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Updated: Jun 13, 2026

Fast and Accurate Exhaled Breath Ammonia Measurement

Fast and Accurate Exhaled Breath Ammonia Measurement

Published on: June 11, 2014

Diffractive optic sensor for remote-point detection of ammonia.

M Vasileiadis¹, L Athanasekos, A Meristoudi

¹Department of Materials Science, University of Patras, Patras 26 504, Greece. vasileiadis@upatras.gr

|May 4, 2010

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New photonic sensors detect ammonia using nickel chloride nanocrystals in silica. These remote-point sensors show a strong response to ammonia at 2 ppm, offering rapid detection for environmental monitoring.

Area of Science:

Materials Science
Nanotechnology
Chemical Sensing

Background:

Nanocomposite thin films offer unique optical properties.
Sol-gel silica matrices provide a stable platform for embedded nanocrystals.
Photonic sensors are crucial for real-time environmental analysis.

Purpose of the Study:

To fabricate and evaluate remote-point photonic sensors.
To investigate the use of NiCl(2) nanocrystals in a sol-gel silica matrix.
To demonstrate ammonia detection using UV laser-patterned surface relief structures.

Main Methods:

Fabrication of nanocomposite thin films with NiCl(2) nanocrystals.
Patterning of thin films using direct UV laser microetching.
Optical diffraction analysis of sensor response to ammonia exposure.

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Last Updated: Jun 13, 2026

Fast and Accurate Exhaled Breath Ammonia Measurement

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Published on: June 11, 2014

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Main Results:

Surface relief structures exhibiting environment-sensitive optical diffraction were created.
A strong ammonia detection response was observed via changes in diffraction efficiency.
Detection of ammonia at 2 ppm with a 30-second response time was achieved under ambient conditions.

Conclusions:

The developed photonic sensors effectively detect ammonia.
UV laser microetching is a viable technique for fabricating sensitive photonic devices.
These sensors show promise for remote-point environmental ammonia monitoring.