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Preparation of high surface area titania (TiO2) films and powders using particulate sol-gel route aided by polymeric fugitive agents

Mohammadi, M. R ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1016/j.snb.2006.01.046
  3. Publisher: 2006
  4. Abstract:
  5. High specific surface area (SSA) nanocrystalline powders and dip-coated TiO2 films have been prepared by particulate sol-gel route aided with polymeric fugitive agents (PFA), namely trehalose dihydrate (THD), polyethylene glycol (PEG6000) and hydroxypropyl cellulose (HPC). Powders obtained without PFA, heat-treated at 160 °C show a SSA of 181 m2/g, a value that could be increased up to 271 and 223 m2/g for samples heat-treated at 300 °C when PEG6000 and HPC were used, respectively, whereas SSA of 201 m2/g were achieved by using THD and subsequence heat-treating at 500 °C. Such surface area is one of the highest reported in the literature under these conditions. Crystallite sizes vary from 1 nm for as-produced powders up to 4 nm for powders heat-treated at 600 °C. It was found that crystallite size, microstructure, specific surface area and phase transformation are strongly dependent upon the PFA/TiO2 ratio and annealing temperature. Films produced under optimised conditions showed excellent microstructural properties for gas sensing applications. © 2006 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Chemical sensors ; Heat treatment ; Microstructure ; Powders ; Sol-gels ; Thin films ; Annealing temperature ; Polymeric fugitive agents (PFA) ; Sol-gel processes ; Specific surface area ; Titanium oxides
  8. Source: Sensors and Actuators, B: Chemical ; Volume 120, Issue 1 , 2006 , Pages 86-95 ; 09254005 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0925400506000724