Effects of pre-aging and concentration of surface modifying agent on the microstructure and dielectric properties of SiO2 xerogel film

Jung Ho Kim, Sang Bae Jung, Hyung-Ho Park, Sang Hoon Hyun

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Surface modification is a key process for the preparation of porous SiO2 xerogel film by ambient pressure drying. The microstructure and surface terminal bonds which determine the properties of the film are closely related with the surface modification. Two kinds of pre-aged film were prepared to investigate the effect of wet-gel microstructure on the surface modification of film. The concentration of surface modifying agent (tetramethylchlorosilane; TMCS) in solvent (n-hexane) was also varied. As concentration of TMCS increased, surface morphology was obtained from a two-dimensional structure to a three-dimensional network structure with pre-aged film for 1 h at 70 °C. This is due to the increase in methyl groups as surface terminal bonds and the suppression of condensation reaction. Variation in film thickness, porosity, dielectric constants, and I-E characteristic according to the TMCS concentration in n-hexane modifying solution was explained in the view-point of the nature of wet-gel structure. However, because of the additional increase in the strength of network and the effective exchange of surface terminal -OH groups with -OSi(CH3)3 groups even with low concentration of TMCS, there were no serious changes in the properties of SiO2 xerogel film pre-aged for 12 h at 70 °C.

Original languageEnglish
Pages (from-to)467-472
Number of pages6
JournalThin Solid Films
Volume377-378
DOIs
Publication statusPublished - 2000 Dec 1

Fingerprint

Xerogels
xerogels
Dielectric properties
dielectric properties
Aging of materials
microstructure
Microstructure
Surface treatment
Hexane
Gels
Condensation reactions
gels
Surface morphology
Film thickness
Drying
Permittivity
Porosity
drying
low concentrations
film thickness

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "Surface modification is a key process for the preparation of porous SiO2 xerogel film by ambient pressure drying. The microstructure and surface terminal bonds which determine the properties of the film are closely related with the surface modification. Two kinds of pre-aged film were prepared to investigate the effect of wet-gel microstructure on the surface modification of film. The concentration of surface modifying agent (tetramethylchlorosilane; TMCS) in solvent (n-hexane) was also varied. As concentration of TMCS increased, surface morphology was obtained from a two-dimensional structure to a three-dimensional network structure with pre-aged film for 1 h at 70 °C. This is due to the increase in methyl groups as surface terminal bonds and the suppression of condensation reaction. Variation in film thickness, porosity, dielectric constants, and I-E characteristic according to the TMCS concentration in n-hexane modifying solution was explained in the view-point of the nature of wet-gel structure. However, because of the additional increase in the strength of network and the effective exchange of surface terminal -OH groups with -OSi(CH3)3 groups even with low concentration of TMCS, there were no serious changes in the properties of SiO2 xerogel film pre-aged for 12 h at 70 °C.",
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Effects of pre-aging and concentration of surface modifying agent on the microstructure and dielectric properties of SiO2 xerogel film. / Kim, Jung Ho; Jung, Sang Bae; Park, Hyung-Ho; Hyun, Sang Hoon.

In: Thin Solid Films, Vol. 377-378, 01.12.2000, p. 467-472.

Research output: Contribution to journalArticle

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