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

P J Skrdla¹, S S Saavedra, N R Armstrong

¹Department of Chemistry and Optical Sciences Center, University of Arizona, Tucson, Arizona 85721-0041.

Analytical Chemistry

|June 14, 2011

Summary

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A novel water vapor sensor uses a sol-gel film with erythrosin B dye integrated into a planar optical waveguide. This sensor offers rapid, real-time detection of humidity changes.

Area of Science:

Materials Science
Optical Engineering
Chemical Sensing

Background:

Sol-gel processing enables the creation of thin films with controlled properties.
Planar optical waveguides offer a platform for integrated optical sensing.
Erythrosin B dye exhibits changes in absorbance in response to water presence.

Purpose of the Study:

To develop a water vapor sensor by combining sol-gel technology and planar optical waveguides.
To investigate the sensing capabilities of erythrosin B dye immobilized in a sol-gel matrix.
To evaluate the sensor's performance for real-time humidity monitoring.

Main Methods:

Sol-gel films were prepared using methyltriethoxysilane, dimethyldiethoxysilane, and tetraethoxysilane.
The indicator dye erythrosin B was entrapped within a thin sol-gel film (approximately 100 nm thick).

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The dye-doped sol-gel layer was deposited onto a single-mode planar waveguide, and outcoupled light intensity was measured at 514.5 nm.

Main Results:

The sensor demonstrated a measurable response to water vapor across a wide relative humidity range (<1% to approximately 70%) at room temperature.
The dye's absorbance increased in the presence of water, which was detected via changes in outcoupled light intensity.
Both response and reversal times were found to be less than one minute.

Conclusions:

The developed sensor effectively detects water vapor using sol-gel and optical waveguide technologies.
The rapid response and reversal times suggest suitability for real-time monitoring applications.
This integrated approach offers a promising pathway for advanced humidity sensing devices.