Room temperature synthesis of mesoporous aggregates of anatase TiO2 nanoparticles

S. B. Deshpande, H. S. Potdar, Y. B. Khollam, K. R. Patil, Renu Pasricha, N. E. Jacob

Research output: Contribution to journalArticlepeer-review

Abstract

The controlled hydrolysis reaction of titanium tetrabutoxide in presence of acetic acid in isopropanol, i.e. in non-aqueous media was adopted in the present work for the synthesis of nanocrystalline titania followed by aging at ambient conditions for longer duration. The powder XRD shows that the as-dried precursor (without any aging) is non-crystalline in nature. However, room temperature aging for longer duration >120 days not only helped to develop crystallinity in TiO2 nanoparticles but also led to the formation of their self-assembly towards mesoporous aggregates creating sponge like TiO2 nano-structure having high surface area ∼250 m2 g-1 and narrow pore size distribution of 4-5 nm. TEM observations revealed the generation of spherical TiO2 nanoparticles (4-5 nm) assembled to form stable spongy scaffold having porous network structure with pore size 5-6 nm. Also, presence of a pronounced hysteresis loop in BET isotherm is indicative of a 3D-intersection network of the pores of size 4-5 nm. Further heat-treatment to the aged precursor at 400 °C/2 h in air modify pore network structure due to sintering of TiO2 particles as is observed in TEM studies and lowering thereby the surface area to 125 m2 g-1.

Original languageEnglish (US)
Pages (from-to)207-212
Number of pages6
JournalMaterials Chemistry and Physics
Volume97
Issue number2-3
DOIs
StatePublished - Jun 10 2006

Keywords

  • Microstructure
  • Porous materials
  • Sol-gel processing
  • Titania

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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