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, Volume 2, Issue 2, pp 95–104 | Cite as

UV-Absorption and Silica/Titania Colloids Using a Core–Shell Approach

  • Liang Zhou
  • Hendrik Heinz
  • Mark D. Soucek
  • Elvin A. Alemán
  • David A. Modarelli
Original Paper

Abstract

Metal-oxo-colloids have been prepared using tetraethoxysilane (TEOS) oligomers with titanium tetra-i-propoxide (TIP) or titanium (di-i-propoxide) bis(acetylacetonate) (TIA) precursors. Transmission electron microscopy (TEM), FTIR, UV-Vis, and photoluminescence spectroscopy were used to investigate the composition, the size, and optical properties of the Si/Ti core–shell colloids. The presence of hetero-bonded silicate structure (Si–O–Ti) was indicated by FTIR spectroscopy. The size of Si/TIP system ranged from 55 to 120 nm and Si/TIA system ranged from 220 to 250 nm. The TEM data indicated that the size of colloids can be controlled by the TIP or TIA content. The Si/Ti system exhibited strong absorption in the UV-range, yet had excellent optical transmittance in the visible range. The Si/Ti systems exhibited a photoluminescence emission at 329 nm.

Keywords

Silica Colliod Sol–Gel Photoluminescence 

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Copyright information

© Springer Science & Business Media BV 2010

Authors and Affiliations

  • Liang Zhou
    • 1
  • Hendrik Heinz
    • 1
  • Mark D. Soucek
    • 1
  • Elvin A. Alemán
    • 2
  • David A. Modarelli
    • 2
  1. 1.Department of Polymer EngineeringUniversity of AkronAkronUSA
  2. 2.Department of Chemistry and The Center for Laser and Optical SpectroscopyUniversity of AkronAkronUSA

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