Temperature-dependent thermal stability and dispersibility of SiO2-TiO2 nanocomposites via a chemical vapor condensation method

Minsu Kim, Eunseuk Park, Hyounduk Jung, Seong Taek Yun, Jongsoo Jurng

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Surface-modified TiO2 nanoparticles were prepared by a chemical vapor condensation method (CVC). The resultant nanocomposites were subjected to post-heat treatment with various temperatures. The sedimentation behavior of the surface-modified TiO2 nanoparticles in aqueous solution was investigated visually using a separation analyzer. The dispersion stabilities of the pure CVC-made TiO2 and the surface modified SiO2-TiO2 samples were enhanced due to low zeta potential values compared to a commercial TiO2 sample (P25). With increasing heat treatment temperature, the photocatalytic activity of the pure TiO2 samples (CVC-TiO2 and P25) suddenly dropped, which resulted from the increased particle size and the reduced anatase content. For the surface-modified TiO2 nanoparticles, the anatase-to-rutile phase transformation process did not occur even at 900°C. Although the surface-modified TiO2 nanoparticles formed using the chemical vapor condensation method were thermally treated with high temperature, the photocatalytic activity was higher than that of the pure TiO2 samples. This is probably due to the fact that the surface-modified TiO2 nanoparticles had increased thermal stability, and SiO2 provides better adsorption sites in the vicinity of the TiO2.

Original languageEnglish
Pages (from-to)153-160
Number of pages8
JournalPowder Technology
Publication statusPublished - 2014 Nov

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (Ministry of Science, ICT & Future Planning) (2014, University-institute cooperation program 2N38812 ), The Korea institute of Science and Technology (KIST) Institutional Program ( 2E24652 ).


  • Chemical vapor condensation (CVC)
  • Heat treatment
  • Nanocomposites
  • Nanoparticles

ASJC Scopus subject areas

  • General Chemical Engineering


Dive into the research topics of 'Temperature-dependent thermal stability and dispersibility of SiO2-TiO2 nanocomposites via a chemical vapor condensation method'. Together they form a unique fingerprint.

Cite this