Sol-gel-based, planar waveguide sensor for water vapor

Peter J. Skrdla, Steven S Saavedra, Neal R Armstrong, Sergio B. Mendes, Nasser N Peyghambarian

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

A water vapor sensor based on a combination of sol-gel processing and planar optical waveguide technologies has been developed. The indicator erythrosin B was entrapped in a thin sol-gel film (thickness ~100 nm) prepared from methyltriethoxysilane, dimethyldiethoxysilane, and tetraethoxysilane. This dye exhibits an increase in absorbance in the presence of liquid or gaseous water. The sol-gel layer containing the dye was deposited onto a sol-gel-derived, single-mode planar waveguide. Outcoupled light intensity measurements (at 514.5 nm) over a range of water vapor concentrations (in a nitrogen gas stream) yielded a response over a wide range of relative humidity (<1-~70%) at room temperature. Response and reversal times were less than 1 min, which may make this sensor attractive for real-time monitoring applications.

Original languageEnglish (US)
Pages (from-to)1332-1337
Number of pages6
JournalAnalytical Chemistry
Volume71
Issue number7
DOIs
StatePublished - Apr 1 1999

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Planar waveguides
Steam
Sol-gels
Sensors
Coloring Agents
Erythrosine
Optical waveguides
Film thickness
Atmospheric humidity
Nitrogen
Gases
Water
Monitoring
Liquids
Processing
Temperature

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Sol-gel-based, planar waveguide sensor for water vapor. / Skrdla, Peter J.; Saavedra, Steven S; Armstrong, Neal R; Mendes, Sergio B.; Peyghambarian, Nasser N.

In: Analytical Chemistry, Vol. 71, No. 7, 01.04.1999, p. 1332-1337.

Research output: Contribution to journalArticle

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