Highly porous TiO2 nanofibres with a fractal structure

Aminian, M. Kh ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1088/0957-4484/17/2/030
  3. Publisher: 2006
  4. Abstract:
  5. TiO2 nanofibres were prepared using a templating method with tetraisopropylorthotitanate (TiPT) as a precursor. The preparation comprises liquid phase deposition on cellulose fibres followed by thermal removal of the cellulose template. The obtained TiO2 fibrous substance consists of micron-size fibres with a microstructure of nanofibres. It was demonstrated that nanofibres are basically formed through the aggregation of TiO2 nanoparticles and nanorods into chain structures during the thermal treatment process. The measured surface area of the TiO2 fibres was about 250 m2 g-1. It was shown that the pore size distribution is multi-scale and a fractal morphology was demonstrated with two fractal regimes with dimensions of 1.78 and 2.97 for sizes below and above 7.5 nm, respectively. The crystalline phase of the TiO2 nanofibres, as well as the nanoparticles in the solution, could be controlled by the pH of the solution. A pH of 1.2 resulted in rutile phase, while a pH of 1.8 resulted in anatase phase. © 2006 IOP Publishing Ltd
  6. Keywords:
  7. Heat treatment ; Microstructure ; Morphology ; pH effects ; Pore size ; Titanium dioxide ; Cellulose fibres ; Chain structures ; Fractal structures ; Templating method ; Nanostructured materials
  8. Source: Nanotechnology ; Volume 17, Issue 2 , 2006 , Pages 520-525 ; 09574484 (ISSN)
  9. URL: https://iopscience.iop.org/article/10.1088/0957-4484/17/2/030