SiO2 and TiO2 Sol-Gel Blends with Tunable Optical and Electronic Properties

Stephanie Arouh, Roland Himmelhuber, Robert A. Norwood

Research output: Contribution to journalArticlepeer-review


Sol-gel blends are created using a combination of a high refractive index (n∼2.4) TiO2 based sol-gel and a low refractive index (n∼1.5) SiO2 based sol-gel. The blends are prepared with different ratios of sol-gels and films are created using the spin coating method on silicon and ITO-on-glass substrates. The film thickness, refractive index, and dielectric constants of the resulting films are measured using profilometry, prism coupling, and LCR measurements, respectively. Results show that including more SiO2 based sol-gel in the initial mixture creates thicker films ranging from 1-7 μm, but results in lower refractive index and lower dielectric constants. This is consistent with expectations due to SiO2 having a lower refractive index and dielectric constant than titania over a range of wavelengths andfrequencies. The ability to fine tune the properties is explored.

Original languageEnglish (US)
Pages (from-to)689-695
Number of pages7
JournalMRS Advances
Issue number11-12
StatePublished - 2019


  • dielectric
  • dielectric properties
  • optical properties
  • sol-gel
  • thin film

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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