in oxygen transport improvement and should improve the catalytic activities of nanomaterials in comparison with bulk anatase and rutile.

We studied titanium dioxide nanotubes and nanorods as semiconductor catalysts in the CO oxidation process. The CO/O₂ ratio was varied from 0.75 to 4, the CO concentration we varied in a range of 1 – 25 %. We found an increase of initial conversion temperature with increasing the CO/O₂ ratio. At high total concentration of reactants the 100% conversion level was not achieved on heating up to 300°C. The investigating catalytic process could be described due to the Mars-van Krevelen mechanism.  

The degradation of 1D nanostructures in the studied process is a result of dehydratation. The structures of nanotubes and nanorods changes above 500^oC resulting in O-H group concentration decrease and growth of Ti³⁺ concentration due to XPS spectra, recrystallization. The specific surface area of nanorods increases in this process with the advent of cavities appearance. The diameter of cavities was about 5 – 10 nm.   

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/15460 must be provided.

1. Soft – chemistry preparation of porous globules of nanocrystalline TiO₂ with improved photocatalytic properties
2. Titania nanotubes as an effective support for metal nanoparticles
3. Thermal stability of porous anodic titania films
4. Mesoporous Titanium Dioxide: Preparation and Catalytic Properties
5. Synthesis of organic-inorganic composite films with photonic crystal properties
6. Nanopowders of hydroxyapatite doped with NH₄NO₃ and CaCl₂